Update DownloadCenterOperation.cs

增加cache file system单元测试

Assets/YooAsset/Runtime/Assembly/AssemblyInfo.cs

@@ -2,6 +2,7 @@
 
 // 内部友元
 [assembly: InternalsVisibleTo("YooAsset.Editor")]
+[assembly: InternalsVisibleTo("YooAsset.Test")]
 [assembly: InternalsVisibleTo("YooAsset.Test.Editor")]
 
 // 外部友元

Assets/YooAsset/Runtime/DownloadSystem/DownloadDefine.cs

@@ -94,4 +94,25 @@ namespace YooAsset
         /// </summary>
         public long FileSize;
     }
+
+    /// <summary>
+    /// 导入文件的信息
+    /// </summary>
+    public struct ImportFileInfo
+    {
+        /// <summary>
+        /// 本地文件路径
+        /// </summary>
+        public string FilePath;
+
+        /// <summary>
+        /// 资源包名称
+        /// </summary>
+        public string BundleName;
+
+        /// <summary>
+        /// 资源包GUID
+        /// </summary>
+        public string BundleGUID;
+    }
 }

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityAssetBundleRequestOperation.cs

@@ -1,16 +1,32 @@
-using UnityEngine;
+using UnityEngine.Networking;
-using UnityEngine.Networking;
+using UnityEngine;
 
 namespace YooAsset
 {
-    internal class DownloadWebNormalAssetBundleOperation : DownloadAssetBundleOperation
+    internal class UnityAssetBundleRequestOperation : UnityWebRequestOperation
     {
-        private readonly bool _disableUnityWebCache;
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            Done,
+        }
+
+        private UnityWebRequestAsyncOperation _requestOperation;
         private DownloadHandlerAssetBundle _downloadhandler;
+        private readonly PackageBundle _packageBundle;
+        private readonly bool _disableUnityWebCache;
         private ESteps _steps = ESteps.None;
 
-        internal DownloadWebNormalAssetBundleOperation(bool disableUnityWebCache, PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
+        /// <summary>
+        /// 请求结果
+        /// </summary>
+        public AssetBundle Result { private set; get; }
+
+        internal UnityAssetBundleRequestOperation(PackageBundle packageBundle, bool disableUnityWebCache, string url) : base(url)
         {
+            _packageBundle = packageBundle;
             _disableUnityWebCache = disableUnityWebCache;
         }
         internal override void InternalStart()
@@ -22,34 +38,20 @@ namespace YooAsset
             if (_steps == ESteps.None || _steps == ESteps.Done)
                 return;
 
-            // 创建下载器
             if (_steps == ESteps.CreateRequest)
             {
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
-                // 重置变量
-                ResetRequestFiled();
-
-                // 创建下载器
                 CreateWebRequest();
-
+                _steps = ESteps.Download;
-                _steps = ESteps.CheckRequest;
             }
 
-            // 检测下载结果
+            if (_steps == ESteps.Download)
-            if (_steps == ESteps.CheckRequest)
             {
                 DownloadProgress = _webRequest.downloadProgress;
                 DownloadedBytes = (long)_webRequest.downloadedBytes;
-                Progress = DownloadProgress;
+                Progress = _requestOperation.progress;
-                if (_webRequest.isDone == false)
+                if (_requestOperation.isDone == false)
-                {
-                    CheckRequestTimeout();
                     return;
-                }
 
-                // 检查网络错误
                 if (CheckRequestResult())
                 {
                     AssetBundle assetBundle = _downloadhandler.assetBundle;
@@ -57,7 +59,7 @@ namespace YooAsset
                     {
                         _steps = ESteps.Done;
                         Status = EOperationStatus.Failed;
-                        Error = "Download handler asset bundle object is null !";
+                        Error = $"URL : {_requestURL} Download handler asset bundle object is null !";
                     }
                     else
                     {
@@ -68,37 +70,13 @@ namespace YooAsset
                 }
                 else
                 {
-                    _steps = ESteps.TryAgain;
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
                 }
 
                 // 注意：最终释放请求器
-                DisposeWebRequest();
+                DisposeRequest();
             }
-
-            // 重新尝试下载
-            if (_steps == ESteps.TryAgain)
-            {
-                if (FailedTryAgain <= 0)
-                {
-                    Status = EOperationStatus.Failed;
-                    _steps = ESteps.Done;
-                    YooLogger.Error(Error);
-                    return;
-                }
-
-                _tryAgainTimer += Time.unscaledDeltaTime;
-                if (_tryAgainTimer > 1f)
-                {
-                    FailedTryAgain--;
-                    _steps = ESteps.CreateRequest;
-                    YooLogger.Warning(Error);
-                }
-            }
-        }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeWebRequest();
         }
 
         private void CreateWebRequest()
@@ -107,22 +85,13 @@ namespace YooAsset
             _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
             _webRequest.downloadHandler = _downloadhandler;
             _webRequest.disposeDownloadHandlerOnDispose = true;
-            _webRequest.SendWebRequest();
+            _requestOperation = _webRequest.SendWebRequest();
-        }
-        private void DisposeWebRequest()
-        {
-            if (_webRequest != null)
-            {
-                //注意：引擎底层会自动调用Abort方法
-                _webRequest.Dispose();
-                _webRequest = null;
-            }
         }
         private DownloadHandlerAssetBundle CreateWebDownloadHandler()
         {
             if (_disableUnityWebCache)
             {
-                var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, Bundle.UnityCRC);
+                var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, _packageBundle.UnityCRC);
 #if UNITY_2020_3_OR_NEWER
                 downloadhandler.autoLoadAssetBundle = false;
 #endif
@@ -132,8 +101,8 @@ namespace YooAsset
             {
                 // 注意：优先从浏览器缓存里获取文件
                 // The file hash defining the version of the asset bundle.
-                Hash128 fileHash = Hash128.Parse(Bundle.FileHash);
+                Hash128 fileHash = Hash128.Parse(_packageBundle.FileHash);
-                var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, fileHash, Bundle.UnityCRC);
+                var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, fileHash, _packageBundle.UnityCRC);
 #if UNITY_2020_3_OR_NEWER
                 downloadhandler.autoLoadAssetBundle = false;
 #endif

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityAssetBundleRequestOperation.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 8088863fc7dfbd441bc897380cd7b97f
+guid: e01cc308d7179a34281087fafe455b42
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityWebCacheRequestOperation.cs

@@ -0,0 +1,77 @@
+using UnityEngine.Networking;
+using UnityEngine;
+
+namespace YooAsset
+{
+    internal class UnityWebCacheRequestOperation : UnityWebRequestOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            Done,
+        }
+
+        private UnityWebRequestAsyncOperation _requestOperation;
+        private ESteps _steps = ESteps.None;
+
+
+        internal UnityWebCacheRequestOperation(string url) : base(url)
+        {
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            if (_steps == ESteps.CreateRequest)
+            {
+                CreateWebRequest();
+                _steps = ESteps.Download;
+            }
+
+            if (_steps == ESteps.Download)
+            {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
+                Progress = _requestOperation.progress;
+                if (_requestOperation.isDone == false)
+                    return;
+
+                if (CheckRequestResult())
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                }
+
+                // 注意：最终释放请求器
+                DisposeRequest();
+            }
+        }
+
+        /// <summary>
+        /// 设置请求头信息
+        /// </summary>
+        public void SetRequestHeader(string name, string value)
+        {
+            _webRequest.SetRequestHeader(name, value);
+        }
+
+        private void CreateWebRequest()
+        {
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.disposeDownloadHandlerOnDispose = true;
+            _requestOperation = _webRequest.SendWebRequest();
+        }
+    }
+}

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityWebCacheRequestOperation.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 94254ab8e4496214884c11a891c131c6
+guid: 375d88bcf5b9a6146adaf98ceb5369f8
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityWebDataRequestOperation.cs

@@ -5,7 +5,23 @@ namespace YooAsset
 {
     internal class UnityWebDataRequestOperation : UnityWebRequestOperation
     {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            Done,
+        }
+
         private UnityWebRequestAsyncOperation _requestOperation;
+        private ESteps _steps = ESteps.None;
+
+        /// <summary>
+        /// 响应的超时时间（单位：秒），在经过Timeout的秒数后尝试中止。
+        /// 注意：当Timeout设置为0时，不会应用超时。
+        /// 注意：设置的超时值可能应用于Android上的每个URL重定向，这可能会导致响应时间增加。
+        /// </summary>
+        private readonly int _timeout;
 
         /// <summary>
         /// 请求结果
@@ -13,8 +29,9 @@ namespace YooAsset
         public byte[] Result { private set; get; }
 
 
-        internal UnityWebDataRequestOperation(string url, int timeout = 60) : base(url, timeout)
+        internal UnityWebDataRequestOperation(string url, int timeout) : base(url)
         {
+            _timeout = timeout;
         }
         internal override void InternalStart()
         {
@@ -27,28 +44,34 @@ namespace YooAsset
 
             if (_steps == ESteps.CreateRequest)
             {
-                _latestDownloadBytes = 0;
-                _latestDownloadRealtime = Time.realtimeSinceStartup;
-
                 CreateWebRequest();
                 _steps = ESteps.Download;
             }
 
             if (_steps == ESteps.Download)
             {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
                 Progress = _requestOperation.progress;
                 if (_requestOperation.isDone == false)
-                {
-                    CheckRequestTimeout();
                     return;
-                }
 
                 if (CheckRequestResult())
+                {
+                    var fileData = _webRequest.downloadHandler.data;
+                    if (fileData == null || fileData.Length == 0)
                     {
                         _steps = ESteps.Done;
-                    Result = _webRequest.downloadHandler.data;
+                        Status = EOperationStatus.Failed;
+                        Error = $"URL : {_requestURL} Download handler data is null or empty !";
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Result = fileData;
                         Status = EOperationStatus.Succeed;
                     }
+                }
                 else
                 {
                     _steps = ESteps.Done;
@@ -59,16 +82,12 @@ namespace YooAsset
                 DisposeRequest();
             }
         }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeRequest();
-        }
 
         private void CreateWebRequest()
         {
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
             DownloadHandlerBuffer handler = new DownloadHandlerBuffer();
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.timeout = _timeout;
             _webRequest.downloadHandler = handler;
             _webRequest.disposeDownloadHandlerOnDispose = true;
             _requestOperation = _webRequest.SendWebRequest();

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityWebFileRequestOperation.cs

@@ -5,12 +5,30 @@ namespace YooAsset
 {
     internal class UnityWebFileRequestOperation : UnityWebRequestOperation
     {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            Done,
+        }
+
         private UnityWebRequestAsyncOperation _requestOperation;
         private readonly string _fileSavePath;
+        private ESteps _steps = ESteps.None;
 
-        internal UnityWebFileRequestOperation(string url, string fileSavePath, int timeout = 60) : base(url, timeout)
+        /// <summary>
+        /// 响应的超时时间（单位：秒），在经过Timeout的秒数后尝试中止。
+        /// 注意：当Timeout设置为0时，不会应用超时。
+        /// 注意：设置的超时值可能应用于Android上的每个URL重定向，这可能会导致响应时间增加。
+        /// </summary>
+        private readonly int _timeout;
+
+
+        internal UnityWebFileRequestOperation(string url, string fileSavePath, int timeout) : base(url)
         {
             _fileSavePath = fileSavePath;
+            _timeout = timeout;
         }
         internal override void InternalStart()
         {
@@ -23,21 +41,17 @@ namespace YooAsset
 
             if (_steps == ESteps.CreateRequest)
             {
-                _latestDownloadBytes = 0;
-                _latestDownloadRealtime = Time.realtimeSinceStartup;
-
                 CreateWebRequest();
                 _steps = ESteps.Download;
             }
 
             if (_steps == ESteps.Download)
             {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
                 Progress = _requestOperation.progress;
                 if (_requestOperation.isDone == false)
-                {
-                    CheckRequestTimeout();
                     return;
-                }
 
                 if (CheckRequestResult())
                 {
@@ -54,17 +68,13 @@ namespace YooAsset
                 DisposeRequest();
             }
         }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeRequest();
-        }
 
         private void CreateWebRequest()
         {
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
             DownloadHandlerFile handler = new DownloadHandlerFile(_fileSavePath);
             handler.removeFileOnAbort = true;
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.timeout = _timeout;
             _webRequest.downloadHandler = handler;
             _webRequest.disposeDownloadHandlerOnDispose = true;
             _requestOperation = _webRequest.SendWebRequest();

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityWebRequestOperation.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Collections;
-using System.Collections.Concurrent;
 using UnityEngine.Networking;
 using UnityEngine;
 
@@ -8,33 +6,50 @@ namespace YooAsset
 {
     internal abstract class UnityWebRequestOperation : AsyncOperationBase
     {
-        protected enum ESteps
-        {
-            None,
-            CreateRequest,
-            Download,
-            Done,
-        }
-
         protected UnityWebRequest _webRequest;
         protected readonly string _requestURL;
-        protected ESteps _steps = ESteps.None;
-
-        // 超时相关
-        protected readonly float _timeout;
-        protected ulong _latestDownloadBytes;
-        protected float _latestDownloadRealtime;
         private bool _isAbort = false;
 
+        /// <summary>
+        /// HTTP返回码
+        /// </summary>
+        public long HttpCode { private set; get; }
+
+        /// <summary>
+        /// 当前下载的字节数
+        /// </summary>
+        public long DownloadedBytes { protected set; get; }
+
+        /// <summary>
+        /// 当前下载进度（0f - 1f）
+        /// </summary>
+        public float DownloadProgress { protected set; get; }
+
+        /// <summary>
+        /// 请求的URL地址
+        /// </summary>
         public string URL
         {
             get { return _requestURL; }
         }
 
-        internal UnityWebRequestOperation(string url, int timeout)
+        internal UnityWebRequestOperation(string url)
         {
             _requestURL = url;
-            _timeout = timeout;
+        }
+        internal override void InternalAbort()
+        {
+            //TODO
+            // 1. 编辑器下停止运行游戏的时候主动终止下载任务
+            // 2. 真机上销毁包裹的时候主动终止下载任务
+            if (_isAbort == false)
+            {
+                if (_webRequest != null)
+                {
+                    _webRequest.Abort();
+                    _isAbort = true;
+                }
+            }
         }
 
         /// <summary>
@@ -44,39 +59,19 @@ namespace YooAsset
         {
             if (_webRequest != null)
             {
+                //注意：引擎底层会自动调用Abort方法
                 _webRequest.Dispose();
                 _webRequest = null;
             }
         }
 
-        /// <summary>
-        /// 检测超时
-        /// </summary>
-        protected void CheckRequestTimeout()
-        {
-            // 注意：在连续时间段内无新增下载数据及判定为超时
-            if (_isAbort == false)
-            {
-                if ( _latestDownloadBytes != _webRequest.downloadedBytes)
-                {
-                    _latestDownloadBytes = _webRequest.downloadedBytes;
-                    _latestDownloadRealtime = Time.realtimeSinceStartup;
-                }
-
-                float offset = Time.realtimeSinceStartup - _latestDownloadRealtime;
-                if (offset > _timeout)
-                {
-                    _webRequest.Abort();
-                    _isAbort = true;
-                }
-            }
-        }
-
         /// <summary>
         /// 检测请求结果
         /// </summary>
         protected bool CheckRequestResult()
         {
+            HttpCode = _webRequest.responseCode;
+
 #if UNITY_2020_3_OR_NEWER
             if (_webRequest.result != UnityWebRequest.Result.Success)
             {

Assets/YooAsset/Runtime/DownloadSystem/Operation/Internal/UnityWebTextRequestOperation.cs

@@ -5,7 +5,23 @@ namespace YooAsset
 {
     internal class UnityWebTextRequestOperation : UnityWebRequestOperation
     {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            Done,
+        }
+
         private UnityWebRequestAsyncOperation _requestOperation;
+        private ESteps _steps = ESteps.None;
+
+        /// <summary>
+        /// 响应的超时时间（单位：秒），在经过Timeout的秒数后尝试中止。
+        /// 注意：当Timeout设置为0时，不会应用超时。
+        /// 注意：设置的超时值可能应用于Android上的每个URL重定向，这可能会导致响应时间增加。
+        /// </summary>
+        private readonly int _timeout;
 
         /// <summary>
         /// 请求结果
@@ -13,8 +29,9 @@ namespace YooAsset
         public string Result { private set; get; }
 
 
-        internal UnityWebTextRequestOperation(string url, int timeout = 60) : base(url, timeout)
+        internal UnityWebTextRequestOperation(string url, int timeout) : base(url)
         {
+            _timeout = timeout;
         }
         internal override void InternalStart()
         {
@@ -27,28 +44,34 @@ namespace YooAsset
 
             if (_steps == ESteps.CreateRequest)
             {
-                _latestDownloadBytes = 0;
-                _latestDownloadRealtime = Time.realtimeSinceStartup;
-
                 CreateWebRequest();
                 _steps = ESteps.Download;
             }
 
             if (_steps == ESteps.Download)
             {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
                 Progress = _requestOperation.progress;
                 if (_requestOperation.isDone == false)
-                {
-                    CheckRequestTimeout();
                     return;
-                }
 
                 if (CheckRequestResult())
+                {
+                    var fileText = _webRequest.downloadHandler.text;
+                    if (string.IsNullOrEmpty(fileText))
                     {
                         _steps = ESteps.Done;
-                    Result = _webRequest.downloadHandler.text;
+                        Status = EOperationStatus.Failed;
+                        Error = $"URL : {_requestURL} Download handler text is null or empty !";
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Result = fileText;
                         Status = EOperationStatus.Succeed;
                     }
+                }
                 else
                 {
                     _steps = ESteps.Done;
@@ -59,16 +82,12 @@ namespace YooAsset
                 DisposeRequest();
             }
         }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeRequest();
-        }
 
         private void CreateWebRequest()
         {
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
             DownloadHandlerBuffer handler = new DownloadHandlerBuffer();
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.timeout = _timeout;
             _webRequest.downloadHandler = handler;
             _webRequest.disposeDownloadHandlerOnDispose = true;
             _requestOperation = _webRequest.SendWebRequest();

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/DefaultBuildinFileSystem.cs

@@ -125,7 +125,7 @@ namespace YooAsset
         }
         public virtual FSDownloadFileOperation DownloadFileAsync(PackageBundle bundle, DownloadFileOptions options)
         {
-            // 注意：业务层的解压下载器会依赖内置文件系统的下载方法
+            // 注意：业务层的解压器会依赖该方法
             options.ImportFilePath = GetBuildinFileLoadPath(bundle);
             return _unpackFileSystem.DownloadFileAsync(bundle, options);
         }

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/DefaultBuildinFileSystemBuild.cs

@@ -49,13 +49,13 @@ namespace YooAsset
         /// <summary>
         /// 生成包裹的内置资源目录文件
         /// </summary>
-        public static bool CreateBuildinCatalogFile(IManifestServices services, string packageName, string pacakgeDirectory)
+        public static bool CreateBuildinCatalogFile(IManifestServices services, string packageName, string packageDirectory)
         {
             // 获取资源清单版本
             string packageVersion;
             {
                 string versionFileName = YooAssetSettingsData.GetPackageVersionFileName(packageName);
-                string versionFilePath = $"{pacakgeDirectory}/{versionFileName}";
+                string versionFilePath = $"{packageDirectory}/{versionFileName}";
                 if (File.Exists(versionFilePath) == false)
                 {
                     Debug.LogError($"Can not found package version file : {versionFilePath}");
@@ -69,7 +69,7 @@ namespace YooAsset
             PackageManifest packageManifest;
             {
                 string manifestFileName = YooAssetSettingsData.GetManifestBinaryFileName(packageName, packageVersion);
-                string manifestFilePath = $"{pacakgeDirectory}/{manifestFileName}";
+                string manifestFilePath = $"{packageDirectory}/{manifestFileName}";
                 if (File.Exists(manifestFilePath) == false)
                 {
                     Debug.LogError($"Can not found package manifest file : {manifestFilePath}");
@@ -110,7 +110,7 @@ namespace YooAsset
             };
 
             // 记录所有内置资源文件
-            DirectoryInfo rootDirectory = new DirectoryInfo(pacakgeDirectory);
+            DirectoryInfo rootDirectory = new DirectoryInfo(packageDirectory);
             FileInfo[] fileInfos = rootDirectory.GetFiles();
             foreach (var fileInfo in fileInfos)
             {
@@ -135,13 +135,13 @@ namespace YooAsset
             }
 
             // 创建输出文件
-            string jsonFilePath = $"{pacakgeDirectory}/{DefaultBuildinFileSystemDefine.BuildinCatalogJsonFileName}";
+            string jsonFilePath = $"{packageDirectory}/{DefaultBuildinFileSystemDefine.BuildinCatalogJsonFileName}";
             if (File.Exists(jsonFilePath))
                 File.Delete(jsonFilePath);
             CatalogTools.SerializeToJson(jsonFilePath, buildinFileCatalog);
 
             // 创建输出文件
-            string binaryFilePath = $"{pacakgeDirectory}/{DefaultBuildinFileSystemDefine.BuildinCatalogBinaryFileName}";
+            string binaryFilePath = $"{packageDirectory}/{DefaultBuildinFileSystemDefine.BuildinCatalogBinaryFileName}";
             if (File.Exists(binaryFilePath))
                 File.Delete(binaryFilePath);
             CatalogTools.SerializeToBinary(binaryFilePath, buildinFileCatalog);

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/Operation/DBFSInitializeOperation.cs

@@ -17,7 +17,7 @@ namespace YooAsset
         private readonly DefaultBuildinFileSystem _fileSystem;
         private CopyBuildinPackageManifestOperation _copyBuildinPackageManifestOp;
         private FSInitializeFileSystemOperation _initUnpackFIleSystemOp;
-        private LoadBuildinCatalogFileOperation _loadCatalogFileOp;
+        private LoadBuildinCatalogFileOperation _loadBuildinCatalogFileOp;
         private ESteps _steps = ESteps.None;
 
         internal DBFSInitializeOperation(DefaultBuildinFileSystem fileSystem)
@@ -103,34 +103,18 @@ namespace YooAsset
 
             if (_steps == ESteps.LoadCatalogFile)
             {
-                if (_loadCatalogFileOp == null)
+                if (_loadBuildinCatalogFileOp == null)
                 {
-#if UNITY_EDITOR
+                    _loadBuildinCatalogFileOp = new LoadBuildinCatalogFileOperation(_fileSystem);
-                    /*
+                    _loadBuildinCatalogFileOp.StartOperation();
-                    // 兼容性初始化
+                    AddChildOperation(_loadBuildinCatalogFileOp);
-                    // 说明：内置文件系统在编辑器下运行时需要动态生成
-                    string packageRoot = _fileSystem.FileRoot;
-                    bool result = DefaultBuildinFileSystemBuild.CreateBuildinCatalogFile(_fileSystem.ManifestServices, _fileSystem.PackageName, packageRoot);
-                    if (result == false)
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = $"Create package catalog file failed ! See the detail error in console !";
-                        return;
-                    }
-                    */
-#endif
-
-                    _loadCatalogFileOp = new LoadBuildinCatalogFileOperation(_fileSystem);
-                    _loadCatalogFileOp.StartOperation();
-                    AddChildOperation(_loadCatalogFileOp);
                 }
 
-                _loadCatalogFileOp.UpdateOperation();
+                _loadBuildinCatalogFileOp.UpdateOperation();
-                if (_loadCatalogFileOp.IsDone == false)
+                if (_loadBuildinCatalogFileOp.IsDone == false)
                     return;
 
-                if (_loadCatalogFileOp.Status == EOperationStatus.Succeed)
+                if (_loadBuildinCatalogFileOp.Status == EOperationStatus.Succeed)
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Succeed;
@@ -139,7 +123,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _loadCatalogFileOp.Error;
+                    Error = _loadBuildinCatalogFileOp.Error;
                 }
             }
         }

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/Operation/DBFSLoadBundleOperation.cs

@@ -104,14 +104,8 @@ namespace YooAsset
                     }
                 }
 
-                if (_assetBundle != null)
+                if (_assetBundle == null)
                 {
-                    _steps = ESteps.Done;
-                    Result = new AssetBundleResult(_fileSystem, _bundle, _assetBundle, _managedStream);
-                    Status = EOperationStatus.Succeed;
-                    return;
-                }
-
                     if (_bundle.Encrypted)
                     {
                         _steps = ESteps.Done;
@@ -127,6 +121,13 @@ namespace YooAsset
                         YooLogger.Error(Error);
                     }
                 }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Result = new AssetBundleResult(_fileSystem, _bundle, _assetBundle, _managedStream);
+                    Status = EOperationStatus.Succeed;
+                }
+            }
         }
         internal override void InternalWaitForAsyncComplete()
         {
@@ -176,13 +177,15 @@ namespace YooAsset
 
             if (_steps == ESteps.LoadBuildinRawBundle)
             {
+                string filePath = _fileSystem.GetBuildinFileLoadPath(_bundle);
+
 #if UNITY_ANDROID
                 //TODO : 安卓平台内置文件属于APK压缩包内的文件。
                 _steps = ESteps.Done;
-                Result = new RawBundleResult(_fileSystem, _bundle);
+                Status = EOperationStatus.Failed;
-                Status = EOperationStatus.Succeed;
+                Error = $"Can not load android buildin raw bundle file : {filePath}";
+                YooLogger.Error(Error);
 #else
-                string filePath = _fileSystem.GetBuildinFileLoadPath(_bundle);
                 if (File.Exists(filePath))
                 {
                     _steps = ESteps.Done;

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/Operation/internal/CopyBuildinPackageManifestOperation.cs

@@ -20,8 +20,8 @@ namespace YooAsset
 
         private readonly DefaultBuildinFileSystem _fileSystem;
         private RequestBuildinPackageVersionOperation _requestBuildinPackageVersionOp;
-        private UnityWebFileRequestOperation _hashFileRequestOp;
+        private UnityWebFileRequestOperation _hashWebFileRequestOp;
-        private UnityWebFileRequestOperation _manifestFileRequestOp;
+        private UnityWebFileRequestOperation _manifestWebFileRequestOp;
         private string _buildinPackageVersion;
         private ESteps _steps = ESteps.None;
 
@@ -78,21 +78,21 @@ namespace YooAsset
 
             if (_steps == ESteps.UnpackHashFile)
             {
-                if (_hashFileRequestOp == null)
+                if (_hashWebFileRequestOp == null)
                 {
                     string sourcePath = _fileSystem.GetBuildinPackageHashFilePath(_buildinPackageVersion);
                     string destPath = GetCopyPackageHashDestPath(_buildinPackageVersion);
                     string url = DownloadSystemHelper.ConvertToWWWPath(sourcePath);
-                    _hashFileRequestOp = new UnityWebFileRequestOperation(url, destPath);
+                    _hashWebFileRequestOp = new UnityWebFileRequestOperation(url, destPath, 60);
-                    _hashFileRequestOp.StartOperation();
+                    _hashWebFileRequestOp.StartOperation();
-                    AddChildOperation(_hashFileRequestOp);
+                    AddChildOperation(_hashWebFileRequestOp);
                 }
 
-                _hashFileRequestOp.UpdateOperation();
+                _hashWebFileRequestOp.UpdateOperation();
-                if (_hashFileRequestOp.IsDone == false)
+                if (_hashWebFileRequestOp.IsDone == false)
                     return;
 
-                if (_hashFileRequestOp.Status == EOperationStatus.Succeed)
+                if (_hashWebFileRequestOp.Status == EOperationStatus.Succeed)
                 {
                     _steps = ESteps.CheckManifestFile;
                 }
@@ -100,7 +100,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _hashFileRequestOp.Error;
+                    Error = _hashWebFileRequestOp.Error;
                 }
             }
 
@@ -119,21 +119,21 @@ namespace YooAsset
 
             if (_steps == ESteps.UnpackManifestFile)
             {
-                if (_manifestFileRequestOp == null)
+                if (_manifestWebFileRequestOp == null)
                 {
                     string sourcePath = _fileSystem.GetBuildinPackageManifestFilePath(_buildinPackageVersion);
                     string destPath = GetCopyPackageManifestDestPath(_buildinPackageVersion);
                     string url = DownloadSystemHelper.ConvertToWWWPath(sourcePath);
-                    _manifestFileRequestOp = new UnityWebFileRequestOperation(url, destPath);
+                    _manifestWebFileRequestOp = new UnityWebFileRequestOperation(url, destPath, 60);
-                    _manifestFileRequestOp.StartOperation();
+                    _manifestWebFileRequestOp.StartOperation();
-                    AddChildOperation(_manifestFileRequestOp);
+                    AddChildOperation(_manifestWebFileRequestOp);
                 }
 
-                _manifestFileRequestOp.UpdateOperation();
+                _manifestWebFileRequestOp.UpdateOperation();
-                if (_manifestFileRequestOp.IsDone == false)
+                if (_manifestWebFileRequestOp.IsDone == false)
                     return;
 
-                if (_manifestFileRequestOp.Status == EOperationStatus.Succeed)
+                if (_manifestWebFileRequestOp.Status == EOperationStatus.Succeed)
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Succeed;
@@ -142,7 +142,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _manifestFileRequestOp.Error;
+                    Error = _manifestWebFileRequestOp.Error;
                 }
             }
         }

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/Operation/internal/LoadBuildinCatalogFileOperation.cs

@@ -35,7 +35,7 @@ namespace YooAsset
                 {
                     string filePath = _fileSystem.GetCatalogBinaryFileLoadPath();
                     string url = DownloadSystemHelper.ConvertToWWWPath(filePath);
-                    _webDataRequestOp = new UnityWebDataRequestOperation(url);
+                    _webDataRequestOp = new UnityWebDataRequestOperation(url, 60);
                     _webDataRequestOp.StartOperation();
                     AddChildOperation(_webDataRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/Operation/internal/LoadBuildinPackageManifestOperation.cs

@@ -46,7 +46,7 @@ namespace YooAsset
                 {
                     string filePath = _fileSystem.GetBuildinPackageManifestFilePath(_packageVersion);
                     string url = DownloadSystemHelper.ConvertToWWWPath(filePath);
-                    _webDataRequestOp = new UnityWebDataRequestOperation(url);
+                    _webDataRequestOp = new UnityWebDataRequestOperation(url, 60);
                     _webDataRequestOp.StartOperation();
                     AddChildOperation(_webDataRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/Operation/internal/RequestBuildinPackageHashOperation.cs

@@ -41,7 +41,7 @@ namespace YooAsset
                 {
                     string filePath = _fileSystem.GetBuildinPackageHashFilePath(_packageVersion);
                     string url = DownloadSystemHelper.ConvertToWWWPath(filePath);
-                    _webTextRequestOp = new UnityWebTextRequestOperation(url);
+                    _webTextRequestOp = new UnityWebTextRequestOperation(url, 60);
                     _webTextRequestOp.StartOperation();
                     AddChildOperation(_webTextRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultBuildinFileSystem/Operation/internal/RequestBuildinPackageVersionOperation.cs

@@ -39,7 +39,7 @@ namespace YooAsset
                 {
                     string filePath = _fileSystem.GetBuildinPackageVersionFilePath();
                     string url = DownloadSystemHelper.ConvertToWWWPath(filePath);
-                    _webTextRequestOp = new UnityWebTextRequestOperation(url);
+                    _webTextRequestOp = new UnityWebTextRequestOperation(url, 60);
                     _webTextRequestOp.StartOperation();
                     AddChildOperation(_webTextRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/DefaultCacheFileSystem.cs

@@ -166,12 +166,23 @@ namespace YooAsset
         }
         public virtual FSDownloadFileOperation DownloadFileAsync(PackageBundle bundle, DownloadFileOptions options)
         {
-            var downloader = DownloadCenter.DownloadFileAsync(bundle, options);
+            // 获取下载地址
-            downloader.Reference(); //增加下载器的引用计数
+            if (string.IsNullOrEmpty(options.ImportFilePath))
+            {
+                // 注意：如果是解压文件系统类，这里会返回本地内置文件的下载路径
+                string mainURL = RemoteServices.GetRemoteMainURL(bundle.FileName);
+                string fallbackURL = RemoteServices.GetRemoteFallbackURL(bundle.FileName);
+                options.SetURL(mainURL, fallbackURL);
+            }
+            else
+            {
+                // 注意：把本地导入文件路径转换为下载器请求地址
+                string mainURL = DownloadSystemHelper.ConvertToWWWPath(options.ImportFilePath);
+                options.SetURL(mainURL, mainURL);
+            }
 
-            // 注意：将下载器进行包裹，可以避免父类任务终止的时候，连带子任务里的下载器也一起被终止！
+            var downloader = new DownloadPackageBundleOperation(this, bundle, options);
-            var wrapper = new DownloadFileWrapper(downloader);
+            return downloader;
-            return wrapper;
         }
         public virtual FSLoadBundleOperation LoadBundleFile(PackageBundle bundle)
         {

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSLoadBundleOperation.cs

@@ -55,10 +55,9 @@ namespace YooAsset
 
             if (_steps == ESteps.DownloadFile)
             {
-                // 注意：边玩边下下载器引用计数没有Release
                 if (_downloadFileOp == null)
                 {
-                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue, 60);
+                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue);
                     _downloadFileOp = _fileSystem.DownloadFileAsync(_bundle, options);
                     _downloadFileOp.StartOperation();
                     AddChildOperation(_downloadFileOp);
@@ -303,10 +302,9 @@ namespace YooAsset
 
             if (_steps == ESteps.DownloadFile)
             {
-                // 注意：边玩边下下载器引用计数没有Release
                 if (_downloadFileOp == null)
                 {
-                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue, 60);
+                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue);
                     _downloadFileOp = _fileSystem.DownloadFileAsync(_bundle, options);
                     _downloadFileOp.StartOperation();
                     AddChildOperation(_downloadFileOp);

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/DownloadCenterOperation.cs

@@ -6,8 +6,8 @@ namespace YooAsset
     internal class DownloadCenterOperation : AsyncOperationBase
     {
         private readonly DefaultCacheFileSystem _fileSystem;
-        protected readonly Dictionary<string, DefaultDownloadFileOperation> _downloaders = new Dictionary<string, DefaultDownloadFileOperation>(1000);
+        protected readonly Dictionary<string, UnityDownloadFileOperation> _downloaders = new Dictionary<string, UnityDownloadFileOperation>(1000);
-        protected readonly List<string> _removeDownloadList = new List<string>(1000);
+        protected readonly List<string> _removeList = new List<string>(1000);
 
         public DownloadCenterOperation(DefaultCacheFileSystem fileSystem)
         {
@@ -19,29 +19,28 @@ namespace YooAsset
         internal override void InternalUpdate()
         {
             // 获取可移除的下载器集合
-            _removeDownloadList.Clear();
+            _removeList.Clear();
             foreach (var valuePair in _downloaders)
             {
                 var downloader = valuePair.Value;
                 downloader.UpdateOperation();
+                if (downloader.IsDone)
+                {
+                    _removeList.Add(valuePair.Key);
+                    continue;
+                }
 
                 // 注意：主动终止引用计数为零的下载任务
                 if (downloader.RefCount <= 0)
                 {
-                    _removeDownloadList.Add(valuePair.Key);
+                    _removeList.Add(valuePair.Key);
                     downloader.AbortOperation();
                     continue;
                 }
-
-                if (downloader.IsDone)
-                {
-                    _removeDownloadList.Add(valuePair.Key);
-                    continue;
-                }
             }
 
             // 移除下载器
-            foreach (var key in _removeDownloadList)
+            foreach (var key in _removeList)
             {
                 _downloaders.Remove(key);
             }
@@ -74,34 +73,21 @@ namespace YooAsset
         /// <summary>
         /// 创建下载任务
         /// </summary>
-        public FSDownloadFileOperation DownloadFileAsync(PackageBundle bundle, DownloadFileOptions options)
+        public UnityDownloadFileOperation DownloadFileAsync(PackageBundle bundle, string url)
         {
             // 查询旧的下载器
             if (_downloaders.TryGetValue(bundle.BundleGUID, out var oldDownloader))
             {
+                oldDownloader.Reference();
                 return oldDownloader;
             }
 
-            // 获取下载地址
-            if (string.IsNullOrEmpty(options.ImportFilePath))
-            {
-                // 注意：如果是解压文件系统类，这里会返回本地内置文件的下载路径
-                options.MainURL = _fileSystem.RemoteServices.GetRemoteMainURL(bundle.FileName);
-                options.FallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(bundle.FileName);
-            }
-            else
-            {
-                // 注意：把本地导入文件路径转换为下载器请求地址
-                options.MainURL = DownloadSystemHelper.ConvertToWWWPath(options.ImportFilePath);
-                options.FallbackURL = options.MainURL;
-            }
-
             // 创建新的下载器
-            DefaultDownloadFileOperation newDownloader;
+            UnityDownloadFileOperation newDownloader;
-            bool isRequestLocalFile = DownloadSystemHelper.IsRequestLocalFile(options.MainURL);
+            bool isRequestLocalFile = DownloadSystemHelper.IsRequestLocalFile(url);
             if (isRequestLocalFile)
             {
-                newDownloader = new DownloadLocalFileOperation(_fileSystem, bundle, options);
+                newDownloader = new UnityDownloadLocalFileOperation(_fileSystem, bundle, url);
                 AddChildOperation(newDownloader);
                 _downloaders.Add(bundle.BundleGUID, newDownloader);
             }
@@ -109,17 +95,19 @@ namespace YooAsset
             {
                 if (bundle.FileSize >= _fileSystem.ResumeDownloadMinimumSize)
                 {
-                    newDownloader = new DownloadResumeFileOperation(_fileSystem, bundle, options);
+                    newDownloader = new UnityDownloadResumeFileOperation(_fileSystem, bundle, url);
                     AddChildOperation(newDownloader);
                     _downloaders.Add(bundle.BundleGUID, newDownloader);
                 }
                 else
                 {
-                    newDownloader = new DownloadNormalFileOperation(_fileSystem, bundle, options);
+                    newDownloader = new UnityDownloadNormalFileOperation(_fileSystem, bundle, url);
                     AddChildOperation(newDownloader);
                     _downloaders.Add(bundle.BundleGUID, newDownloader);
                 }
             }
+
+            newDownloader.Reference();
             return newDownloader;
         }
 

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/DownloadHandlerFileRange.cs

@@ -1,87 +0,0 @@
-using System;
-using System.IO;
-using UnityEngine;
-using UnityEngine.Networking;
-
-namespace YooAsset
-{
-    /// <summary>
-    /// 支持Unity2018版本的断点续传下载器
-    /// </summary>
-    internal class DownloadHandlerFileRange : DownloadHandlerScript
-    {
-        private string _fileSavePath;
-        private long _fileTotalSize;
-        private UnityWebRequest _webRequest;
-        private FileStream _fileStream;
-
-        private long _localFileSize = 0;
-        private long _curFileSize = 0;
-
-
-        public DownloadHandlerFileRange(string fileSavePath, long fileTotalSize, UnityWebRequest webRequest) : base(new byte[1024 * 1024])
-        {
-            _fileSavePath = fileSavePath;
-            _fileTotalSize = fileTotalSize;
-            _webRequest = webRequest;
-
-            if (File.Exists(fileSavePath))
-            {
-                FileInfo fileInfo = new FileInfo(fileSavePath);
-                _localFileSize = fileInfo.Length;
-            }
-
-            _fileStream = new FileStream(_fileSavePath, FileMode.Append, FileAccess.Write);
-            _curFileSize = _localFileSize;
-        }
-        protected override bool ReceiveData(byte[] data, int dataLength)
-        {
-            if (data == null || dataLength == 0 || _webRequest.responseCode >= 400)
-                return false;
-
-            if (_fileStream == null)
-                return false;
-
-            _fileStream.Write(data, 0, dataLength);
-            _curFileSize += dataLength;
-            return true;
-        }
-
-        /// <summary>
-        /// UnityWebRequest.downloadHandler.data
-        /// </summary>
-        protected override byte[] GetData()
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// UnityWebRequest.downloadHandler.text
-        /// </summary>
-        protected override string GetText()
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// UnityWebRequest.downloadProgress
-        /// </summary>
-        protected override float GetProgress()
-        {
-            return _fileTotalSize == 0 ? 0 : ((float)_curFileSize) / _fileTotalSize;
-        }
-
-        /// <summary>
-        /// 释放下载句柄
-        /// </summary>
-        public void Cleanup()
-        {
-            if (_fileStream != null)
-            {
-                _fileStream.Flush();
-                _fileStream.Dispose();
-                _fileStream = null;
-            }
-        }
-    }
-}

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/DownloadNormalFileOperation.cs

@@ -1,194 +0,0 @@
-using System.IO;
-using UnityEngine;
-using UnityEngine.Networking;
-
-namespace YooAsset
-{
-    internal sealed class DownloadNormalFileOperation : DefaultDownloadFileOperation
-    {
-        private readonly DefaultCacheFileSystem _fileSystem;
-        private VerifyTempFileOperation _verifyOperation;
-        private string _tempFilePath;
-        private ESteps _steps = ESteps.None;
-
-        internal DownloadNormalFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
-        {
-            _fileSystem = fileSystem;
-        }
-        internal override void InternalStart()
-        {
-            _tempFilePath = _fileSystem.GetTempFilePath(Bundle);
-            _steps = ESteps.CheckExists;
-        }
-        internal override void InternalUpdate()
-        {
-            if (_steps == ESteps.None || _steps == ESteps.Done)
-                return;
-
-            // 检测文件是否存在
-            if (_steps == ESteps.CheckExists)
-            {
-                if (_fileSystem.Exists(Bundle))
-                {
-                    _steps = ESteps.Done;
-                    Status = EOperationStatus.Succeed;
-                }
-                else
-                {
-                    _steps = ESteps.CreateRequest;
-                }
-            }
-
-            // 创建下载器
-            if (_steps == ESteps.CreateRequest)
-            {
-                FileUtility.CreateFileDirectory(_tempFilePath);
-
-                // 删除临时文件
-                if (File.Exists(_tempFilePath))
-                    File.Delete(_tempFilePath);
-
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
-                // 重置请求
-                ResetRequestFiled();
-
-                // 创建下载器
-                CreateWebRequest();
-
-                _steps = ESteps.CheckRequest;
-            }
-
-            // 检测下载结果
-            if (_steps == ESteps.CheckRequest)
-            {
-                DownloadProgress = _webRequest.downloadProgress;
-                DownloadedBytes = (long)_webRequest.downloadedBytes;
-                Progress = DownloadProgress;
-                if (_webRequest.isDone == false)
-                {
-                    CheckRequestTimeout();
-                    return;
-                }
-
-                // 检查网络错误
-                if (CheckRequestResult())
-                    _steps = ESteps.VerifyTempFile;
-                else
-                    _steps = ESteps.TryAgain;
-
-                // 注意：最终释放请求器
-                DisposeWebRequest();
-            }
-
-            // 验证下载文件
-            if (_steps == ESteps.VerifyTempFile)
-            {
-                var element = new TempFileElement(_tempFilePath, Bundle.FileCRC, Bundle.FileSize);
-                _verifyOperation = new VerifyTempFileOperation(element);
-                _verifyOperation.StartOperation();
-                AddChildOperation(_verifyOperation);
-                _steps = ESteps.CheckVerifyTempFile;
-            }
-
-            // 等待验证完成
-            if (_steps == ESteps.CheckVerifyTempFile)
-            {
-                if (IsWaitForAsyncComplete)
-                    _verifyOperation.WaitForAsyncComplete();
-
-                _verifyOperation.UpdateOperation();
-                if (_verifyOperation.IsDone == false)
-                    return;
-
-                if (_verifyOperation.Status == EOperationStatus.Succeed)
-                {
-                    if (_fileSystem.WriteCacheBundleFile(Bundle, _tempFilePath))
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Succeed;
-                    }
-                    else
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = $"{_fileSystem.GetType().FullName} failed to write file !";
-                        YooLogger.Error(Error);
-                    }
-                }
-                else
-                {
-                    _steps = ESteps.TryAgain;
-                    Error = _verifyOperation.Error;
-                }
-
-                // 注意：验证完成后直接删除文件
-                if (File.Exists(_tempFilePath))
-                    File.Delete(_tempFilePath);
-            }
-
-            // 重新尝试下载
-            if (_steps == ESteps.TryAgain)
-            {
-                if (FailedTryAgain <= 0)
-                {
-                    Status = EOperationStatus.Failed;
-                    _steps = ESteps.Done;
-                    YooLogger.Error(Error);
-                    return;
-                }
-
-                _tryAgainTimer += Time.unscaledDeltaTime;
-                if (_tryAgainTimer > 1f)
-                {
-                    FailedTryAgain--;
-                    _steps = ESteps.CreateRequest;
-                    YooLogger.Warning(Error);
-                }
-            }
-        }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeWebRequest();
-        }
-        internal override void InternalWaitForAsyncComplete()
-        {
-            while (true)
-            {
-                if (ExecuteWhileDone())
-                {
-                    //TODO 尝试同步加载远端的资源文件失败
-                    if (Status == EOperationStatus.Failed)
-                    {
-                        YooLogger.Error($"Try load bundle {Bundle.BundleName} from remote !");
-                        YooLogger.Error($"The load remote bundle url : {_requestURL}");
-                    }
-
-                    _steps = ESteps.Done;
-                    break;
-                }
-            }
-        }
-
-        private void CreateWebRequest()
-        {
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
-            DownloadHandlerFile handler = new DownloadHandlerFile(_tempFilePath);
-            handler.removeFileOnAbort = true;
-            _webRequest.downloadHandler = handler;
-            _webRequest.disposeDownloadHandlerOnDispose = true;
-            _webRequest.SendWebRequest();
-        }
-        private void DisposeWebRequest()
-        {
-            if (_webRequest != null)
-            {
-                //注意：引擎底层会自动调用Abort方法
-                _webRequest.Dispose();
-                _webRequest = null;
-            }
-        }
-    }
-}

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/DownloadPackageBundleOperation.cs

@@ -0,0 +1,164 @@
+using UnityEngine;
+
+namespace YooAsset
+{
+    internal class DownloadPackageBundleOperation : FSDownloadFileOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CheckExists,
+            CreateRequest,
+            CheckRequest,
+            TryAgain,
+            Done,
+        }
+
+        // 下载参数
+        protected readonly DefaultCacheFileSystem _fileSystem;
+        protected readonly DownloadFileOptions _options;
+        private UnityDownloadFileOperation _unityDownloadFileOp;
+
+        protected int _requestCount = 0;
+        protected float _tryAgainTimer;
+        protected int _failedTryAgain;
+        private ESteps _steps = ESteps.None;
+
+
+        internal DownloadPackageBundleOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle)
+        {
+            _fileSystem = fileSystem;
+            _options = options;
+            _failedTryAgain = options.FailedTryAgain;
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CheckExists;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            // 检测文件是否存在
+            if (_steps == ESteps.CheckExists)
+            {
+                if (_fileSystem.Exists(Bundle))
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                }
+                else
+                {
+                    _steps = ESteps.CreateRequest;
+                }
+            }
+
+            // 创建下载器
+            if (_steps == ESteps.CreateRequest)
+            {
+                if (_options.IsValid() == false)
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = "Download file options is invalid !";
+                    Debug.Log(Error);
+                    return;
+                }
+
+                string url = GetRequestURL();
+                _unityDownloadFileOp = _fileSystem.DownloadCenter.DownloadFileAsync(Bundle, url);
+                _steps = ESteps.CheckRequest;
+            }
+
+            // 检测下载结果
+            if (_steps == ESteps.CheckRequest)
+            {
+                if (IsWaitForAsyncComplete)
+                    _unityDownloadFileOp.WaitForAsyncComplete();
+
+                // 因为并发数量限制，下载器可能被挂起！
+                if (_unityDownloadFileOp.Status == EOperationStatus.None)
+                    return;
+
+                _unityDownloadFileOp.UpdateOperation();
+                Progress = _unityDownloadFileOp.Progress;
+                DownloadedBytes = _unityDownloadFileOp.DownloadedBytes;
+                DownloadProgress = _unityDownloadFileOp.DownloadProgress;
+                if (_unityDownloadFileOp.IsDone == false)
+                    return;
+
+                if (_unityDownloadFileOp.Status == EOperationStatus.Succeed)
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                }
+                else
+                {
+                    if (IsWaitForAsyncComplete == false && _failedTryAgain > 0)
+                    {
+                        _steps = ESteps.TryAgain;
+                        YooLogger.Warning($"Failed download : {_unityDownloadFileOp.URL} Try again !");
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = _unityDownloadFileOp.Error;
+                        YooLogger.Error(Error);
+                    }
+                }
+            }
+
+            // 重新尝试下载
+            if (_steps == ESteps.TryAgain)
+            {
+                _tryAgainTimer += Time.unscaledDeltaTime;
+                if (_tryAgainTimer > 1f)
+                {
+                    _tryAgainTimer = 0f;
+                    _failedTryAgain--;
+                    Progress = 0f;
+                    DownloadProgress = 0f;
+                    DownloadedBytes = 0;
+                    _steps = ESteps.CreateRequest;
+                }
+            }
+        }
+        internal override void InternalWaitForAsyncComplete()
+        {
+            while (true)
+            {
+                if (ExecuteWhileDone())
+                {
+                    _steps = ESteps.Done;
+                    break;
+                }
+            }
+        }
+        internal override void InternalAbort()
+        {
+            // 注意：取消下载任务的时候引用计数减一
+            if (_steps != ESteps.Done)
+            {
+                if (_unityDownloadFileOp != null)
+                {
+                    _unityDownloadFileOp.Release();
+                }
+            }
+        }
+
+        /// <summary>
+        /// 获取网络请求地址
+        /// </summary>
+        protected string GetRequestURL()
+        {
+            // 轮流返回请求地址
+            _requestCount++;
+            if (_requestCount % 2 == 0)
+                return _options.FallbackURL;
+            else
+                return _options.MainURL;
+        }
+    }
+}

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadFileOperation.cs

@@ -0,0 +1,52 @@
+
+namespace YooAsset
+{
+    internal abstract class UnityDownloadFileOperation : UnityWebRequestOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            CopyLocalFile,
+            VerifyFile,
+            Done,
+        }
+
+        protected readonly DefaultCacheFileSystem _fileSystem;
+        protected readonly PackageBundle _bundle;
+        protected readonly string _tempFilePath;
+
+        /// <summary>
+        /// 引用计数
+        /// </summary>
+        public int RefCount { private set; get; }
+
+        internal UnityDownloadFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, string url) : base(url)
+        {
+            _fileSystem = fileSystem;
+            _bundle = bundle;
+            _tempFilePath = _fileSystem.GetTempFilePath(bundle);
+        }
+        internal override string InternalGetDesc()
+        {
+            return $"RefCount : {RefCount}";
+        }
+
+        /// <summary>
+        /// 减少引用计数
+        /// </summary>
+        public void Release()
+        {
+            RefCount--;
+        }
+
+        /// <summary>
+        /// 增加引用计数
+        /// </summary>
+        public void Reference()
+        {
+            RefCount++;
+        }
+    }
+}

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadFileOperation.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 40bb5e9391f413c42ae70e48ca90c4b7
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadLocalFileOperation.cs

@@ -4,140 +4,110 @@ using UnityEngine.Networking;
 
 namespace YooAsset
 {
-    internal class DownloadLocalFileOperation : DefaultDownloadFileOperation
+    internal class UnityDownloadLocalFileOperation : UnityDownloadFileOperation
     {
-        private readonly DefaultCacheFileSystem _fileSystem;
         private VerifyTempFileOperation _verifyOperation;
-        private string _tempFilePath;
         private ESteps _steps = ESteps.None;
 
-        internal DownloadLocalFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
+        internal UnityDownloadLocalFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, string url)
+            : base(fileSystem, bundle, url)
         {
-            _fileSystem = fileSystem;
         }
         internal override void InternalStart()
         {
-            _tempFilePath = _fileSystem.GetTempFilePath(Bundle);
+            if (_fileSystem.CopyLocalFileServices != null)
-            _steps = ESteps.CheckExists;
+                _steps = ESteps.CopyLocalFile;
+            else
+                _steps = ESteps.CreateRequest;
         }
         internal override void InternalUpdate()
         {
             if (_steps == ESteps.None || _steps == ESteps.Done)
                 return;
 
-            // 检测文件是否存在
-            if (_steps == ESteps.CheckExists)
-            {
-                if (_fileSystem.Exists(Bundle))
-                {
-                    _steps = ESteps.Done;
-                    Status = EOperationStatus.Succeed;
-                }
-                else
-                {
-                    if (_fileSystem.CopyLocalFileServices != null)
-                        _steps = ESteps.CopyBuildinBundle;
-                    else
-                        _steps = ESteps.CreateRequest;
-                }
-            }
-
             // 创建下载器
             if (_steps == ESteps.CreateRequest)
             {
                 FileUtility.CreateFileDirectory(_tempFilePath);
-
-                // 删除临时文件
                 if (File.Exists(_tempFilePath))
                     File.Delete(_tempFilePath);
 
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
-                // 重置请求
-                ResetRequestFiled();
-
-                // 创建下载器
                 CreateWebRequest();
-
+                _steps = ESteps.Download;
-                _steps = ESteps.CheckRequest;
             }
 
             // 检测下载结果
-            if (_steps == ESteps.CheckRequest)
+            if (_steps == ESteps.Download)
             {
                 DownloadProgress = _webRequest.downloadProgress;
                 DownloadedBytes = (long)_webRequest.downloadedBytes;
                 Progress = DownloadProgress;
                 if (_webRequest.isDone == false)
-                {
-                    CheckRequestTimeout();
                     return;
-                }
 
                 // 检查网络错误
                 if (CheckRequestResult())
-                    _steps = ESteps.VerifyTempFile;
+                {
+                    _steps = ESteps.VerifyFile;
+                }
                 else
-                    _steps = ESteps.TryAgain;
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                }
 
                 // 注意：最终释放请求器
-                DisposeWebRequest();
+                DisposeRequest();
             }
 
             // 拷贝内置文件
-            if (_steps == ESteps.CopyBuildinBundle)
+            if (_steps == ESteps.CopyLocalFile)
             {
                 FileUtility.CreateFileDirectory(_tempFilePath);
-
-                // 删除临时文件
                 if (File.Exists(_tempFilePath))
                     File.Delete(_tempFilePath);
 
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
                 try
                 {
                     //TODO 团结引擎，在某些机型（红米），拷贝包内文件会小概率失败！需要借助其它方式来拷贝包内文件。
                     var localFileInfo = new LocalFileInfo();
                     localFileInfo.PackageName = _fileSystem.PackageName;
-                    localFileInfo.BundleName = Bundle.BundleName;
+                    localFileInfo.BundleName = _bundle.BundleName;
                     localFileInfo.SourceFileURL = _requestURL;
                     _fileSystem.CopyLocalFileServices.CopyFile(localFileInfo, _tempFilePath);
                     if (File.Exists(_tempFilePath))
                     {
                         DownloadProgress = 1f;
-                        DownloadedBytes = Bundle.FileSize;
+                        DownloadedBytes = _bundle.FileSize;
                         Progress = DownloadProgress;
-                        _steps = ESteps.VerifyTempFile;
+                        _steps = ESteps.VerifyFile;
                     }
                     else
                     {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
                         Error = $"Failed copy local file : {_requestURL}";
-                        _steps = ESteps.TryAgain;
                     }
                 }
                 catch (System.Exception ex)
                 {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
                     Error = $"Failed copy local file : {ex.Message}";
-                    _steps = ESteps.TryAgain;
                 }
             }
 
             // 验证下载文件
-            if (_steps == ESteps.VerifyTempFile)
+            if (_steps == ESteps.VerifyFile)
             {
-                var element = new TempFileElement(_tempFilePath, Bundle.FileCRC, Bundle.FileSize);
+                if (_verifyOperation == null)
+                {
+                    var element = new TempFileElement(_tempFilePath, _bundle.FileCRC, _bundle.FileSize);
                     _verifyOperation = new VerifyTempFileOperation(element);
                     _verifyOperation.StartOperation();
                     AddChildOperation(_verifyOperation);
-                _steps = ESteps.CheckVerifyTempFile;
                 }
 
-            // 等待验证完成
-            if (_steps == ESteps.CheckVerifyTempFile)
-            {
                 if (IsWaitForAsyncComplete)
                     _verifyOperation.WaitForAsyncComplete();
 
@@ -147,7 +117,7 @@ namespace YooAsset
 
                 if (_verifyOperation.Status == EOperationStatus.Succeed)
                 {
-                    if (_fileSystem.WriteCacheBundleFile(Bundle, _tempFilePath))
+                    if (_fileSystem.WriteCacheBundleFile(_bundle, _tempFilePath))
                     {
                         _steps = ESteps.Done;
                         Status = EOperationStatus.Succeed;
@@ -157,12 +127,12 @@ namespace YooAsset
                         _steps = ESteps.Done;
                         Status = EOperationStatus.Failed;
                         Error = $"{_fileSystem.GetType().FullName} failed to write file !";
-                        YooLogger.Error(Error);
                     }
                 }
                 else
                 {
-                    _steps = ESteps.TryAgain;
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
                     Error = _verifyOperation.Error;
                 }
 
@@ -170,20 +140,6 @@ namespace YooAsset
                 if (File.Exists(_tempFilePath))
                     File.Delete(_tempFilePath);
             }
-
-            // 重新尝试下载
-            if (_steps == ESteps.TryAgain)
-            {
-                //TODO 拷贝本地文件失败后不再尝试！
-                Status = EOperationStatus.Failed;
-                _steps = ESteps.Done;
-                YooLogger.Error(Error);
-            }
-        }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeWebRequest();
         }
         internal override void InternalWaitForAsyncComplete()
         {
@@ -201,21 +157,12 @@ namespace YooAsset
 
         private void CreateWebRequest()
         {
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
             DownloadHandlerFile handler = new DownloadHandlerFile(_tempFilePath);
             handler.removeFileOnAbort = true;
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
             _webRequest.downloadHandler = handler;
             _webRequest.disposeDownloadHandlerOnDispose = true;
             _webRequest.SendWebRequest();
         }
-        private void DisposeWebRequest()
-        {
-            if (_webRequest != null)
-            {
-                //注意：引擎底层会自动调用Abort方法
-                _webRequest.Dispose();
-                _webRequest = null;
-            }
-        }
     }
 }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadNormalFileOperation.cs

@@ -0,0 +1,122 @@
+using System.IO;
+using UnityEngine;
+using UnityEngine.Networking;
+
+namespace YooAsset
+{
+    internal sealed class UnityDownloadNormalFileOperation : UnityDownloadFileOperation
+    {
+        private VerifyTempFileOperation _verifyOperation;
+        private ESteps _steps = ESteps.None;
+
+        internal UnityDownloadNormalFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, string url)
+            : base(fileSystem, bundle, url)
+        {
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            // 创建下载器
+            if (_steps == ESteps.CreateRequest)
+            {
+                FileUtility.CreateFileDirectory(_tempFilePath);
+                if (File.Exists(_tempFilePath))
+                    File.Delete(_tempFilePath);
+
+                CreateWebRequest();
+                _steps = ESteps.Download;
+            }
+
+            // 检测下载结果
+            if (_steps == ESteps.Download)
+            {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
+                Progress = DownloadProgress;
+                if (_webRequest.isDone == false)
+                    return;
+
+                // 检查网络错误
+                if (CheckRequestResult())
+                {
+                    _steps = ESteps.VerifyFile;
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                }
+
+                // 注意：最终释放请求器
+                DisposeRequest();
+            }
+
+            // 验证下载文件
+            if (_steps == ESteps.VerifyFile)
+            {
+                if (_verifyOperation == null)
+                {
+                    var element = new TempFileElement(_tempFilePath, _bundle.FileCRC, _bundle.FileSize);
+                    _verifyOperation = new VerifyTempFileOperation(element);
+                    _verifyOperation.StartOperation();
+                    AddChildOperation(_verifyOperation);
+                }
+
+                if (IsWaitForAsyncComplete)
+                    _verifyOperation.WaitForAsyncComplete();
+
+                _verifyOperation.UpdateOperation();
+                if (_verifyOperation.IsDone == false)
+                    return;
+
+                if (_verifyOperation.Status == EOperationStatus.Succeed)
+                {
+                    if (_fileSystem.WriteCacheBundleFile(_bundle, _tempFilePath))
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Succeed;
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = $"{_fileSystem.GetType().FullName} failed to write file ! {_tempFilePath}";
+                    }
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = _verifyOperation.Error;
+                }
+
+                // 注意：验证完成后直接删除文件
+                if (File.Exists(_tempFilePath))
+                    File.Delete(_tempFilePath);
+            }
+        }
+        internal override void InternalWaitForAsyncComplete()
+        {
+            if (_steps != ESteps.Done)
+            {
+                YooLogger.Error($"Try load bundle {_bundle.BundleName} from remote : {_requestURL} !");
+            }
+        }
+
+        private void CreateWebRequest()
+        {
+            DownloadHandlerFile handler = new DownloadHandlerFile(_tempFilePath);
+            handler.removeFileOnAbort = true;
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.downloadHandler = handler;
+            _webRequest.disposeDownloadHandlerOnDispose = true;
+            _webRequest.SendWebRequest();
+        }
+    }
+}

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadResumeFileOperation.cs

@@ -4,63 +4,38 @@ using UnityEngine.Networking;
 
 namespace YooAsset
 {
-    internal sealed class DownloadResumeFileOperation : DefaultDownloadFileOperation
+    internal sealed class UnityDownloadResumeFileOperation : UnityDownloadFileOperation
     {
-        private readonly DefaultCacheFileSystem _fileSystem;
-        private DownloadHandlerFileRange _downloadHandle;
         private VerifyTempFileOperation _verifyOperation;
         private long _fileOriginLength = 0;
-        private string _tempFilePath;
         private ESteps _steps = ESteps.None;
 
-        internal DownloadResumeFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
+        internal UnityDownloadResumeFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, string url)
+            : base(fileSystem, bundle, url)
         {
-            _fileSystem = fileSystem;
         }
         internal override void InternalStart()
         {
-            _tempFilePath = _fileSystem.GetTempFilePath(Bundle);
+            _steps = ESteps.CreateRequest;
-            _steps = ESteps.CheckExists;
         }
         internal override void InternalUpdate()
         {
             if (_steps == ESteps.None || _steps == ESteps.Done)
                 return;
 
-            // 检测文件是否存在
-            if (_steps == ESteps.CheckExists)
-            {
-                if (_fileSystem.Exists(Bundle))
-                {
-                    _steps = ESteps.Done;
-                    Status = EOperationStatus.Succeed;
-                }
-                else
-                {
-                    _steps = ESteps.CreateRequest;
-                }
-            }
-
             // 创建下载器
             if (_steps == ESteps.CreateRequest)
             {
                 FileUtility.CreateFileDirectory(_tempFilePath);
 
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
-                // 重置变量
-                ResetRequestFiled();
-
                 // 获取下载起始位置
                 _fileOriginLength = 0;
                 long fileBeginLength = -1;
                 if (File.Exists(_tempFilePath))
                 {
                     FileInfo fileInfo = new FileInfo(_tempFilePath);
-                    if (fileInfo.Length >= Bundle.FileSize)
+                    if (fileInfo.Length >= _bundle.FileSize)
                     {
-                        // 删除临时文件
                         File.Delete(_tempFilePath);
                     }
                     else
@@ -71,49 +46,48 @@ namespace YooAsset
                     }
                 }
 
-                // 创建下载器
                 CreateWebRequest(fileBeginLength);
-
+                _steps = ESteps.Download;
-                _steps = ESteps.CheckRequest;
             }
 
             // 检测下载结果
-            if (_steps == ESteps.CheckRequest)
+            if (_steps == ESteps.Download)
             {
                 DownloadProgress = _webRequest.downloadProgress;
                 DownloadedBytes = _fileOriginLength + (long)_webRequest.downloadedBytes;
+                Progress = DownloadProgress;
                 if (_webRequest.isDone == false)
-                {
-                    CheckRequestTimeout();
                     return;
-                }
 
                 // 检查网络错误
                 if (CheckRequestResult())
-                    _steps = ESteps.VerifyTempFile;
+                {
+                    _steps = ESteps.VerifyFile;
+                }
                 else
-                    _steps = ESteps.TryAgain;
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                }
 
                 // 在遇到特殊错误的时候删除文件
                 ClearTempFileWhenError();
 
                 // 注意：最终释放请求器
-                DisposeWebRequest();
+                DisposeRequest();
             }
 
             // 验证下载文件
-            if (_steps == ESteps.VerifyTempFile)
+            if (_steps == ESteps.VerifyFile)
             {
-                var element = new TempFileElement(_tempFilePath, Bundle.FileCRC, Bundle.FileSize);
+                if (_verifyOperation == null)
+                {
+                    var element = new TempFileElement(_tempFilePath, _bundle.FileCRC, _bundle.FileSize);
                     _verifyOperation = new VerifyTempFileOperation(element);
                     _verifyOperation.StartOperation();
                     AddChildOperation(_verifyOperation);
-                _steps = ESteps.CheckVerifyTempFile;
                 }
 
-            // 等待验证完成
-            if (_steps == ESteps.CheckVerifyTempFile)
-            {
                 if (IsWaitForAsyncComplete)
                     _verifyOperation.WaitForAsyncComplete();
 
@@ -123,104 +97,38 @@ namespace YooAsset
 
                 if (_verifyOperation.Status == EOperationStatus.Succeed)
                 {
-                    if (_fileSystem.WriteCacheBundleFile(Bundle, _tempFilePath))
+                    if (_fileSystem.WriteCacheBundleFile(_bundle, _tempFilePath))
                     {
+                        _steps = ESteps.Done;
                         Status = EOperationStatus.Succeed;
-                        _steps = ESteps.Done;
                     }
                     else
                     {
-                        Error = $"{_fileSystem.GetType().FullName} failed to write file !";
+                        _steps = ESteps.Done;
                         Status = EOperationStatus.Failed;
-                        _steps = ESteps.Done;
+                        Error = $"{_fileSystem.GetType().FullName} failed to write file !";
                     }
                 }
                 else
                 {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
                     Error = _verifyOperation.Error;
-                    _steps = ESteps.TryAgain;
                 }
 
                 // 注意：验证完成后直接删除文件
                 if (File.Exists(_tempFilePath))
                     File.Delete(_tempFilePath);
             }
-
-            // 重新尝试下载
-            if (_steps == ESteps.TryAgain)
-            {
-                if (FailedTryAgain <= 0)
-                {
-                    Status = EOperationStatus.Failed;
-                    _steps = ESteps.Done;
-                    YooLogger.Error(Error);
-                    return;
-                }
-
-                _tryAgainTimer += Time.unscaledDeltaTime;
-                if (_tryAgainTimer > 1f)
-                {
-                    FailedTryAgain--;
-                    _steps = ESteps.CreateRequest;
-                    YooLogger.Warning(Error);
-                }
-            }
-        }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeWebRequest();
         }
         internal override void InternalWaitForAsyncComplete()
         {
-            while (true)
+            if (_steps != ESteps.Done)
             {
-                if (ExecuteWhileDone())
+                YooLogger.Error($"Try load bundle {_bundle.BundleName} from remote : {_requestURL} !");
-                {
-                    //TODO 尝试同步加载远端的资源文件失败
-                    if (Status == EOperationStatus.Failed)
-                    {
-                        YooLogger.Error($"Try load bundle {Bundle.BundleName} from remote !");
-                        YooLogger.Error($"The load remote bundle url : {_requestURL}");
-                    }
-
-                    _steps = ESteps.Done;
-                    break;
-                }
             }
         }
 
-        private void CreateWebRequest(long beginLength)
-        {
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
-#if UNITY_2019_4_OR_NEWER
-            var handler = new DownloadHandlerFile(_tempFilePath, true);
-            handler.removeFileOnAbort = false;
-#else
-            var handler = new DownloadHandlerFileRange(FileSavePath, Bundle.FileSize, _webRequest);
-            _downloadHandle = handler;
-#endif
-            _webRequest.downloadHandler = handler;
-            _webRequest.disposeDownloadHandlerOnDispose = true;
-            if (beginLength > 0)
-                _webRequest.SetRequestHeader("Range", $"bytes={beginLength}-");
-            _webRequest.SendWebRequest();
-        }
-        private void DisposeWebRequest()
-        {
-            if (_downloadHandle != null)
-            {
-                _downloadHandle.Cleanup();
-                _downloadHandle = null;
-            }
-
-            if (_webRequest != null)
-            {
-                //注意：引擎底层会自动调用Abort方法
-                _webRequest.Dispose();
-                _webRequest = null;
-            }
-        }
         private void ClearTempFileWhenError()
         {
             if (_fileSystem.ResumeDownloadResponseCodes == null)
@@ -233,5 +141,16 @@ namespace YooAsset
                     File.Delete(_tempFilePath);
             }
         }
+        private void CreateWebRequest(long fileBeginLength)
+        {
+            var handler = new DownloadHandlerFile(_tempFilePath, true);
+            handler.removeFileOnAbort = false;
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.downloadHandler = handler;
+            _webRequest.disposeDownloadHandlerOnDispose = true;
+            if (fileBeginLength > 0)
+                _webRequest.SetRequestHeader("Range", $"bytes={fileBeginLength}-");
+            _webRequest.SendWebRequest();
+        }
     }
 }

Assets/YooAsset/Runtime/FileSystem/DefaultWebRemoteFileSystem/Operation/DWRFSLoadBundleOperation.cs

@@ -6,13 +6,13 @@ namespace YooAsset
         private enum ESteps
         {
             None,
-            DownloadAssetBundle,
+            LoadWebAssetBundle,
             Done,
         }
 
         private readonly DefaultWebRemoteFileSystem _fileSystem;
         private readonly PackageBundle _bundle;
-        private DownloadAssetBundleOperation _downloadAssetBundleOp;
+        private LoadWebAssetBundleOperation _loadWebAssetBundleOp;
         private ESteps _steps = ESteps.None;
 
 
@@ -23,50 +23,51 @@ namespace YooAsset
         }
         internal override void InternalStart()
         {
-            _steps = ESteps.DownloadAssetBundle;
+            _steps = ESteps.LoadWebAssetBundle;
         }
         internal override void InternalUpdate()
         {
             if (_steps == ESteps.None || _steps == ESteps.Done)
                 return;
 
-            if (_steps == ESteps.DownloadAssetBundle)
+            if (_steps == ESteps.LoadWebAssetBundle)
             {
-                if (_downloadAssetBundleOp == null)
+                if (_loadWebAssetBundleOp == null)
                 {
-                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue, 60);
+                    string mainURL = _fileSystem.RemoteServices.GetRemoteMainURL(_bundle.FileName);
-                    options.MainURL = _fileSystem.RemoteServices.GetRemoteMainURL(_bundle.FileName);
+                    string fallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(_bundle.FileName);
-                    options.FallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(_bundle.FileName);
+                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue);
+                    options.SetURL(mainURL, fallbackURL);
                     
                     if (_bundle.Encrypted)
                     {
-                        _downloadAssetBundleOp = new DownloadWebEncryptAssetBundleOperation(true, _fileSystem.DecryptionServices, _bundle, options);
+                        _loadWebAssetBundleOp = new LoadWebEncryptAssetBundleOperation(_bundle, options, _fileSystem.DecryptionServices);
-                        _downloadAssetBundleOp.StartOperation();
+                        _loadWebAssetBundleOp.StartOperation();
-                        AddChildOperation(_downloadAssetBundleOp);
+                        AddChildOperation(_loadWebAssetBundleOp);
                     }
                     else
                     {
-                        _downloadAssetBundleOp = new DownloadWebNormalAssetBundleOperation(_fileSystem.DisableUnityWebCache, _bundle, options);
+                        _loadWebAssetBundleOp = new LoadWebNormalAssetBundleOperation(_bundle, options, _fileSystem.DisableUnityWebCache);
-                        _downloadAssetBundleOp.StartOperation();
+                        _loadWebAssetBundleOp.StartOperation();
-                        AddChildOperation(_downloadAssetBundleOp);
+                        AddChildOperation(_loadWebAssetBundleOp);
                     }
                 }
 
-                _downloadAssetBundleOp.UpdateOperation();
+                _loadWebAssetBundleOp.UpdateOperation();
-                DownloadProgress = _downloadAssetBundleOp.DownloadProgress;
+                DownloadProgress = _loadWebAssetBundleOp.DownloadProgress;
-                DownloadedBytes = _downloadAssetBundleOp.DownloadedBytes;
+                DownloadedBytes = _loadWebAssetBundleOp.DownloadedBytes;
-                Progress = _downloadAssetBundleOp.Progress;
+                Progress = _loadWebAssetBundleOp.Progress;
-                if (_downloadAssetBundleOp.IsDone == false)
+                if (_loadWebAssetBundleOp.IsDone == false)
                     return;
 
-                if (_downloadAssetBundleOp.Status == EOperationStatus.Succeed)
+                if (_loadWebAssetBundleOp.Status == EOperationStatus.Succeed)
                 {
-                    var assetBundle = _downloadAssetBundleOp.Result;
+                    var assetBundle = _loadWebAssetBundleOp.Result;
                     if (assetBundle == null)
                     {
                         _steps = ESteps.Done;
                         Status = EOperationStatus.Failed;
-                        Error = $"{nameof(DownloadAssetBundleOperation)} loaded asset bundle is null !";
+                        Error = $"{nameof(DWRFSLoadAssetBundleOperation)} loaded asset bundle is null !";
                     }
                     else
                     {
@@ -79,7 +80,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _downloadAssetBundleOp.Error;
+                    Error = _loadWebAssetBundleOp.Error;
                 }
             }
         }

Assets/YooAsset/Runtime/FileSystem/DefaultWebRemoteFileSystem/Operation/DWRFSLoadPackageManifestOperation.cs

@@ -64,7 +64,7 @@ namespace YooAsset
                 if (_loadWebPackageManifestOp == null)
                 {
                     string packageHash = _requestWebPackageHashOp.PackageHash;
-                    _loadWebPackageManifestOp = new LoadWebRemotePackageManifestOperation(_fileSystem, _packageVersion, packageHash);
+                    _loadWebPackageManifestOp = new LoadWebRemotePackageManifestOperation(_fileSystem, _packageVersion, packageHash, _timeout);
                     _loadWebPackageManifestOp.StartOperation();
                     AddChildOperation(_loadWebPackageManifestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultWebRemoteFileSystem/Operation/internal/LoadWebRemotePackageManifestOperation.cs

@@ -15,6 +15,7 @@ namespace YooAsset
         private readonly DefaultWebRemoteFileSystem _fileSystem;
         private readonly string _packageVersion;
         private readonly string _packageHash;
+        private readonly int _timeout;
         private UnityWebDataRequestOperation _webDataRequestOp;
         private DeserializeManifestOperation _deserializer;
         private int _requestCount = 0;
@@ -26,11 +27,12 @@ namespace YooAsset
         public PackageManifest Manifest { private set; get; }
 
 
-        internal LoadWebRemotePackageManifestOperation(DefaultWebRemoteFileSystem fileSystem, string packageVersion, string packageHash)
+        internal LoadWebRemotePackageManifestOperation(DefaultWebRemoteFileSystem fileSystem, string packageVersion, string packageHash, int timeout)
         {
             _fileSystem = fileSystem;
             _packageVersion = packageVersion;
             _packageHash = packageHash;
+            _timeout = timeout;
         }
         internal override void InternalStart()
         {
@@ -48,7 +50,7 @@ namespace YooAsset
                 {
                     string fileName = YooAssetSettingsData.GetManifestBinaryFileName(_fileSystem.PackageName, _packageVersion);
                     string url = GetWebRequestURL(fileName);
-                    _webDataRequestOp = new UnityWebDataRequestOperation(url);
+                    _webDataRequestOp = new UnityWebDataRequestOperation(url, _timeout);
                     _webDataRequestOp.StartOperation();
                     AddChildOperation(_webDataRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultWebServerFileSystem/Operation/DWSFSInitializeOperation.cs

@@ -32,23 +32,7 @@ namespace YooAsset
             {
                 if (_loadCatalogFileOp == null)
                 {
-#if UNITY_EDITOR
+                    _loadCatalogFileOp = new LoadWebServerCatalogFileOperation(_fileSystem, 60);
-                    /*
-                    // 兼容性初始化
-                    // 说明：内置文件系统在编辑器下运行时需要动态生成
-                    string packageRoot = _fileSystem.FileRoot;
-                    bool result = DefaultBuildinFileSystemBuild.CreateBuildinCatalogFile(_fileSystem.ManifestServices, _fileSystem.PackageName, packageRoot);
-                    if (result == false)
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = $"Create package catalog file failed ! See the detail error in console !";
-                        return;
-                    }
-                    */
-#endif
-
-                    _loadCatalogFileOp = new LoadWebServerCatalogFileOperation(_fileSystem);
                     _loadCatalogFileOp.StartOperation();
                     AddChildOperation(_loadCatalogFileOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultWebServerFileSystem/Operation/DWSFSLoadBundleOperation.cs

@@ -6,13 +6,13 @@ namespace YooAsset
         private enum ESteps
         {
             None,
-            DownloadAssetBundle,
+            LoadWebAssetBundle,
             Done,
         }
 
         private readonly DefaultWebServerFileSystem _fileSystem;
         private readonly PackageBundle _bundle;
-        private DownloadAssetBundleOperation _downloadAssetBundleOp;
+        private LoadWebAssetBundleOperation _loadWebAssetBundleOp;
         private ESteps _steps = ESteps.None;
 
 
@@ -23,51 +23,51 @@ namespace YooAsset
         }
         internal override void InternalStart()
         {
-            _steps = ESteps.DownloadAssetBundle;
+            _steps = ESteps.LoadWebAssetBundle;
         }
         internal override void InternalUpdate()
         {
             if (_steps == ESteps.None || _steps == ESteps.Done)
                 return;
 
-            if (_steps == ESteps.DownloadAssetBundle)
+            if (_steps == ESteps.LoadWebAssetBundle)
             {
-                if (_downloadAssetBundleOp == null)
+                if (_loadWebAssetBundleOp == null)
                 {
-                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue, 60);
                     string fileLoadPath = _fileSystem.GetWebFileLoadPath(_bundle);
-                    options.MainURL = DownloadSystemHelper.ConvertToWWWPath(fileLoadPath);
+                    string mainURL = DownloadSystemHelper.ConvertToWWWPath(fileLoadPath);
-                    options.FallbackURL = options.MainURL;
+                    DownloadFileOptions options = new DownloadFileOptions(int.MaxValue);
+                    options.SetURL(mainURL, mainURL);
 
                     if (_bundle.Encrypted)
                     {
-                        _downloadAssetBundleOp = new DownloadWebEncryptAssetBundleOperation(true, _fileSystem.DecryptionServices, _bundle, options);
+                        _loadWebAssetBundleOp = new LoadWebEncryptAssetBundleOperation(_bundle, options, _fileSystem.DecryptionServices);
-                        _downloadAssetBundleOp.StartOperation();
+                        _loadWebAssetBundleOp.StartOperation();
-                        AddChildOperation(_downloadAssetBundleOp);
+                        AddChildOperation(_loadWebAssetBundleOp);
                     }
                     else
                     {
-                        _downloadAssetBundleOp = new DownloadWebNormalAssetBundleOperation(_fileSystem.DisableUnityWebCache, _bundle, options);
+                        _loadWebAssetBundleOp = new LoadWebNormalAssetBundleOperation(_bundle, options, _fileSystem.DisableUnityWebCache);
-                        _downloadAssetBundleOp.StartOperation();
+                        _loadWebAssetBundleOp.StartOperation();
-                        AddChildOperation(_downloadAssetBundleOp);
+                        AddChildOperation(_loadWebAssetBundleOp);
                     }
                 }
 
-                _downloadAssetBundleOp.UpdateOperation();
+                _loadWebAssetBundleOp.UpdateOperation();
-                DownloadProgress = _downloadAssetBundleOp.DownloadProgress;
+                DownloadProgress = _loadWebAssetBundleOp.DownloadProgress;
-                DownloadedBytes = _downloadAssetBundleOp.DownloadedBytes;
+                DownloadedBytes = _loadWebAssetBundleOp.DownloadedBytes;
-                Progress = _downloadAssetBundleOp.Progress;
+                Progress = _loadWebAssetBundleOp.Progress;
-                if (_downloadAssetBundleOp.IsDone == false)
+                if (_loadWebAssetBundleOp.IsDone == false)
                     return;
 
-                if (_downloadAssetBundleOp.Status == EOperationStatus.Succeed)
+                if (_loadWebAssetBundleOp.Status == EOperationStatus.Succeed)
                 {
-                    var assetBundle = _downloadAssetBundleOp.Result;
+                    var assetBundle = _loadWebAssetBundleOp.Result;
                     if (assetBundle == null)
                     {
                         _steps = ESteps.Done;
                         Status = EOperationStatus.Failed;
-                        Error = $"{nameof(DownloadAssetBundleOperation)} loaded asset bundle is null !";
+                        Error = $"{nameof(DWSFSLoadAssetBundleOperation)} loaded asset bundle is null !";
                     }
                     else
                     {
@@ -80,7 +80,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _downloadAssetBundleOp.Error;
+                    Error = _loadWebAssetBundleOp.Error;
                 }
             }
         }

Assets/YooAsset/Runtime/FileSystem/DefaultWebServerFileSystem/Operation/DWSFSLoadPackageManifestOperation.cs

@@ -64,7 +64,7 @@ namespace YooAsset
                 if (_loadWebPackageManifestOp == null)
                 {
                     string packageHash = _requestWebPackageHashOp.PackageHash;
-                    _loadWebPackageManifestOp = new LoadWebServerPackageManifestOperation(_fileSystem, _packageVersion, packageHash);
+                    _loadWebPackageManifestOp = new LoadWebServerPackageManifestOperation(_fileSystem, _packageVersion, packageHash, _timeout);
                     _loadWebPackageManifestOp.StartOperation();
                     AddChildOperation(_loadWebPackageManifestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultWebServerFileSystem/Operation/internal/LoadWebServerCatalogFileOperation.cs

@@ -1,7 +1,4 @@
 using System;
-using System.IO;
-using System.Collections;
-using System.Collections.Generic;
 
 namespace YooAsset
 {
@@ -16,12 +13,14 @@ namespace YooAsset
         }
 
         private readonly DefaultWebServerFileSystem _fileSystem;
+        private readonly int _timeout;
         private UnityWebDataRequestOperation _webDataRequestOp;
         private ESteps _steps = ESteps.None;
 
-        internal LoadWebServerCatalogFileOperation(DefaultWebServerFileSystem fileSystem)
+        internal LoadWebServerCatalogFileOperation(DefaultWebServerFileSystem fileSystem, int timeout)
         {
             _fileSystem = fileSystem;
+            _timeout = timeout;
         }
         internal override void InternalStart()
         {
@@ -38,7 +37,7 @@ namespace YooAsset
                 {
                     string filePath = _fileSystem.GetCatalogBinaryFileLoadPath();
                     string url = DownloadSystemHelper.ConvertToWWWPath(filePath);
-                    _webDataRequestOp = new UnityWebDataRequestOperation(url);
+                    _webDataRequestOp = new UnityWebDataRequestOperation(url, _timeout);
                     _webDataRequestOp.StartOperation();
                     AddChildOperation(_webDataRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultWebServerFileSystem/Operation/internal/LoadWebServerPackageManifestOperation.cs

@@ -15,6 +15,7 @@ namespace YooAsset
         private readonly DefaultWebServerFileSystem _fileSystem;
         private readonly string _packageVersion;
         private readonly string _packageHash;
+        private readonly int _timeout;
         private UnityWebDataRequestOperation _webDataRequestOp;
         private DeserializeManifestOperation _deserializer;
         private ESteps _steps = ESteps.None;
@@ -25,11 +26,12 @@ namespace YooAsset
         public PackageManifest Manifest { private set; get; }
 
 
-        internal LoadWebServerPackageManifestOperation(DefaultWebServerFileSystem fileSystem, string packageVersion, string packageHash)
+        internal LoadWebServerPackageManifestOperation(DefaultWebServerFileSystem fileSystem, string packageVersion, string packageHash, int timeout)
         {
             _fileSystem = fileSystem;
             _packageVersion = packageVersion;
             _packageHash = packageHash;
+            _timeout = timeout;
         }
         internal override void InternalStart()
         {
@@ -46,7 +48,7 @@ namespace YooAsset
                 {
                     string filePath = _fileSystem.GetWebPackageManifestFilePath(_packageVersion);
                     string url = DownloadSystemHelper.ConvertToWWWPath(filePath);
-                    _webDataRequestOp = new UnityWebDataRequestOperation(url);
+                    _webDataRequestOp = new UnityWebDataRequestOperation(url, _timeout);
                     _webDataRequestOp.StartOperation();
                     AddChildOperation(_webDataRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/Operation/FSDownloadFileOperation.cs

@@ -8,30 +8,44 @@ namespace YooAsset
         /// </summary>
         public readonly int FailedTryAgain;
 
-        /// <summary>
-        /// 超时时间
-        /// </summary>
-        public readonly int Timeout;
-
         /// <summary>
         /// 主资源地址
         /// </summary>
-        public string MainURL { set; get; }
+        public string MainURL { private set; get; }
 
         /// <summary>
         /// 备用资源地址
         /// </summary>
-        public string FallbackURL { set; get; }
+        public string FallbackURL { private set; get; }
 
         /// <summary>
         /// 拷贝的本地文件路径
         /// </summary>
         public string ImportFilePath { set; get; }
 
-        public DownloadFileOptions(int failedTryAgain, int timeout)
+        public DownloadFileOptions(int failedTryAgain)
         {
             FailedTryAgain = failedTryAgain;
-            Timeout = timeout;
+        }
+
+        /// <summary>
+        /// 设置下载地址
+        /// </summary>
+        public void SetURL(string mainURL, string fallbackURL)
+        {
+            MainURL = mainURL;
+            FallbackURL = fallbackURL;
+        }
+
+        /// <summary>
+        /// 是否有效
+        /// </summary>
+        public bool IsValid()
+        {
+            if (string.IsNullOrEmpty(MainURL) || string.IsNullOrEmpty(FallbackURL))
+                return false;
+
+            return true;
         }
     }
 
@@ -39,16 +53,6 @@ namespace YooAsset
     {
         public PackageBundle Bundle { private set; get; }
 
-        /// <summary>
-        /// 引用计数
-        /// </summary>
-        public int RefCount { private set; get; }
-
-        /// <summary>
-        /// HTTP返回码
-        /// </summary>
-        public long HttpCode { protected set; get; }
-
         /// <summary>
         /// 当前下载的字节数
         /// </summary>
@@ -63,31 +67,8 @@ namespace YooAsset
         public FSDownloadFileOperation(PackageBundle bundle)
         {
             Bundle = bundle;
-            RefCount = 0;
-            HttpCode = 0;
             DownloadedBytes = 0;
             DownloadProgress = 0;
         }
-
-        internal override string InternalGetDesc()
-        {
-            return $"RefCount : {RefCount}";
-        }
-
-        /// <summary>
-        /// 减少引用计数
-        /// </summary>
-        public virtual void Release()
-        {
-            RefCount--;
-        }
-
-        /// <summary>
-        /// 增加引用计数
-        /// </summary>
-        public virtual void Reference()
-        {
-            RefCount++;
-        }
     }
 }

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/DefaultDownloadFileOperation.cs

@@ -1,131 +0,0 @@
-using UnityEngine;
-using UnityEngine.Networking;
-
-namespace YooAsset
-{
-    internal abstract class DefaultDownloadFileOperation : FSDownloadFileOperation
-    {
-        protected enum ESteps
-        {
-            None,
-            CheckExists,
-            CreateRequest,
-            CheckRequest,
-            CopyBuildinBundle,
-            VerifyTempFile,
-            CheckVerifyTempFile,
-            TryAgain,
-            Done,
-        }
-
-        // 下载参数
-        protected readonly DownloadFileOptions Options;
-
-        // 请求相关
-        protected UnityWebRequest _webRequest;
-        protected string _requestURL;
-        protected int _requestCount = 0;
-
-        // 超时相关
-        protected bool _isAbort = false;
-        protected long _latestDownloadBytes;
-        protected float _latestDownloadRealtime;
-        protected float _tryAgainTimer;
-
-        // 失败相关
-        protected int FailedTryAgain;
-
-
-        internal DefaultDownloadFileOperation(PackageBundle bundle, DownloadFileOptions options) : base(bundle)
-        {
-            Options = options;
-            FailedTryAgain = options.FailedTryAgain;
-        }
-
-        /// <summary>
-        /// 获取网络请求地址
-        /// </summary>
-        protected string GetRequestURL()
-        {
-            // 轮流返回请求地址
-            _requestCount++;
-            if (_requestCount % 2 == 0)
-                return Options.FallbackURL;
-            else
-                return Options.MainURL;
-        }
-
-        /// <summary>
-        /// 重置请求字段
-        /// </summary>
-        protected void ResetRequestFiled()
-        {
-            // 重置变量
-            _isAbort = false;
-            _latestDownloadBytes = 0;
-            _latestDownloadRealtime = Time.realtimeSinceStartup;
-            DownloadProgress = 0f;
-            DownloadedBytes = 0;
-
-            // 重置计时器
-            if (_tryAgainTimer > 0f)
-                YooLogger.Warning($"Try again download : {_requestURL}");
-            _tryAgainTimer = 0f;
-        }
-
-        /// <summary>
-        /// 检测请求超时
-        /// </summary>
-        protected void CheckRequestTimeout()
-        {
-            // 注意：在连续时间段内无新增下载数据及判定为超时
-            if (_isAbort == false)
-            {
-                if (_latestDownloadBytes != DownloadedBytes)
-                {
-                    _latestDownloadBytes = DownloadedBytes;
-                    _latestDownloadRealtime = UnityEngine.Time.realtimeSinceStartup;
-                }
-
-                float offset = UnityEngine.Time.realtimeSinceStartup - _latestDownloadRealtime;
-                if (offset > Options.Timeout)
-                {
-                    YooLogger.Warning($"Download request timeout : {_requestURL}");
-                    if (_webRequest != null)
-                        _webRequest.Abort();
-                    _isAbort = true;
-                }
-            }
-        }
-
-        /// <summary>
-        /// 检测请求结果
-        /// </summary>
-        protected bool CheckRequestResult()
-        {
-            HttpCode = _webRequest.responseCode;
-
-#if UNITY_2020_3_OR_NEWER
-            if (_webRequest.result != UnityWebRequest.Result.Success)
-            {
-                Error = _webRequest.error;
-                return false;
-            }
-            else
-            {
-                return true;
-            }
-#else
-            if (_webRequest.isNetworkError || _webRequest.isHttpError)
-            {
-                Error = _webRequest.error;
-                return false;
-            }
-            else
-            {
-                return true;
-            }
-#endif
-        }
-    }
-}

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/DownloadAssetBundleOperation.cs

@@ -1,13 +0,0 @@
-using UnityEngine;
-
-namespace YooAsset
-{
-    internal abstract class DownloadAssetBundleOperation : DefaultDownloadFileOperation
-    {
-        internal DownloadAssetBundleOperation(PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
-        {
-        }
-
-        public AssetBundle Result;
-    }
-}

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/DownloadFileWrapper.cs

@@ -1,71 +0,0 @@
-
-namespace YooAsset
-{
-    internal class DownloadFileWrapper : FSDownloadFileOperation
-    {
-        private enum ESteps
-        {
-            None,
-            Download,
-            Done,
-        }
-
-        private readonly FSDownloadFileOperation _downloadFileOp;
-        private ESteps _steps = ESteps.None;
-
-        internal DownloadFileWrapper(FSDownloadFileOperation downloadFileOp) : base(downloadFileOp.Bundle)
-        {
-            _downloadFileOp = downloadFileOp;
-        }
-        internal override void InternalStart()
-        {
-            _steps = ESteps.Download;
-        }
-        internal override void InternalUpdate()
-        {
-            if (_steps == ESteps.None || _steps == ESteps.Done)
-                return;
-
-            if (_steps == ESteps.Download)
-            {
-                if (IsWaitForAsyncComplete)
-                    _downloadFileOp.WaitForAsyncComplete();
-
-                if (_downloadFileOp.Status == EOperationStatus.None)
-                    return;
-
-                _downloadFileOp.UpdateOperation();
-                Progress = _downloadFileOp.Progress;
-                DownloadedBytes = _downloadFileOp.DownloadedBytes;
-                DownloadProgress = _downloadFileOp.DownloadProgress;
-                if (_downloadFileOp.IsDone == false)
-                    return;
-
-                _steps = ESteps.Done;
-                Status = _downloadFileOp.Status;
-                Error = _downloadFileOp.Error;
-                HttpCode = _downloadFileOp.HttpCode;
-            }
-        }
-        internal override void InternalWaitForAsyncComplete()
-        {
-            while (true)
-            {
-                if (ExecuteWhileDone())
-                {
-                    _steps = ESteps.Done;
-                    break;
-                }
-            }
-        }
-
-        public override void Release()
-        {
-            _downloadFileOp.Release();
-        }
-        public override void Reference()
-        {
-            _downloadFileOp.Reference();
-        }
-    }
-}

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/DownloadWebEncryptAssetBundleOperation.cs

@@ -1,157 +0,0 @@
-using UnityEngine;
-using UnityEngine.Networking;
-
-namespace YooAsset
-{
-    internal class DownloadWebEncryptAssetBundleOperation : DownloadAssetBundleOperation
-    {
-        private readonly bool _checkTimeout;
-        private readonly IWebDecryptionServices _decryptionServices;
-        private DownloadHandlerBuffer _downloadhandler;
-        private ESteps _steps = ESteps.None;
-
-        internal DownloadWebEncryptAssetBundleOperation(bool checkTimeout, IWebDecryptionServices decryptionServices, PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
-        {
-            _checkTimeout = checkTimeout;
-            _decryptionServices = decryptionServices;
-        }
-        internal override void InternalStart()
-        {
-            _steps = ESteps.CreateRequest;
-        }
-        internal override void InternalUpdate()
-        {
-            if (_steps == ESteps.None || _steps == ESteps.Done)
-                return;
-
-            // 创建下载器
-            if (_steps == ESteps.CreateRequest)
-            {
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
-                // 重置变量
-                ResetRequestFiled();
-
-                // 创建下载器
-                CreateWebRequest();
-
-                _steps = ESteps.CheckRequest;
-            }
-
-            // 检测下载结果
-            if (_steps == ESteps.CheckRequest)
-            {
-                DownloadProgress = _webRequest.downloadProgress;
-                DownloadedBytes = (long)_webRequest.downloadedBytes;
-                Progress = DownloadProgress;
-                if (_webRequest.isDone == false)
-                {
-                    if (_checkTimeout)
-                        CheckRequestTimeout();
-                    return;
-                }
-
-                // 检查网络错误
-                if (CheckRequestResult())
-                {
-                    if (_decryptionServices == null)
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = $"The {nameof(IWebDecryptionServices)} is null !";
-                        YooLogger.Error(Error);
-                        return;
-                    }
-
-                    var fileData = _downloadhandler.data;
-                    if (fileData == null || fileData.Length == 0)
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = $"The download handler data is null or empty !";
-                        YooLogger.Error(Error);
-                        return;
-                    }
-
-                    AssetBundle assetBundle = LoadEncryptedAssetBundle(fileData);
-                    if (assetBundle == null)
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = "Download handler asset bundle object is null !";
-                    }
-                    else
-                    {
-                        _steps = ESteps.Done;
-                        Result = assetBundle;
-                        Status = EOperationStatus.Succeed;
-                    }
-                }
-                else
-                {
-                    _steps = ESteps.TryAgain;
-                }
-
-                // 注意：最终释放请求器
-                DisposeWebRequest();
-            }
-
-            // 重新尝试下载
-            if (_steps == ESteps.TryAgain)
-            {
-                if (FailedTryAgain <= 0)
-                {
-                    Status = EOperationStatus.Failed;
-                    _steps = ESteps.Done;
-                    YooLogger.Error(Error);
-                    return;
-                }
-
-                _tryAgainTimer += Time.unscaledDeltaTime;
-                if (_tryAgainTimer > 1f)
-                {
-                    FailedTryAgain--;
-                    _steps = ESteps.CreateRequest;
-                    YooLogger.Warning(Error);
-                }
-            }
-        }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeWebRequest();
-        }
-
-        private void CreateWebRequest()
-        {
-            _downloadhandler = new DownloadHandlerBuffer();
-            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
-            _webRequest.downloadHandler = _downloadhandler;
-            _webRequest.disposeDownloadHandlerOnDispose = true;
-            _webRequest.SendWebRequest();
-        }
-        private void DisposeWebRequest()
-        {
-            if (_webRequest != null)
-            {
-                //注意：引擎底层会自动调用Abort方法
-                _webRequest.Dispose();
-                _webRequest = null;
-            }
-        }
-
-        /// <summary>
-        /// 加载加密资源文件
-        /// </summary>
-        private AssetBundle LoadEncryptedAssetBundle(byte[] fileData)
-        {
-            var fileInfo = new WebDecryptFileInfo();
-            fileInfo.BundleName = Bundle.BundleName;
-            fileInfo.FileLoadCRC = Bundle.UnityCRC;
-            fileInfo.FileData = fileData;
-            var decryptResult = _decryptionServices.LoadAssetBundle(fileInfo);
-            return decryptResult.Result;
-        }
-    }
-}

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/LoadWebAssetBundleOperation.cs

@@ -0,0 +1,22 @@
+using UnityEngine;
+
+namespace YooAsset
+{
+    internal abstract class LoadWebAssetBundleOperation : AsyncOperationBase
+    {
+        /// <summary>
+        /// AssetBundle对象
+        /// </summary>
+        public AssetBundle Result;
+
+        /// <summary>
+        /// 下载进度
+        /// </summary>
+        public float DownloadProgress { protected set; get; } = 0;
+
+        /// <summary>
+        /// 下载大小
+        /// </summary>
+        public long DownloadedBytes { protected set; get; } = 0;
+    }
+}

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/LoadWebEncryptAssetBundleOperation.cs

@@ -0,0 +1,146 @@
+using UnityEngine;
+
+namespace YooAsset
+{
+    internal class LoadWebEncryptAssetBundleOperation : LoadWebAssetBundleOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            CheckRequest,
+            TryAgain,
+            Done,
+        }
+
+        private readonly PackageBundle _bundle;
+        private readonly DownloadFileOptions _options;
+        private readonly IWebDecryptionServices _decryptionServices;
+        private UnityWebDataRequestOperation _unityWebDataRequestOp;
+
+        protected int _requestCount = 0;
+        protected float _tryAgainTimer;
+        protected int _failedTryAgain;
+        private ESteps _steps = ESteps.None;
+
+        internal LoadWebEncryptAssetBundleOperation(PackageBundle bundle, DownloadFileOptions options, IWebDecryptionServices decryptionServices)
+        {
+            _bundle = bundle;
+            _options = options;
+            _decryptionServices = decryptionServices;
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            // 创建下载器
+            if (_steps == ESteps.CreateRequest)
+            {
+                if (_decryptionServices == null)
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = $"The {nameof(IWebDecryptionServices)} is null !";
+                    YooLogger.Error(Error);
+                    return;
+                }
+
+                string url = GetRequestURL();
+                _unityWebDataRequestOp = new UnityWebDataRequestOperation(url, 0);
+                _unityWebDataRequestOp.StartOperation();
+                AddChildOperation(_unityWebDataRequestOp);
+                _steps = ESteps.CheckRequest;
+            }
+
+            // 检测下载结果
+            if (_steps == ESteps.CheckRequest)
+            {
+                _unityWebDataRequestOp.UpdateOperation();
+                Progress = _unityWebDataRequestOp.Progress;
+                DownloadProgress = _unityWebDataRequestOp.DownloadProgress;
+                DownloadedBytes = _unityWebDataRequestOp.DownloadedBytes;
+                if (_unityWebDataRequestOp.IsDone == false)
+                    return;
+
+                // 检查网络错误
+                if (_unityWebDataRequestOp.Status == EOperationStatus.Succeed)
+                {
+                    AssetBundle assetBundle = LoadEncryptedAssetBundle(_unityWebDataRequestOp.Result);
+                    if (assetBundle == null)
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = "Failed load encrypted AssetBundle !";
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Succeed;
+                        Result = assetBundle;
+                    }
+                }
+                else
+                {
+                    if (_failedTryAgain > 0)
+                    {
+                        _steps = ESteps.TryAgain;
+                        YooLogger.Warning($"Failed download : {_unityWebDataRequestOp.URL} Try again !");
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = _unityWebDataRequestOp.Error;
+                        YooLogger.Error(Error);
+                    }
+                }
+            }
+
+            // 重新尝试下载
+            if (_steps == ESteps.TryAgain)
+            {
+                _tryAgainTimer += Time.unscaledDeltaTime;
+                if (_tryAgainTimer > 1f)
+                {
+                    _tryAgainTimer = 0f;
+                    _failedTryAgain--;
+                    Progress = 0f;
+                    DownloadProgress = 0f;
+                    DownloadedBytes = 0;
+                    _steps = ESteps.CreateRequest;
+                }
+            }
+        }
+
+        /// <summary>
+        /// 加载加密资源文件
+        /// </summary>
+        private AssetBundle LoadEncryptedAssetBundle(byte[] fileData)
+        {
+            var fileInfo = new WebDecryptFileInfo();
+            fileInfo.BundleName = _bundle.BundleName;
+            fileInfo.FileLoadCRC = _bundle.UnityCRC;
+            fileInfo.FileData = fileData;
+            var decryptResult = _decryptionServices.LoadAssetBundle(fileInfo);
+            return decryptResult.Result;
+        }
+
+        /// <summary>
+        /// 获取网络请求地址
+        /// </summary>
+        protected string GetRequestURL()
+        {
+            // 轮流返回请求地址
+            _requestCount++;
+            if (_requestCount % 2 == 0)
+                return _options.FallbackURL;
+            else
+                return _options.MainURL;
+        }
+    }
+}

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/LoadWebNormalAssetBundleOperation.cs

@@ -0,0 +1,114 @@
+using UnityEngine;
+
+namespace YooAsset
+{
+    internal class LoadWebNormalAssetBundleOperation : LoadWebAssetBundleOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            CheckRequest,
+            TryAgain,
+            Done,
+        }
+
+        private readonly PackageBundle _bundle;
+        private readonly DownloadFileOptions _options;
+        private readonly bool _disableUnityWebCache;
+        private UnityAssetBundleRequestOperation _unityAssetBundleRequestOp;
+
+        protected int _requestCount = 0;
+        protected float _tryAgainTimer;
+        protected int _failedTryAgain;
+        private ESteps _steps = ESteps.None;
+
+
+        internal LoadWebNormalAssetBundleOperation(PackageBundle bundle, DownloadFileOptions options, bool disableUnityWebCache)
+        {
+            _bundle = bundle;
+            _options = options;
+            _disableUnityWebCache = disableUnityWebCache;
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            // 创建下载器
+            if (_steps == ESteps.CreateRequest)
+            {
+                string url = GetRequestURL();
+                _unityAssetBundleRequestOp = new UnityAssetBundleRequestOperation(_bundle, _disableUnityWebCache, url);
+                _unityAssetBundleRequestOp.StartOperation();
+                AddChildOperation(_unityAssetBundleRequestOp);
+                _steps = ESteps.CheckRequest;
+            }
+
+            // 检测下载结果
+            if (_steps == ESteps.CheckRequest)
+            {
+                _unityAssetBundleRequestOp.UpdateOperation();
+                Progress = _unityAssetBundleRequestOp.Progress;
+                DownloadedBytes = _unityAssetBundleRequestOp.DownloadedBytes;
+                DownloadProgress = _unityAssetBundleRequestOp.DownloadProgress;
+                if (_unityAssetBundleRequestOp.IsDone == false)
+                    return;
+
+                if (_unityAssetBundleRequestOp.Status == EOperationStatus.Succeed)
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                    Result = _unityAssetBundleRequestOp.Result;
+                }
+                else
+                {
+                    if (_failedTryAgain > 0)
+                    {
+                        _steps = ESteps.TryAgain;
+                        YooLogger.Warning($"Failed download : {_unityAssetBundleRequestOp.URL} Try again !");
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = _unityAssetBundleRequestOp.Error;
+                        YooLogger.Error(Error);
+                    }
+                }
+            }
+
+            // 重新尝试下载
+            if (_steps == ESteps.TryAgain)
+            {
+                _tryAgainTimer += Time.unscaledDeltaTime;
+                if (_tryAgainTimer > 1f)
+                {
+                    _tryAgainTimer = 0f;
+                    _failedTryAgain--;
+                    Progress = 0f;
+                    DownloadProgress = 0f;
+                    DownloadedBytes = 0;
+                    _steps = ESteps.CreateRequest;
+                }
+            }
+        }
+
+        /// <summary>
+        /// 获取网络请求地址
+        /// </summary>
+        protected string GetRequestURL()
+        {
+            // 轮流返回请求地址
+            _requestCount++;
+            if (_requestCount % 2 == 0)
+                return _options.FallbackURL;
+            else
+                return _options.MainURL;
+        }
+    }
+}

Assets/YooAsset/Runtime/PackageInvokeBuilder/PackageInvokeBuilder.cs

@@ -3,7 +3,7 @@ using System.Reflection;
 
 namespace YooAsset
 {
-    public static class PakcageInvokeBuilder
+    public static class PackageInvokeBuilder
     {
         /// <summary>
         /// 调用Editro类来执行构建资源包任务
@@ -32,7 +32,7 @@ namespace YooAsset
 #else
 namespace YooAsset
 { 
-    public static class PakcageInvokeBuilder
+    public static class PackageInvokeBuilder
     {
         public static PackageInvokeBuildResult InvokeBuilder(PackageInvokeBuildParam buildParam)
         {

Assets/YooAsset/Runtime/ResourceManager/ResourceManager.cs

@@ -60,7 +60,7 @@ namespace YooAsset
         /// <summary>
         /// 尝试卸载指定资源的资源包（包括依赖资源）
         /// </summary>
-        public void TryUnloadUnusedAsset(AssetInfo assetInfo)
+        public void TryUnloadUnusedAsset(AssetInfo assetInfo, int loopCount)
         {
             if (assetInfo.IsInvalid)
             {
@@ -68,6 +68,10 @@ namespace YooAsset
                 return;
             }
 
+            while (loopCount > 0)
+            {
+                loopCount--;
+
                 // 卸载主资源包加载器
                 string mainBundleName = _bundleQuery.GetMainBundleName(assetInfo);
                 var mainLoader = TryGetBundleFileLoader(mainBundleName);
@@ -98,6 +102,7 @@ namespace YooAsset
                     }
                 }
             }
+        }
 
         /// <summary>
         /// 加载场景对象

Assets/YooAsset/Runtime/ResourcePackage/BundleInfo.cs

@@ -36,9 +36,9 @@ namespace YooAsset
         /// <summary>
         /// 创建下载器
         /// </summary>
-        public FSDownloadFileOperation CreateDownloader(int failedTryAgain, int timeout)
+        public FSDownloadFileOperation CreateDownloader(int failedTryAgain)
         {
-            DownloadFileOptions options = new DownloadFileOptions(failedTryAgain, timeout);
+            DownloadFileOptions options = new DownloadFileOptions(failedTryAgain);
             options.ImportFilePath = _importFilePath;
             return _fileSystem.DownloadFileAsync(Bundle, options);
         }

Assets/YooAsset/Runtime/ResourcePackage/Interface/IPlayMode.cs

@@ -34,15 +34,16 @@ namespace YooAsset
         ClearCacheFilesOperation ClearCacheFilesAsync(ClearCacheFilesOptions options);
         
         // 下载相关
-        ResourceDownloaderOperation CreateResourceDownloaderByAll(int downloadingMaxNumber, int failedTryAgain, int timeout);
+        ResourceDownloaderOperation CreateResourceDownloaderByAll(int downloadingMaxNumber, int failedTryAgain);
-        ResourceDownloaderOperation CreateResourceDownloaderByTags(string[] tags, int downloadingMaxNumber, int failedTryAgain, int timeout);
+        ResourceDownloaderOperation CreateResourceDownloaderByTags(string[] tags, int downloadingMaxNumber, int failedTryAgain);
-        ResourceDownloaderOperation CreateResourceDownloaderByPaths(AssetInfo[] assetInfos, bool recursiveDownload, int downloadingMaxNumber, int failedTryAgain, int timeout);
+        ResourceDownloaderOperation CreateResourceDownloaderByPaths(AssetInfo[] assetInfos, bool recursiveDownload, int downloadingMaxNumber, int failedTryAgain);
 
         // 解压相关
-        ResourceUnpackerOperation CreateResourceUnpackerByAll(int upackingMaxNumber, int failedTryAgain, int timeout);
+        ResourceUnpackerOperation CreateResourceUnpackerByAll(int upackingMaxNumber, int failedTryAgain);
-        ResourceUnpackerOperation CreateResourceUnpackerByTags(string[] tags, int upackingMaxNumber, int failedTryAgain, int timeout);
+        ResourceUnpackerOperation CreateResourceUnpackerByTags(string[] tags, int upackingMaxNumber, int failedTryAgain);
         
         // 导入相关
-        ResourceImporterOperation CreateResourceImporterByFilePaths(string[] filePaths, int importerMaxNumber, int failedTryAgain, int timeout);
+        ResourceImporterOperation CreateResourceImporterByFilePaths(string[] filePaths, int importingMaxNumber, int failedTryAgain);
+        ResourceImporterOperation CreateResourceImporterByFileInfos(ImportFileInfo[] fileInfos, int importingMaxNumber, int failedTryAgain);
     }
 }

Assets/YooAsset/Runtime/ResourcePackage/Operation/DownloaderOperation.cs

@@ -40,7 +40,6 @@ namespace YooAsset
         private readonly string _packageName;
         private readonly int _downloadingMaxNumber;
         private readonly int _failedTryAgain;
-        private readonly int _timeout;
         private readonly List<BundleInfo> _bundleInfoList;
         private readonly List<FSDownloadFileOperation> _downloaders = new List<FSDownloadFileOperation>(MAX_LOADER_COUNT);
         private readonly List<FSDownloadFileOperation> _removeList = new List<FSDownloadFileOperation>(MAX_LOADER_COUNT);
@@ -102,13 +101,12 @@ namespace YooAsset
         public DownloadFileBegin DownloadFileBeginCallback { set; get; }
 
 
-        internal DownloaderOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain, int timeout)
+        internal DownloaderOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain)
         {
             _packageName = packageName;
             _bundleInfoList = downloadList;
             _downloadingMaxNumber = UnityEngine.Mathf.Clamp(downloadingMaxNumber, 1, MAX_LOADER_COUNT); ;
             _failedTryAgain = failedTryAgain;
-            _timeout = timeout;
 
             // 设置包裹名称 (fix #210)
             SetPackageName(packageName);
@@ -203,7 +201,7 @@ namespace YooAsset
                     {
                         int index = _bundleInfoList.Count - 1;
                         var bundleInfo = _bundleInfoList[index];
-                        var downloader = bundleInfo.CreateDownloader(_failedTryAgain, _timeout);
+                        var downloader = bundleInfo.CreateDownloader(_failedTryAgain);
                         downloader.StartOperation();
                         this.AddChildOperation(downloader);
 
@@ -366,7 +364,7 @@ namespace YooAsset
 
                 foreach (var downloader in _downloaders)
                 {
-                    downloader.Release();
+                    downloader.AbortOperation();
                 }
             }
         }
@@ -374,52 +372,52 @@ namespace YooAsset
 
     public sealed class ResourceDownloaderOperation : DownloaderOperation
     {
-        internal ResourceDownloaderOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain, int timeout)
+        internal ResourceDownloaderOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain)
-            : base(packageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout)
+            : base(packageName, downloadList, downloadingMaxNumber, failedTryAgain)
         {
         }
 
         /// <summary>
         /// 创建空的下载器
         /// </summary>
-        internal static ResourceDownloaderOperation CreateEmptyDownloader(string packageName, int downloadingMaxNumber, int failedTryAgain, int timeout)
+        internal static ResourceDownloaderOperation CreateEmptyDownloader(string packageName, int downloadingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> downloadList = new List<BundleInfo>();
-            var operation = new ResourceDownloaderOperation(packageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(packageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
     }
     public sealed class ResourceUnpackerOperation : DownloaderOperation
     {
-        internal ResourceUnpackerOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain, int timeout)
+        internal ResourceUnpackerOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain)
-            : base(packageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout)
+            : base(packageName, downloadList, downloadingMaxNumber, failedTryAgain)
         {
         }
 
         /// <summary>
         /// 创建空的解压器
         /// </summary>
-        internal static ResourceUnpackerOperation CreateEmptyUnpacker(string packageName, int upackingMaxNumber, int failedTryAgain, int timeout)
+        internal static ResourceUnpackerOperation CreateEmptyUnpacker(string packageName, int upackingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> downloadList = new List<BundleInfo>();
-            var operation = new ResourceUnpackerOperation(packageName, downloadList, upackingMaxNumber, failedTryAgain, int.MaxValue);
+            var operation = new ResourceUnpackerOperation(packageName, downloadList, upackingMaxNumber, failedTryAgain);
             return operation;
         }
     }
     public sealed class ResourceImporterOperation : DownloaderOperation
     {
-        internal ResourceImporterOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain, int timeout)
+        internal ResourceImporterOperation(string packageName, List<BundleInfo> downloadList, int downloadingMaxNumber, int failedTryAgain)
-            : base(packageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout)
+            : base(packageName, downloadList, downloadingMaxNumber, failedTryAgain)
         {
         }
 
         /// <summary>
         /// 创建空的导入器
         /// </summary>
-        internal static ResourceImporterOperation CreateEmptyImporter(string packageName, int upackingMaxNumber, int failedTryAgain, int timeout)
+        internal static ResourceImporterOperation CreateEmptyImporter(string packageName, int upackingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> downloadList = new List<BundleInfo>();
-            var operation = new ResourceImporterOperation(packageName, downloadList, upackingMaxNumber, failedTryAgain, int.MaxValue);
+            var operation = new ResourceImporterOperation(packageName, downloadList, upackingMaxNumber, failedTryAgain);
             return operation;
         }
     }

Assets/YooAsset/Runtime/ResourcePackage/Operation/PreDownloadContentOperation.cs

@@ -107,11 +107,11 @@ namespace YooAsset
             if (Status != EOperationStatus.Succeed)
             {
                 YooLogger.Warning($"{nameof(PreDownloadContentOperation)} status is not succeed !");
-                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain, timeout);
+                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain);
             }
 
             List<BundleInfo> downloadList = _impl.GetDownloadListByAll(_manifest);
-            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
 
@@ -127,11 +127,11 @@ namespace YooAsset
             if (Status != EOperationStatus.Succeed)
             {
                 YooLogger.Warning($"{nameof(PreDownloadContentOperation)} status is not succeed !");
-                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain, timeout);
+                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain);
             }
 
             List<BundleInfo> downloadList = _impl.GetDownloadListByTags(_manifest, new string[] { tag });
-            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
 
@@ -147,11 +147,11 @@ namespace YooAsset
             if (Status != EOperationStatus.Succeed)
             {
                 YooLogger.Warning($"{nameof(PreDownloadContentOperation)} status is not succeed !");
-                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain, timeout);
+                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain);
             }
 
             List<BundleInfo> downloadList = _impl.GetDownloadListByTags(_manifest, tags);
-            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
 
@@ -167,7 +167,7 @@ namespace YooAsset
             if (Status != EOperationStatus.Succeed)
             {
                 YooLogger.Warning($"{nameof(PreDownloadContentOperation)} status is not succeed !");
-                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain, timeout);
+                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain);
             }
 
             List<AssetInfo> assetInfos = new List<AssetInfo>();
@@ -175,7 +175,7 @@ namespace YooAsset
             assetInfos.Add(assetInfo);
 
             List<BundleInfo> downloadList = _impl.GetDownloadListByPaths(_manifest, assetInfos.ToArray(), recursiveDownload);
-            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
 
@@ -191,7 +191,7 @@ namespace YooAsset
             if (Status != EOperationStatus.Succeed)
             {
                 YooLogger.Warning($"{nameof(PreDownloadContentOperation)} status is not succeed !");
-                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain, timeout);
+                return ResourceDownloaderOperation.CreateEmptyDownloader(_impl.PackageName, downloadingMaxNumber, failedTryAgain);
             }
 
             List<AssetInfo> assetInfos = new List<AssetInfo>(locations.Length);
@@ -202,7 +202,7 @@ namespace YooAsset
             }
 
             List<BundleInfo> downloadList = _impl.GetDownloadListByPaths(_manifest, assetInfos.ToArray(), recursiveDownload);
-            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(_impl.PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
     }

Assets/YooAsset/Runtime/ResourcePackage/PlayMode/EditorSimulateModeHelper.cs

@@ -10,7 +10,7 @@ namespace YooAsset
             buildParam.InvokeAssmeblyName = "YooAsset.Editor";
             buildParam.InvokeClassFullName = "YooAsset.Editor.AssetBundleSimulateBuilder";
             buildParam.InvokeMethodName = "SimulateBuild";
-            return PakcageInvokeBuilder.InvokeBuilder(buildParam);
+            return PackageInvokeBuilder.InvokeBuilder(buildParam);
         }
     }
 }

Assets/YooAsset/Runtime/ResourcePackage/PlayMode/PlayModeImpl.cs

@@ -104,44 +104,50 @@ namespace YooAsset
         }
 
         // 下载相关
-        ResourceDownloaderOperation IPlayMode.CreateResourceDownloaderByAll(int downloadingMaxNumber, int failedTryAgain, int timeout)
+        ResourceDownloaderOperation IPlayMode.CreateResourceDownloaderByAll(int downloadingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> downloadList = GetDownloadListByAll(ActiveManifest);
-            var operation = new ResourceDownloaderOperation(PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
-        ResourceDownloaderOperation IPlayMode.CreateResourceDownloaderByTags(string[] tags, int downloadingMaxNumber, int failedTryAgain, int timeout)
+        ResourceDownloaderOperation IPlayMode.CreateResourceDownloaderByTags(string[] tags, int downloadingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> downloadList = GetDownloadListByTags(ActiveManifest, tags);
-            var operation = new ResourceDownloaderOperation(PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
-        ResourceDownloaderOperation IPlayMode.CreateResourceDownloaderByPaths(AssetInfo[] assetInfos, bool recursiveDownload, int downloadingMaxNumber, int failedTryAgain, int timeout)
+        ResourceDownloaderOperation IPlayMode.CreateResourceDownloaderByPaths(AssetInfo[] assetInfos, bool recursiveDownload, int downloadingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> downloadList = GetDownloadListByPaths(ActiveManifest, assetInfos, recursiveDownload);
-            var operation = new ResourceDownloaderOperation(PackageName, downloadList, downloadingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceDownloaderOperation(PackageName, downloadList, downloadingMaxNumber, failedTryAgain);
             return operation;
         }
 
         // 解压相关
-        ResourceUnpackerOperation IPlayMode.CreateResourceUnpackerByAll(int upackingMaxNumber, int failedTryAgain, int timeout)
+        ResourceUnpackerOperation IPlayMode.CreateResourceUnpackerByAll(int upackingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> unpcakList = GetUnpackListByAll(ActiveManifest);
-            var operation = new ResourceUnpackerOperation(PackageName, unpcakList, upackingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceUnpackerOperation(PackageName, unpcakList, upackingMaxNumber, failedTryAgain);
             return operation;
         }
-        ResourceUnpackerOperation IPlayMode.CreateResourceUnpackerByTags(string[] tags, int upackingMaxNumber, int failedTryAgain, int timeout)
+        ResourceUnpackerOperation IPlayMode.CreateResourceUnpackerByTags(string[] tags, int upackingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> unpcakList = GetUnpackListByTags(ActiveManifest, tags);
-            var operation = new ResourceUnpackerOperation(PackageName, unpcakList, upackingMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceUnpackerOperation(PackageName, unpcakList, upackingMaxNumber, failedTryAgain);
             return operation;
         }
 
         // 导入相关
-        ResourceImporterOperation IPlayMode.CreateResourceImporterByFilePaths(string[] filePaths, int importerMaxNumber, int failedTryAgain, int timeout)
+        ResourceImporterOperation IPlayMode.CreateResourceImporterByFilePaths(string[] filePaths, int importingMaxNumber, int failedTryAgain)
         {
             List<BundleInfo> importerList = GetImporterListByFilePaths(ActiveManifest, filePaths);
-            var operation = new ResourceImporterOperation(PackageName, importerList, importerMaxNumber, failedTryAgain, timeout);
+            var operation = new ResourceImporterOperation(PackageName, importerList, importingMaxNumber, failedTryAgain);
+            return operation;
+        }
+        ResourceImporterOperation IPlayMode.CreateResourceImporterByFileInfos(ImportFileInfo[] fileInfos, int importingMaxNumber, int failedTryAgain)
+        {
+            List<BundleInfo> importerList = GetImporterListByFileInfos(ActiveManifest, fileInfos);
+            var operation = new ResourceImporterOperation(PackageName, importerList, importingMaxNumber, failedTryAgain);
             return operation;
         }
         #endregion
@@ -415,15 +421,60 @@ namespace YooAsset
             return result;
         }
         public List<BundleInfo> GetImporterListByFilePaths(PackageManifest manifest, string[] filePaths)
+        {
+            if (manifest == null)
+                return new List<BundleInfo>();
+
+            ImportFileInfo[] fileInfos = new ImportFileInfo[filePaths.Length];
+            for (int i = 0; i < filePaths.Length; i++)
+            {
+                ImportFileInfo fileInfo = new ImportFileInfo();
+                fileInfo.FilePath = filePaths[i];
+                fileInfos[i] = fileInfo;
+            }
+
+            return GetImporterListByFileInfos(manifest, fileInfos);
+        }
+        public List<BundleInfo> GetImporterListByFileInfos(PackageManifest manifest, ImportFileInfo[] fileInfos)
         {
             if (manifest == null)
                 return new List<BundleInfo>();
 
             List<BundleInfo> result = new List<BundleInfo>();
-            foreach (var filePath in filePaths)
+            foreach (var fileInfo in fileInfos)
+            {
+                string filePath = fileInfo.FilePath;
+                if (string.IsNullOrEmpty(filePath))
+                    continue;
+
+                PackageBundle packageBundle = null;
+                if (string.IsNullOrEmpty(fileInfo.BundleName) == false)
+                {
+                    if (manifest.TryGetPackageBundleByBundleName(fileInfo.BundleName, out packageBundle) == false)
+                    {
+                        YooLogger.Warning($"Not found package bundle, bundle name : {fileInfo.BundleName}");
+                        continue;
+                    }
+                }
+                else if (string.IsNullOrEmpty(fileInfo.BundleGUID) == false)
+                {
+                    if (manifest.TryGetPackageBundleByBundleGUID(fileInfo.BundleGUID, out packageBundle) == false)
+                    {
+                        YooLogger.Warning($"Not found package bundle, bundle guid : {fileInfo.BundleGUID}");
+                        continue;
+                    }
+                }
+                else
                 {
                     string fileName = System.IO.Path.GetFileName(filePath);
-                if (manifest.TryGetPackageBundleByFileName(fileName, out PackageBundle packageBundle))
+                    if (manifest.TryGetPackageBundleByFileName(fileName, out packageBundle) == false)
+                    {
+                        YooLogger.Warning($"Not found package bundle, file name : {fileName}");
+                        continue;
+                    }
+                }
+
+                if (packageBundle != null)
                 {
                     var fileSystem = GetBelongFileSystem(packageBundle);
                     if (fileSystem == null)
@@ -435,10 +486,6 @@ namespace YooAsset
                         result.Add(bundleInfo);
                     }
                 }
-                else
-                {
-                    YooLogger.Warning($"Not found package bundle, importer file path : {filePath}");
-                }
             }
             return result;
         }

Assets/YooAsset/Runtime/ResourcePackage/ResourcePackage.cs

@@ -361,21 +361,21 @@ namespace YooAsset
         /// 资源回收
         /// 说明：尝试卸载指定的资源
         /// </summary>
-        public void TryUnloadUnusedAsset(string location)
+        public void TryUnloadUnusedAsset(string location, int loopCount = 10)
         {
             DebugCheckInitialize();
             AssetInfo assetInfo = ConvertLocationToAssetInfo(location, null);
-            _resourceManager.TryUnloadUnusedAsset(assetInfo);
+            _resourceManager.TryUnloadUnusedAsset(assetInfo, loopCount);
         }
 
         /// <summary>
         /// 资源回收
         /// 说明：尝试卸载指定的资源
         /// </summary>
-        public void TryUnloadUnusedAsset(AssetInfo assetInfo)
+        public void TryUnloadUnusedAsset(AssetInfo assetInfo, int loopCount = 10)
         {
             DebugCheckInitialize();
-            _resourceManager.TryUnloadUnusedAsset(assetInfo);
+            _resourceManager.TryUnloadUnusedAsset(assetInfo, loopCount);
         }
         #endregion
 
@@ -969,7 +969,7 @@ namespace YooAsset
         public ResourceDownloaderOperation CreateResourceDownloader(int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceDownloaderByAll(downloadingMaxNumber, failedTryAgain, timeout);
+            return _playModeImpl.CreateResourceDownloaderByAll(downloadingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -982,7 +982,7 @@ namespace YooAsset
         public ResourceDownloaderOperation CreateResourceDownloader(string tag, int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceDownloaderByTags(new string[] { tag }, downloadingMaxNumber, failedTryAgain, timeout);
+            return _playModeImpl.CreateResourceDownloaderByTags(new string[] { tag }, downloadingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -995,7 +995,7 @@ namespace YooAsset
         public ResourceDownloaderOperation CreateResourceDownloader(string[] tags, int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceDownloaderByTags(tags, downloadingMaxNumber, failedTryAgain, timeout);
+            return _playModeImpl.CreateResourceDownloaderByTags(tags, downloadingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -1011,11 +1011,11 @@ namespace YooAsset
             DebugCheckInitialize();
             var assetInfo = ConvertLocationToAssetInfo(location, null);
             AssetInfo[] assetInfos = new AssetInfo[] { assetInfo };
-            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos, recursiveDownload, downloadingMaxNumber, failedTryAgain, timeout);
+            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos, recursiveDownload, downloadingMaxNumber, failedTryAgain);
         }
         public ResourceDownloaderOperation CreateBundleDownloader(string location, int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
-            return CreateBundleDownloader(location, false, downloadingMaxNumber, failedTryAgain, timeout);
+            return CreateBundleDownloader(location, false, downloadingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -1035,11 +1035,11 @@ namespace YooAsset
                 var assetInfo = ConvertLocationToAssetInfo(location, null);
                 assetInfos.Add(assetInfo);
             }
-            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos.ToArray(), recursiveDownload, downloadingMaxNumber, failedTryAgain, timeout);
+            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos.ToArray(), recursiveDownload, downloadingMaxNumber, failedTryAgain);
         }
         public ResourceDownloaderOperation CreateBundleDownloader(string[] locations, int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
-            return CreateBundleDownloader(locations, false, downloadingMaxNumber, failedTryAgain, timeout);
+            return CreateBundleDownloader(locations, false, downloadingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -1054,11 +1054,11 @@ namespace YooAsset
         {
             DebugCheckInitialize();
             AssetInfo[] assetInfos = new AssetInfo[] { assetInfo };
-            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos, recursiveDownload, downloadingMaxNumber, failedTryAgain, timeout);
+            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos, recursiveDownload, downloadingMaxNumber, failedTryAgain);
         }
         public ResourceDownloaderOperation CreateBundleDownloader(AssetInfo assetInfo, int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
-            return CreateBundleDownloader(assetInfo, false, downloadingMaxNumber, failedTryAgain, timeout);
+            return CreateBundleDownloader(assetInfo, false, downloadingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -1072,11 +1072,11 @@ namespace YooAsset
         public ResourceDownloaderOperation CreateBundleDownloader(AssetInfo[] assetInfos, bool recursiveDownload, int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos, recursiveDownload, downloadingMaxNumber, failedTryAgain, timeout);
+            return _playModeImpl.CreateResourceDownloaderByPaths(assetInfos, recursiveDownload, downloadingMaxNumber, failedTryAgain);
         }
         public ResourceDownloaderOperation CreateBundleDownloader(AssetInfo[] assetInfos, int downloadingMaxNumber, int failedTryAgain, int timeout = 60)
         {
-            return CreateBundleDownloader(assetInfos, false, downloadingMaxNumber, failedTryAgain, timeout);
+            return CreateBundleDownloader(assetInfos, false, downloadingMaxNumber, failedTryAgain);
         }
         #endregion
 
@@ -1089,7 +1089,7 @@ namespace YooAsset
         public ResourceUnpackerOperation CreateResourceUnpacker(int unpackingMaxNumber, int failedTryAgain)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceUnpackerByAll(unpackingMaxNumber, failedTryAgain, int.MaxValue);
+            return _playModeImpl.CreateResourceUnpackerByAll(unpackingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -1101,7 +1101,7 @@ namespace YooAsset
         public ResourceUnpackerOperation CreateResourceUnpacker(string tag, int unpackingMaxNumber, int failedTryAgain)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceUnpackerByTags(new string[] { tag }, unpackingMaxNumber, failedTryAgain, int.MaxValue);
+            return _playModeImpl.CreateResourceUnpackerByTags(new string[] { tag }, unpackingMaxNumber, failedTryAgain);
         }
 
         /// <summary>
@@ -1113,7 +1113,7 @@ namespace YooAsset
         public ResourceUnpackerOperation CreateResourceUnpacker(string[] tags, int unpackingMaxNumber, int failedTryAgain)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceUnpackerByTags(tags, unpackingMaxNumber, failedTryAgain, int.MaxValue);
+            return _playModeImpl.CreateResourceUnpackerByTags(tags, unpackingMaxNumber, failedTryAgain);
         }
         #endregion
 
@@ -1128,7 +1128,20 @@ namespace YooAsset
         public ResourceImporterOperation CreateResourceImporter(string[] filePaths, int importerMaxNumber, int failedTryAgain)
         {
             DebugCheckInitialize();
-            return _playModeImpl.CreateResourceImporterByFilePaths(filePaths, importerMaxNumber, failedTryAgain, int.MaxValue);
+            return _playModeImpl.CreateResourceImporterByFilePaths(filePaths, importerMaxNumber, failedTryAgain);
+        }
+
+        /// <summary>
+        /// 创建资源导入器
+        /// 注意：资源信息里需要指定BundleName或BundleGUID！
+        /// </summary>
+        /// <param name="fileInfos">资源信息列表</param>
+        /// <param name="importerMaxNumber">同时导入的最大文件数</param>
+        /// <param name="failedTryAgain">导入失败的重试次数</param>
+        public ResourceImporterOperation CreateResourceImporter(ImportFileInfo[] fileInfos, int importerMaxNumber, int failedTryAgain)
+        {
+            DebugCheckInitialize();
+            return _playModeImpl.CreateResourceImporterByFileInfos(fileInfos, importerMaxNumber, failedTryAgain);
         }
         #endregion
 

Assets/YooAsset/Samples~/Extension Sample/Runtime/ExtensionOperation/CopyBuildinManifestOperation.cs

@@ -58,7 +58,7 @@ public class CopyBuildinManifestOperation : GameAsyncOperation
                 string sourcePath = GetBuildinHashFilePath();
                 string destPath = GetCacheHashFilePath();
                 string url = DownloadSystemHelper.ConvertToWWWPath(sourcePath);
-                _hashFileRequestOp = new UnityWebFileRequestOperation(url, destPath);
+                _hashFileRequestOp = new UnityWebFileRequestOperation(url, destPath, 60);
                 OperationSystem.StartOperation(_packageName, _hashFileRequestOp);
             }
 
@@ -97,7 +97,7 @@ public class CopyBuildinManifestOperation : GameAsyncOperation
                 string sourcePath = GetBuildinManifestFilePath();
                 string destPath = GetCacheManifestFilePath();
                 string url = DownloadSystemHelper.ConvertToWWWPath(sourcePath);
-                _manifestFileRequestOp = new UnityWebFileRequestOperation(url, destPath);
+                _manifestFileRequestOp = new UnityWebFileRequestOperation(url, destPath, 60);
                 OperationSystem.StartOperation(_packageName, _manifestFileRequestOp);
             }
 

Assets/YooAsset/Samples~/Extension Sample/Runtime/ExtensionOperation/GetBuildinPackageVersionOperation.cs

@@ -44,7 +44,7 @@ public class GetBuildinPackageVersionOperation : GameAsyncOperation
             {
                 string filePath = GetBuildinPackageVersionFilePath();
                 string url = DownloadSystemHelper.ConvertToWWWPath(filePath);
-                _versionFileRequestOp = new UnityWebTextRequestOperation(url);
+                _versionFileRequestOp = new UnityWebTextRequestOperation(url, 60);
                 OperationSystem.StartOperation(_packageName, _versionFileRequestOp);
             }
 

Assets/YooAsset/Samples~/Extension Sample/Runtime/SpriteAtlasLoader/SpriteAtlasLoader.cs

@@ -37,8 +37,10 @@ public class SpriteAtlasLoader : MonoBehaviour
                 return;
             }
 
+            var atlas = loadHandle.AssetObject as SpriteAtlas;
+            _loadedAtlas.Add(atlasName, atlas);
             _loadHandles.Add(loadHandle);
-            callback.Invoke(loadHandle.AssetObject as SpriteAtlas);
+            callback.Invoke(atlas);
         }
     }
 }

Assets/YooAsset/Samples~/Mini Game/Runtime/GooglePlayFileSystem.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 8c5a1726d94498e4cbe30f5f510cc796
+guid: d27136885efd6ab4fae1a1fea23b0010
 folderAsset: yes
 DefaultImporter:
   externalObjects: {}

Assets/YooAsset/Samples~/Mini Game/Runtime/GooglePlayFileSystem/GooglePlayFileSystem.cs

@@ -0,0 +1,42 @@
+#if UNITY_ANDROID && GOOGLE_PLAY
+using System.Collections.Generic;
+using UnityEngine;
+using YooAsset;
+using System.Linq;
+using System;
+
+public static class GooglePlayFileSystemCreater
+{
+    public static FileSystemParameters CreateFileSystemParameters(string packageRoot)
+    {
+        string fileSystemClass = $"{nameof(GooglePlayFileSystem)},YooAsset.MiniGame";
+        var fileSystemParams = new FileSystemParameters(fileSystemClass, packageRoot);
+        return fileSystemParams;
+    }
+}
+
+/// <summary>
+/// 兼容谷歌Play Asset Delivery的文件系统
+/// </summary>
+internal class GooglePlayFileSystem : DefaultBuildinFileSystem
+{
+    public GooglePlayFileSystem()
+    {
+    }
+
+    public override FSLoadBundleOperation LoadBundleFile(PackageBundle bundle)
+    {
+        if (bundle.BundleType == (int)EBuildBundleType.AssetBundle)
+        {
+            var operation = new GPFSLoadAssetBundleOperation(this, bundle);
+            return operation;
+        }
+        else
+        {
+            string error = $"{nameof(GooglePlayFileSystem)} not support load bundle type : {bundle.BundleType}";
+            var operation = new FSLoadBundleCompleteOperation(error);
+            return operation;
+        }
+    }
+}
+#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/GooglePlayFileSystem/GooglePlayFileSystem.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 2e26d6ba3f3c6cd48bc22d40f1857f89
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Samples~/Mini Game/Runtime/GooglePlayFileSystem/Operation.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 055e7cf3bb9567f43bf15964d43c632f
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Samples~/Mini Game/Runtime/GooglePlayFileSystem/Operation/GPFSLoadAssetBundleOperation.cs

@@ -0,0 +1,85 @@
+#if UNITY_ANDROID && GOOGLE_PLAY
+using System.IO;
+using UnityEngine;
+using YooAsset;
+using Google.Play.AssetDelivery;
+
+internal class GPFSLoadAssetBundleOperation : FSLoadBundleOperation
+{
+    private enum ESteps
+    {
+        None,
+        LoadAssetBundle,
+        CheckResult,
+        Done,
+    }
+
+    private readonly GooglePlayFileSystem _fileSystem;
+    private readonly PackageBundle _bundle;
+    private PlayAssetBundleRequest _bundleRequest;
+    private ESteps _steps = ESteps.None;
+
+
+    internal GPFSLoadAssetBundleOperation(GooglePlayFileSystem fileSystem, PackageBundle bundle)
+    {
+        _fileSystem = fileSystem;
+        _bundle = bundle;
+    }
+    internal override void InternalStart()
+    {
+        DownloadProgress = 1f;
+        DownloadedBytes = _bundle.FileSize;
+        _steps = ESteps.LoadAssetBundle;
+    }
+    internal override void InternalUpdate()
+    {
+        if (_steps == ESteps.None || _steps == ESteps.Done)
+            return;
+
+        if (_steps == ESteps.LoadAssetBundle)
+        {
+            if (_bundle.Encrypted)
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = $"The {nameof(GooglePlayFileSystem)} not support bundle encrypted !";
+                YooLogger.Error(Error);
+                return;
+            }
+
+            _bundleRequest = PlayAssetDelivery.RetrieveAssetBundleAsync(_bundle.FileName);
+            _steps = ESteps.CheckResult;
+        }
+
+        if (_steps == ESteps.CheckResult)
+        {
+            if (_bundleRequest.IsDone == false)
+                return;
+
+            if (_bundleRequest.Error != AssetDeliveryErrorCode.NoError)
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = $"Failed to load delivery asset bundle file : {_bundle.BundleName} Error : {_bundleRequest.Error}";
+                YooLogger.Error(Error);
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Succeed;
+                Result = new AssetBundleResult(_fileSystem, _bundle, _bundleRequest.AssetBundle, null);
+            }
+        }
+    }
+    internal override void InternalWaitForAsyncComplete()
+    {
+        if (_steps != ESteps.Done)
+        {
+            _steps = ESteps.Done;
+            Status = EOperationStatus.Failed;
+            Error = $"{nameof(GooglePlayFileSystem)} not support sync load method !";
+            UnityEngine.Debug.LogError(Error);
+        }
+    }
+}
+#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/GooglePlayFileSystem/Operation/GPFSLoadAssetBundleOperation.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0aeb57dcd2a7a8841bb161f5f343a25e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Samples~/Mini Game/Runtime/TiktokFileSystem/Operation/TTFSDownloadFileOperation.cs

@@ -1,16 +1,30 @@
 #if UNITY_WEBGL && DOUYINMINIGAME
 using UnityEngine;
-using UnityEngine.Networking;
 using YooAsset;
 
-internal class TTFSDownloadFileOperation : DefaultDownloadFileOperation
+internal class TTFSDownloadFileOperation : FSDownloadFileOperation
 {
-    private TiktokFileSystem _fileSystem;
+    protected enum ESteps
+    {
+        None,
+        CreateRequest,
+        CheckRequest,
+        TryAgain,
+        Done,
+    }
+
+    private readonly TiktokFileSystem _fileSystem;
+    private readonly DownloadFileOptions _options;
+    private UnityWebCacheRequestOperation _webCacheRequestOp;
+    private int _requestCount = 0;
+    private float _tryAgainTimer;
+    private int _failedTryAgain;
     private ESteps _steps = ESteps.None;
 
-    internal TTFSDownloadFileOperation(TiktokFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
+    internal TTFSDownloadFileOperation(TiktokFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle)
     {
         _fileSystem = fileSystem;
+        _options = options;
     }
     internal override void InternalStart()
     {
@@ -21,81 +35,77 @@ internal class TTFSDownloadFileOperation : DefaultDownloadFileOperation
         // 创建下载器
         if (_steps == ESteps.CreateRequest)
         {
-            // 获取请求地址
+            string url = GetRequestURL();
-            _requestURL = GetRequestURL();
+            _webCacheRequestOp = new UnityWebCacheRequestOperation(url);
-
+            _webCacheRequestOp.StartOperation();
-            // 重置变量
+            AddChildOperation(_webCacheRequestOp);
-            ResetRequestFiled();
-
-            // 创建下载器
-            CreateWebRequest();
-
             _steps = ESteps.CheckRequest;
         }
 
         // 检测下载结果
         if (_steps == ESteps.CheckRequest)
         {
-            DownloadProgress = _webRequest.downloadProgress;
+            _webCacheRequestOp.UpdateOperation();
-            DownloadedBytes = (long)_webRequest.downloadedBytes;
+            Progress = _webCacheRequestOp.Progress;
-            Progress = DownloadProgress;
+            DownloadProgress = _webCacheRequestOp.DownloadProgress;
-            if (_webRequest.isDone == false)
+            DownloadedBytes = (long)_webCacheRequestOp.DownloadedBytes;
-            {
+            if (_webCacheRequestOp.IsDone == false)
-                CheckRequestTimeout();
                 return;
-            }
 
-            // 检查网络错误
+            if (_webCacheRequestOp.Status == EOperationStatus.Succeed)
-            if (CheckRequestResult())
             {
                 _steps = ESteps.Done;
                 Status = EOperationStatus.Succeed;
+
+                //TODO 需要验证抖音插件请求器的下载进度
+                DownloadProgress = 1f;
+                DownloadedBytes = Bundle.FileSize;
+                Progress = 1f;
             }
             else
+            {
+                if (_failedTryAgain > 0)
                 {
                     _steps = ESteps.TryAgain;
+                    YooLogger.Warning($"Failed download : {_webCacheRequestOp.URL} Try again !");
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = _webCacheRequestOp.Error;
+                    YooLogger.Error(Error);
+                }
             }
-
-            // 注意：最终释放请求器
-            DisposeWebRequest();
         }
 
         // 重新尝试下载
         if (_steps == ESteps.TryAgain)
         {
-            if (FailedTryAgain <= 0)
-            {
-                Status = EOperationStatus.Failed;
-                _steps = ESteps.Done;
-                YooLogger.Error(Error);
-                return;
-            }
-
             _tryAgainTimer += Time.unscaledDeltaTime;
             if (_tryAgainTimer > 1f)
             {
-                FailedTryAgain--;
+                _tryAgainTimer = 0f;
+                _failedTryAgain--;
+                Progress = 0f;
+                DownloadProgress = 0f;
+                DownloadedBytes = 0;
                 _steps = ESteps.CreateRequest;
-                YooLogger.Warning(Error);
             }
         }
     }
 
-    private void CreateWebRequest()
+    /// <summary>
+    /// 获取网络请求地址
+    /// </summary>
+    private string GetRequestURL()
     {
-        //TODO : 抖音小游戏没有找到预下载方法
+        // 轮流返回请求地址
-        _webRequest = UnityWebRequest.Get(_requestURL);
+        _requestCount++;
-        _webRequest.disposeDownloadHandlerOnDispose = true;
+        if (_requestCount % 2 == 0)
-        _webRequest.SendWebRequest();
+            return _options.FallbackURL;
-    }
+        else
-    private void DisposeWebRequest()
+            return _options.MainURL;
-    {
-        if (_webRequest != null)
-        {
-            //注意：引擎底层会自动调用Abort方法
-            _webRequest.Dispose();
-            _webRequest = null;
-        }
     }
 }
 #endif

Assets/YooAsset/Samples~/Mini Game/Runtime/TiktokFileSystem/Operation/TTFSLoadBundleOperation.cs

@@ -1,6 +1,5 @@
 #if UNITY_WEBGL && DOUYINMINIGAME
 using UnityEngine;
-using UnityEngine.Networking;
 using YooAsset;
 
 internal class TTFSLoadBundleOperation : FSLoadBundleOperation
@@ -14,7 +13,7 @@ internal class TTFSLoadBundleOperation : FSLoadBundleOperation
 
     private readonly TiktokFileSystem _fileSystem;
     private readonly PackageBundle _bundle;
-    private DownloadAssetBundleOperation _downloadAssetBundleOp;
+    private LoadWebAssetBundleOperation _loadWebAssetBundleOp;
     private ESteps _steps = ESteps.None;
 
     internal TTFSLoadBundleOperation(TiktokFileSystem fileSystem, PackageBundle bundle)
@@ -33,54 +32,46 @@ internal class TTFSLoadBundleOperation : FSLoadBundleOperation
 
         if (_steps == ESteps.DownloadAssetBundle)
         {
-            if (_downloadAssetBundleOp == null)
+            if (_loadWebAssetBundleOp == null)
             {
-                DownloadFileOptions options = new DownloadFileOptions(int.MaxValue, 60);
+                string mainRUL = _fileSystem.RemoteServices.GetRemoteMainURL(_bundle.FileName);
-                options.MainURL = _fileSystem.RemoteServices.GetRemoteMainURL(_bundle.FileName); ;
+                string fallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(_bundle.FileName);
-                options.FallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(_bundle.FileName);
+                DownloadFileOptions options = new DownloadFileOptions(int.MaxValue);
+                options.SetURL(mainRUL, fallbackURL);
 
                 if (_bundle.Encrypted)
                 {
-                    _downloadAssetBundleOp = new DownloadWebEncryptAssetBundleOperation(false, _fileSystem.DecryptionServices, _bundle, options);
+                    _loadWebAssetBundleOp = new LoadWebEncryptAssetBundleOperation(_bundle, options, _fileSystem.DecryptionServices);
-                    _downloadAssetBundleOp.StartOperation();
+                    _loadWebAssetBundleOp.StartOperation();
-                    AddChildOperation(_downloadAssetBundleOp);
+                    AddChildOperation(_loadWebAssetBundleOp);
                 }
                 else
                 {
-                    _downloadAssetBundleOp = new DownloadTiktokAssetBundleOperation(_bundle, options);
+                    _loadWebAssetBundleOp = new LoadTiktokAssetBundleOperation(_bundle, options);
-                    _downloadAssetBundleOp.StartOperation();
+                    _loadWebAssetBundleOp.StartOperation();
-                    AddChildOperation(_downloadAssetBundleOp);
+                    AddChildOperation(_loadWebAssetBundleOp);
                 }
             }
 
-            _downloadAssetBundleOp.UpdateOperation();
+            _loadWebAssetBundleOp.UpdateOperation();
-            DownloadProgress = _downloadAssetBundleOp.DownloadProgress;
+            Progress = _loadWebAssetBundleOp.Progress;
-            DownloadedBytes = (long)_downloadAssetBundleOp.DownloadedBytes;
+            DownloadProgress = _loadWebAssetBundleOp.DownloadProgress;
-            Progress = DownloadProgress;
+            DownloadedBytes = (long)_loadWebAssetBundleOp.DownloadedBytes;
-            if (_downloadAssetBundleOp.IsDone == false)
+            if (_loadWebAssetBundleOp.IsDone == false)
                 return;
 
-            if (_downloadAssetBundleOp.Status == EOperationStatus.Succeed)
+            if (_loadWebAssetBundleOp.Status == EOperationStatus.Succeed)
-            {
-                var assetBundle = _downloadAssetBundleOp.Result;
-                if (assetBundle == null)
-                {
-                    _steps = ESteps.Done;
-                    Status = EOperationStatus.Failed;
-                    Error = $"{nameof(DownloadAssetBundleOperation)} loaded asset bundle is null !";
-                }
-                else
             {
+                var assetBundle = _loadWebAssetBundleOp.Result;
                 _steps = ESteps.Done;
                 Result = new TTAssetBundleResult(_fileSystem, _bundle, assetBundle);
                 Status = EOperationStatus.Succeed;
             }
-            }
             else
             {
                 _steps = ESteps.Done;
                 Status = EOperationStatus.Failed;
-                Error = _downloadAssetBundleOp.Error;
+                Error = _loadWebAssetBundleOp.Error;
             }
         }
     }

Assets/YooAsset/Samples~/Mini Game/Runtime/TiktokFileSystem/Operation/internal/DownloadTiktokAssetBundleOperation.cs

@@ -1,126 +0,0 @@
-#if UNITY_WEBGL && DOUYINMINIGAME
-using UnityEngine;
-using TTSDK;
-
-namespace YooAsset
-{
-    internal class DownloadTiktokAssetBundleOperation : DownloadAssetBundleOperation
-    {
-        private ESteps _steps = ESteps.None;
-        
-        internal DownloadTiktokAssetBundleOperation(PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
-        {
-        }
-        internal override void InternalStart()
-        {
-            _steps = ESteps.CreateRequest;
-        }
-        internal override void InternalUpdate()
-        {
-            if (_steps == ESteps.None || _steps == ESteps.Done)
-                return;
-
-            // 创建下载器
-            if (_steps == ESteps.CreateRequest)
-            {
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
-                // 重置变量
-                ResetRequestFiled();
-
-                // 创建下载器
-                CreateWebRequest();
-
-                _steps = ESteps.CheckRequest;
-            }
-
-            // 检测下载结果
-            if (_steps == ESteps.CheckRequest)
-            {
-                DownloadProgress = _webRequest.downloadProgress;
-                DownloadedBytes = (long)_webRequest.downloadedBytes;
-                Progress = DownloadProgress;
-                if (_webRequest.isDone == false)
-                {
-                    //TODO 需要验证抖音插件请求器的下载进度
-                    //CheckRequestTimeout();
-                    return;
-                }
-
-                // 检查网络错误
-                if (CheckRequestResult())
-                {
-                    var downloadHanlder = (DownloadHandlerTTAssetBundle)_webRequest.downloadHandler;
-                    AssetBundle assetBundle = downloadHanlder.assetBundle;
-                    if (assetBundle == null)
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = "Download handler asset bundle object is null !";
-                    }
-                    else
-                    {
-                        _steps = ESteps.Done;
-                        Result = assetBundle;
-                        Status = EOperationStatus.Succeed;
-
-                        //TODO 需要验证抖音插件请求器的下载进度
-                        DownloadProgress = 1f;
-                        DownloadedBytes = Bundle.FileSize;
-                        Progress = 1f;
-                    }
-                }
-                else
-                {
-                    _steps = ESteps.TryAgain;
-                }
-
-                // 注意：最终释放请求器
-                DisposeWebRequest();
-            }
-
-            // 重新尝试下载
-            if (_steps == ESteps.TryAgain)
-            {
-                if (FailedTryAgain <= 0)
-                {
-                    Status = EOperationStatus.Failed;
-                    _steps = ESteps.Done;
-                    YooLogger.Error(Error);
-                    return;
-                }
-
-                _tryAgainTimer += Time.unscaledDeltaTime;
-                if (_tryAgainTimer > 1f)
-                {
-                    FailedTryAgain--;
-                    _steps = ESteps.CreateRequest;
-                    YooLogger.Warning(Error);
-                }
-            }
-        }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeWebRequest();
-        }
-        
-        private void CreateWebRequest()
-        {
-            _webRequest = TTAssetBundle.GetAssetBundle(_requestURL);
-            _webRequest.disposeDownloadHandlerOnDispose = true;
-            _webRequest.SendWebRequest();
-        }
-        private void DisposeWebRequest()
-        {
-            if (_webRequest != null)
-            {
-                //注意：引擎底层会自动调用Abort方法
-                _webRequest.Dispose();
-                _webRequest = null;
-            }
-        }
-    }
-}
-#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/TiktokFileSystem/Operation/internal/LoadTiktokAssetBundleOperation.cs

@@ -0,0 +1,114 @@
+#if UNITY_WEBGL && DOUYINMINIGAME
+using UnityEngine;
+
+namespace YooAsset
+{
+    internal class LoadTiktokAssetBundleOperation : LoadWebAssetBundleOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            CheckRequest,
+            TryAgain,
+            Done,
+        }
+
+        private readonly PackageBundle _bundle;
+        private readonly DownloadFileOptions _options;
+        private UnityTiktokAssetBundleRequestOperation _unityTiktokAssetBundleRequestOp;
+
+        private int _requestCount = 0;
+        private float _tryAgainTimer;
+        private int _failedTryAgain;
+        private ESteps _steps = ESteps.None;
+
+
+        internal LoadTiktokAssetBundleOperation(PackageBundle bundle, DownloadFileOptions options)
+        {
+            _bundle = bundle;
+            _options = options;
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            // 创建下载器
+            if (_steps == ESteps.CreateRequest)
+            {
+                string url = GetRequestURL();
+                _unityTiktokAssetBundleRequestOp = new UnityTiktokAssetBundleRequestOperation(_bundle, url);
+                _unityTiktokAssetBundleRequestOp.StartOperation();
+                AddChildOperation(_unityTiktokAssetBundleRequestOp);
+                _steps = ESteps.CheckRequest;
+            }
+
+            // 检测下载结果
+            if (_steps == ESteps.CheckRequest)
+            {
+                _unityTiktokAssetBundleRequestOp.UpdateOperation();
+                Progress = _unityTiktokAssetBundleRequestOp.Progress;
+                DownloadProgress = _unityTiktokAssetBundleRequestOp.DownloadProgress;
+                DownloadedBytes = (long)_unityTiktokAssetBundleRequestOp.DownloadedBytes;
+                if (_unityTiktokAssetBundleRequestOp.IsDone == false)
+                    return;
+
+                if (_unityTiktokAssetBundleRequestOp.Status == EOperationStatus.Succeed)
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                    Result = _unityTiktokAssetBundleRequestOp.Result;
+                }
+                else
+                {
+                    if (_failedTryAgain > 0)
+                    {
+                        _steps = ESteps.TryAgain;
+                        YooLogger.Warning($"Failed download : {_unityTiktokAssetBundleRequestOp.URL} Try again !");
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = _unityTiktokAssetBundleRequestOp.Error;
+                        YooLogger.Error(Error);
+                    }
+                }
+            }
+
+            // 重新尝试下载
+            if (_steps == ESteps.TryAgain)
+            {
+                _tryAgainTimer += Time.unscaledDeltaTime;
+                if (_tryAgainTimer > 1f)
+                {
+                    _tryAgainTimer = 0f;
+                    _failedTryAgain--;
+                    Progress = 0f;
+                    DownloadProgress = 0f;
+                    DownloadedBytes = 0;
+                    _steps = ESteps.CreateRequest;
+                }
+            }
+        }
+
+        /// <summary>
+        /// 获取网络请求地址
+        /// </summary>
+        private string GetRequestURL()
+        {
+            // 轮流返回请求地址
+            _requestCount++;
+            if (_requestCount % 2 == 0)
+                return _options.FallbackURL;
+            else
+                return _options.MainURL;
+        }
+    }
+}
+#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/TiktokFileSystem/Operation/internal/UnityTiktokAssetBundleRequestOperation.cs

@@ -0,0 +1,95 @@
+#if UNITY_WEBGL && DOUYINMINIGAME
+using UnityEngine.Networking;
+using UnityEngine;
+using TTSDK;
+
+namespace YooAsset
+{
+    internal class UnityTiktokAssetBundleRequestOperation : UnityWebRequestOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            Done,
+        }
+
+        private readonly PackageBundle _packageBundle;
+        private UnityWebRequestAsyncOperation _requestOperation;
+        private ESteps _steps = ESteps.None;
+
+        /// <summary>
+        /// 请求结果
+        /// </summary>
+        public AssetBundle Result { private set; get; }
+
+        internal UnityTiktokAssetBundleRequestOperation(PackageBundle bundle, string url) : base(url)
+        {
+            _packageBundle = bundle;
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            if (_steps == ESteps.CreateRequest)
+            {
+                CreateWebRequest();
+                _steps = ESteps.Download;
+            }
+
+            if (_steps == ESteps.Download)
+            {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
+                Progress = _requestOperation.progress;
+                if (_requestOperation.isDone == false)
+                    return;
+
+                if (CheckRequestResult())
+                {
+                    var downloadHanlder = (DownloadHandlerTTAssetBundle)_webRequest.downloadHandler;
+                    AssetBundle assetBundle = downloadHanlder.assetBundle;
+                    if (assetBundle == null)
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = $"URL : {_requestURL} Download handler asset bundle object is null !";
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Result = assetBundle;
+                        Status = EOperationStatus.Succeed;
+
+                        //TODO 需要验证抖音插件请求器的下载进度
+                        DownloadProgress = 1f;
+                        DownloadedBytes = _packageBundle.FileSize;
+                        Progress = 1f;
+                    }
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                }
+
+                // 注意：最终释放请求器
+                DisposeRequest();
+            }
+        }
+
+        private void CreateWebRequest()
+        {
+            _webRequest = TTAssetBundle.GetAssetBundle(_requestURL);
+            _webRequest.disposeDownloadHandlerOnDispose = true;
+            _requestOperation = _webRequest.SendWebRequest();
+        }
+    }
+}
+#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/TiktokFileSystem/Operation/internal/UnityTiktokAssetBundleRequestOperation.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: dbac28b7a131d1043af35b3c2dbe083f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Samples~/Mini Game/Runtime/TiktokFileSystem/TiktokFileSystem.cs

@@ -136,8 +136,9 @@ internal class TiktokFileSystem : IFileSystem
     }
     public virtual FSDownloadFileOperation DownloadFileAsync(PackageBundle bundle, DownloadFileOptions options)
     {
-        options.MainURL = RemoteServices.GetRemoteMainURL(bundle.FileName);
+        string mainURL = RemoteServices.GetRemoteMainURL(bundle.FileName);
-        options.FallbackURL = RemoteServices.GetRemoteFallbackURL(bundle.FileName);
+        string fallbackURL = RemoteServices.GetRemoteFallbackURL(bundle.FileName);
+        options.SetURL(mainURL, fallbackURL);
         var operation = new TTFSDownloadFileOperation(this, bundle, options);
         return operation;
     }

Assets/YooAsset/Samples~/Mini Game/Runtime/WechatFileSystem/Operation/WXFSDownloadFileOperation.cs

@@ -1,17 +1,30 @@
 #if UNITY_WEBGL && WEIXINMINIGAME
 using UnityEngine;
-using UnityEngine.Networking;
 using YooAsset;
-using WeChatWASM;
 
-internal class WXFSDownloadFileOperation : DefaultDownloadFileOperation
+internal class WXFSDownloadFileOperation : FSDownloadFileOperation
 {
-    private WechatFileSystem _fileSystem;
+    protected enum ESteps
+    {
+        None,
+        CreateRequest,
+        CheckRequest,
+        TryAgain,
+        Done,
+    }
+
+    private readonly WechatFileSystem _fileSystem;
+    private readonly DownloadFileOptions _options;
+    private UnityWebCacheRequestOperation _webCacheRequestOp;
+    private int _requestCount = 0;
+    private float _tryAgainTimer;
+    private int _failedTryAgain;
     private ESteps _steps = ESteps.None;
 
-    internal WXFSDownloadFileOperation(WechatFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
+    internal WXFSDownloadFileOperation(WechatFileSystem fileSystem, PackageBundle bundle, DownloadFileOptions options) : base(bundle)
     {
         _fileSystem = fileSystem;
+        _options = options;
     }
     internal override void InternalStart()
     {
@@ -22,34 +35,25 @@ internal class WXFSDownloadFileOperation : DefaultDownloadFileOperation
         // 创建下载器
         if (_steps == ESteps.CreateRequest)
         {
-            // 获取请求地址
+            string url = GetRequestURL();
-            _requestURL = GetRequestURL();
+            _webCacheRequestOp = new UnityWebCacheRequestOperation(url);
-
+            _webCacheRequestOp.SetRequestHeader("wechatminigame-preload", "1");
-            // 重置变量
+            _webCacheRequestOp.StartOperation();
-            ResetRequestFiled();
+            AddChildOperation(_webCacheRequestOp);
-
-            // 创建下载器
-            CreateWebRequest();
-
             _steps = ESteps.CheckRequest;
         }
 
         // 检测下载结果
         if (_steps == ESteps.CheckRequest)
         {
-            DownloadProgress = _webRequest.downloadProgress;
+            _webCacheRequestOp.UpdateOperation();
-            DownloadedBytes = (long)_webRequest.downloadedBytes;
+            Progress = _webCacheRequestOp.Progress;
-            Progress = DownloadProgress;
+            DownloadProgress = _webCacheRequestOp.DownloadProgress;
-            if (_webRequest.isDone == false)
+            DownloadedBytes = (long)_webCacheRequestOp.DownloadedBytes;
-            {
+            if (_webCacheRequestOp.IsDone == false)
-                //TODO 由于微信小游戏插件的问题，暂时不能判定超时！
-                // Issue : https://github.com/wechat-miniprogram/minigame-unity-webgl-transform/issues/108#
-                //CheckRequestTimeout();
                 return;
-            }
 
-            // 检查网络错误
+            if (_webCacheRequestOp.Status == EOperationStatus.Succeed)
-            if (CheckRequestResult())
             {
                 _steps = ESteps.Done;
                 Status = EOperationStatus.Succeed;
@@ -61,50 +65,49 @@ internal class WXFSDownloadFileOperation : DefaultDownloadFileOperation
                 Progress = 1f;
             }
             else
+            {
+                if (_failedTryAgain > 0)
                 {
                     _steps = ESteps.TryAgain;
+                    YooLogger.Warning($"Failed download : {_webCacheRequestOp.URL} Try again !");
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = _webCacheRequestOp.Error;
+                    YooLogger.Error(Error);
+                }
             }
-
-            // 注意：最终释放请求器
-            DisposeWebRequest();
         }
 
         // 重新尝试下载
         if (_steps == ESteps.TryAgain)
         {
-            if (FailedTryAgain <= 0)
-            {
-                Status = EOperationStatus.Failed;
-                _steps = ESteps.Done;
-                YooLogger.Error(Error);
-                return;
-            }
-
             _tryAgainTimer += Time.unscaledDeltaTime;
             if (_tryAgainTimer > 1f)
             {
-                FailedTryAgain--;
+                _tryAgainTimer = 0f;
+                _failedTryAgain--;
+                Progress = 0f;
+                DownloadProgress = 0f;
+                DownloadedBytes = 0;
                 _steps = ESteps.CreateRequest;
-                YooLogger.Warning(Error);
             }
         }
     }
 
-    private void CreateWebRequest()
+    /// <summary>
+    /// 获取网络请求地址
+    /// </summary>
+    private string GetRequestURL()
     {
-        _webRequest = UnityWebRequest.Get(_requestURL);
+        // 轮流返回请求地址
-        _webRequest.SetRequestHeader("wechatminigame-preload", "1");
+        _requestCount++;
-        _webRequest.disposeDownloadHandlerOnDispose = true;
+        if (_requestCount % 2 == 0)
-        _webRequest.SendWebRequest();
+            return _options.FallbackURL;
-    }
+        else
-    private void DisposeWebRequest()
+            return _options.MainURL;
-    {
-        if (_webRequest != null)
-        {
-            //注意：引擎底层会自动调用Abort方法
-            _webRequest.Dispose();
-            _webRequest = null;
-        }
     }
 }
 #endif

Assets/YooAsset/Samples~/Mini Game/Runtime/WechatFileSystem/Operation/WXFSLoadBundleOperation.cs

@@ -12,7 +12,7 @@ internal class WXFSLoadBundleOperation : FSLoadBundleOperation
 
     private readonly WechatFileSystem _fileSystem;
     private readonly PackageBundle _bundle;
-    private DownloadAssetBundleOperation _downloadAssetBundleOp;
+    private LoadWebAssetBundleOperation _loadWebAssetBundleOp;
     private ESteps _steps = ESteps.None;
 
     internal WXFSLoadBundleOperation(WechatFileSystem fileSystem, PackageBundle bundle)
@@ -31,54 +31,46 @@ internal class WXFSLoadBundleOperation : FSLoadBundleOperation
 
         if (_steps == ESteps.DownloadAssetBundle)
         {
-            if (_downloadAssetBundleOp == null)
+            if (_loadWebAssetBundleOp == null)
             {
-                DownloadFileOptions options = new DownloadFileOptions(int.MaxValue, 60);
+                string mainURL = _fileSystem.RemoteServices.GetRemoteMainURL(_bundle.FileName);
-                options.MainURL = _fileSystem.RemoteServices.GetRemoteMainURL(_bundle.FileName); ;
+                string fallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(_bundle.FileName);
-                options.FallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(_bundle.FileName);
+                DownloadFileOptions options = new DownloadFileOptions(int.MaxValue);
+                options.SetURL(mainURL, fallbackURL);
 
                 if (_bundle.Encrypted)
                 {
-                    _downloadAssetBundleOp = new DownloadWebEncryptAssetBundleOperation(false, _fileSystem.DecryptionServices, _bundle, options);
+                    _loadWebAssetBundleOp = new LoadWebEncryptAssetBundleOperation(_bundle, options, _fileSystem.DecryptionServices);
-                    _downloadAssetBundleOp.StartOperation();
+                    _loadWebAssetBundleOp.StartOperation();
-                    AddChildOperation(_downloadAssetBundleOp);
+                    AddChildOperation(_loadWebAssetBundleOp);
                 }
                 else
                 {
-                    _downloadAssetBundleOp = new DownloadWechatAssetBundleOperation(_bundle, options);
+                    _loadWebAssetBundleOp = new LoadWechatAssetBundleOperation(_bundle, options);
-                    _downloadAssetBundleOp.StartOperation();
+                    _loadWebAssetBundleOp.StartOperation();
-                    AddChildOperation(_downloadAssetBundleOp);
+                    AddChildOperation(_loadWebAssetBundleOp);
                 }
             }
 
-            _downloadAssetBundleOp.UpdateOperation();
+            _loadWebAssetBundleOp.UpdateOperation();
-            DownloadProgress = _downloadAssetBundleOp.DownloadProgress;
+            Progress = _loadWebAssetBundleOp.Progress;
-            DownloadedBytes = (long)_downloadAssetBundleOp.DownloadedBytes;
+            DownloadProgress = _loadWebAssetBundleOp.DownloadProgress;
-            Progress = DownloadProgress;
+            DownloadedBytes = (long)_loadWebAssetBundleOp.DownloadedBytes;
-            if (_downloadAssetBundleOp.IsDone == false)
+            if (_loadWebAssetBundleOp.IsDone == false)
                 return;
 
-            if (_downloadAssetBundleOp.Status == EOperationStatus.Succeed)
+            if (_loadWebAssetBundleOp.Status == EOperationStatus.Succeed)
-            {
-                var assetBundle = _downloadAssetBundleOp.Result;
-                if (assetBundle == null)
-                {
-                    _steps = ESteps.Done;
-                    Status = EOperationStatus.Failed;
-                    Error = $"{nameof(DownloadAssetBundleOperation)} loaded asset bundle is null !";
-                }
-                else
             {
+                var assetBundle = _loadWebAssetBundleOp.Result;
                 _steps = ESteps.Done;
                 Result = new WXAssetBundleResult(_fileSystem, _bundle, assetBundle);
                 Status = EOperationStatus.Succeed;
             }
-            }
             else
             {
                 _steps = ESteps.Done;
                 Status = EOperationStatus.Failed;
-                Error = _downloadAssetBundleOp.Error;
+                Error = _loadWebAssetBundleOp.Error;
             }
         }
     }

Assets/YooAsset/Samples~/Mini Game/Runtime/WechatFileSystem/Operation/internal/DownloadWechatAssetBundleOperation.cs

@@ -1,128 +0,0 @@
-#if UNITY_WEBGL && WEIXINMINIGAME
-using UnityEngine;
-using WeChatWASM;
-
-namespace YooAsset
-{
-    internal class DownloadWechatAssetBundleOperation : DownloadAssetBundleOperation
-    {
-        private ESteps _steps = ESteps.None;
-
-        internal DownloadWechatAssetBundleOperation(PackageBundle bundle, DownloadFileOptions options) : base(bundle, options)
-        {
-        }
-        internal override void InternalStart()
-        {
-            _steps = ESteps.CreateRequest;
-        }
-        internal override void InternalUpdate()
-        {
-            if (_steps == ESteps.None || _steps == ESteps.Done)
-                return;
-
-            // 创建下载器
-            if (_steps == ESteps.CreateRequest)
-            {
-                // 获取请求地址
-                _requestURL = GetRequestURL();
-
-                // 重置变量
-                ResetRequestFiled();
-
-                // 创建下载器
-                CreateWebRequest();
-
-                _steps = ESteps.CheckRequest;
-            }
-
-            // 检测下载结果
-            if (_steps == ESteps.CheckRequest)
-            {
-                DownloadProgress = _webRequest.downloadProgress;
-                DownloadedBytes = (long)_webRequest.downloadedBytes;
-                Progress = DownloadProgress;
-                if (_webRequest.isDone == false)
-                {
-                    //TODO 由于微信小游戏插件的问题，暂时不能判定超时！
-                    // Issue : https://github.com/wechat-miniprogram/minigame-unity-webgl-transform/issues/108#
-                    //CheckRequestTimeout();
-                    return;
-                }
-
-                // 检查网络错误
-                if (CheckRequestResult())
-                {
-                    var downloadHanlder = (DownloadHandlerWXAssetBundle)_webRequest.downloadHandler;
-                    AssetBundle assetBundle = downloadHanlder.assetBundle;
-                    if (assetBundle == null)
-                    {
-                        _steps = ESteps.Done;
-                        Status = EOperationStatus.Failed;
-                        Error = "Download handler asset bundle object is null !";
-                    }
-                    else
-                    {
-                        _steps = ESteps.Done;
-                        Result = assetBundle;
-                        Status = EOperationStatus.Succeed;
-
-                        //TODO 解决微信小游戏插件问题
-                        // Issue : https://github.com/wechat-miniprogram/minigame-unity-webgl-transform/issues/108#
-                        DownloadProgress = 1f;
-                        DownloadedBytes = Bundle.FileSize;
-                        Progress = 1f;
-                    }
-                }
-                else
-                {
-                    _steps = ESteps.TryAgain;
-                }
-
-                // 注意：最终释放请求器
-                DisposeWebRequest();
-            }
-
-            // 重新尝试下载
-            if (_steps == ESteps.TryAgain)
-            {
-                if (FailedTryAgain <= 0)
-                {
-                    Status = EOperationStatus.Failed;
-                    _steps = ESteps.Done;
-                    YooLogger.Error(Error);
-                    return;
-                }
-
-                _tryAgainTimer += Time.unscaledDeltaTime;
-                if (_tryAgainTimer > 1f)
-                {
-                    FailedTryAgain--;
-                    _steps = ESteps.CreateRequest;
-                    YooLogger.Warning(Error);
-                }
-            }
-        }
-        internal override void InternalAbort()
-        {
-            _steps = ESteps.Done;
-            DisposeWebRequest();
-        }
-
-        private void CreateWebRequest()
-        {
-            _webRequest = WXAssetBundle.GetAssetBundle(_requestURL);
-            _webRequest.disposeDownloadHandlerOnDispose = true;
-            _webRequest.SendWebRequest();
-        }
-        private void DisposeWebRequest()
-        {
-            if (_webRequest != null)
-            {
-                //注意：引擎底层会自动调用Abort方法
-                _webRequest.Dispose();
-                _webRequest = null;
-            }
-        }
-    }
-}
-#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/WechatFileSystem/Operation/internal/LoadWechatAssetBundleOperation.cs

@@ -0,0 +1,114 @@
+#if UNITY_WEBGL && WEIXINMINIGAME
+using UnityEngine;
+
+namespace YooAsset
+{
+    internal class LoadWechatAssetBundleOperation : LoadWebAssetBundleOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            CheckRequest,
+            TryAgain,
+            Done,
+        }
+
+        private readonly PackageBundle _bundle;
+        private readonly DownloadFileOptions _options;
+        private UnityWechatAssetBundleRequestOperation _unityWechatAssetBundleRequestOp;
+
+        private int _requestCount = 0;
+        private float _tryAgainTimer;
+        private int _failedTryAgain;
+        private ESteps _steps = ESteps.None;
+
+
+        internal LoadWechatAssetBundleOperation(PackageBundle bundle, DownloadFileOptions options)
+        {
+            _bundle = bundle;
+            _options = options;
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            // 创建下载器
+            if (_steps == ESteps.CreateRequest)
+            {
+                string url = GetRequestURL();
+                _unityWechatAssetBundleRequestOp = new UnityWechatAssetBundleRequestOperation(_bundle, url);
+                _unityWechatAssetBundleRequestOp.StartOperation();
+                AddChildOperation(_unityWechatAssetBundleRequestOp);
+                _steps = ESteps.CheckRequest;
+            }
+
+            // 检测下载结果
+            if (_steps == ESteps.CheckRequest)
+            {
+                _unityWechatAssetBundleRequestOp.UpdateOperation();
+                Progress = _unityWechatAssetBundleRequestOp.Progress;
+                DownloadProgress = _unityWechatAssetBundleRequestOp.DownloadProgress;
+                DownloadedBytes = (long)_unityWechatAssetBundleRequestOp.DownloadedBytes;
+                if (_unityWechatAssetBundleRequestOp.IsDone == false)
+                    return;
+
+                if (_unityWechatAssetBundleRequestOp.Status == EOperationStatus.Succeed)
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                    Result = _unityWechatAssetBundleRequestOp.Result;
+                }
+                else
+                {
+                    if (_failedTryAgain > 0)
+                    {
+                        _steps = ESteps.TryAgain;
+                        YooLogger.Warning($"Failed download : {_unityWechatAssetBundleRequestOp.URL} Try again !");
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = _unityWechatAssetBundleRequestOp.Error;
+                        YooLogger.Error(Error);
+                    }
+                }
+            }
+
+            // 重新尝试下载
+            if (_steps == ESteps.TryAgain)
+            {
+                _tryAgainTimer += Time.unscaledDeltaTime;
+                if (_tryAgainTimer > 1f)
+                {
+                    _tryAgainTimer = 0f;
+                    _failedTryAgain--;
+                    Progress = 0f;
+                    DownloadProgress = 0f;
+                    DownloadedBytes = 0;
+                    _steps = ESteps.CreateRequest;
+                }
+            }
+        }
+
+        /// <summary>
+        /// 获取网络请求地址
+        /// </summary>
+        protected string GetRequestURL()
+        {
+            // 轮流返回请求地址
+            _requestCount++;
+            if (_requestCount % 2 == 0)
+                return _options.FallbackURL;
+            else
+                return _options.MainURL;
+        }
+    }
+}
+#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/WechatFileSystem/Operation/internal/UnityWechatAssetBundleRequestOperation.cs

@@ -0,0 +1,96 @@
+#if UNITY_WEBGL && WEIXINMINIGAME
+using UnityEngine.Networking;
+using UnityEngine;
+using WeChatWASM;
+
+namespace YooAsset
+{
+    internal class UnityWechatAssetBundleRequestOperation : UnityWebRequestOperation
+    {
+        protected enum ESteps
+        {
+            None,
+            CreateRequest,
+            Download,
+            Done,
+        }
+
+        private readonly PackageBundle _packageBundle;
+        private UnityWebRequestAsyncOperation _requestOperation;
+        private ESteps _steps = ESteps.None;
+
+        /// <summary>
+        /// 请求结果
+        /// </summary>
+        public AssetBundle Result { private set; get; }
+
+        internal UnityWechatAssetBundleRequestOperation(PackageBundle bundle, string url) : base(url)
+        {
+            _packageBundle = bundle;
+        }
+        internal override void InternalStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            if (_steps == ESteps.CreateRequest)
+            {
+                CreateWebRequest();
+                _steps = ESteps.Download;
+            }
+
+            if (_steps == ESteps.Download)
+            {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
+                Progress = _requestOperation.progress;
+                if (_requestOperation.isDone == false)
+                    return;
+
+                if (CheckRequestResult())
+                {
+                    var downloadHanlder = (DownloadHandlerWXAssetBundle)_webRequest.downloadHandler;
+                    AssetBundle assetBundle = downloadHanlder.assetBundle;
+                    if (assetBundle == null)
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = $"URL : {_requestURL} Download handler asset bundle object is null !";
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Result = assetBundle;
+                        Status = EOperationStatus.Succeed;
+
+                        //TODO 解决微信小游戏插件问题
+                        // Issue : https://github.com/wechat-miniprogram/minigame-unity-webgl-transform/issues/108#
+                        DownloadProgress = 1f;
+                        DownloadedBytes = _packageBundle.FileSize;
+                        Progress = 1f;
+                    }
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                }
+
+                // 注意：最终释放请求器
+                DisposeRequest();
+            }
+        }
+
+        private void CreateWebRequest()
+        {
+            _webRequest = WXAssetBundle.GetAssetBundle(_requestURL);
+            _webRequest.disposeDownloadHandlerOnDispose = true;
+            _requestOperation = _webRequest.SendWebRequest();
+        }
+    }
+}
+#endif

Assets/YooAsset/Samples~/Mini Game/Runtime/WechatFileSystem/Operation/internal/UnityWechatAssetBundleRequestOperation.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 8dd1f15e52120ad409285fa3e21c7d30
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Samples~/Mini Game/Runtime/WechatFileSystem/WechatFileSystem.cs

@@ -151,8 +151,9 @@ internal class WechatFileSystem : IFileSystem
     }
     public virtual FSDownloadFileOperation DownloadFileAsync(PackageBundle bundle, DownloadFileOptions options)
     {
-        options.MainURL = RemoteServices.GetRemoteMainURL(bundle.FileName);
+        string mainURL = RemoteServices.GetRemoteMainURL(bundle.FileName);
-        options.FallbackURL = RemoteServices.GetRemoteFallbackURL(bundle.FileName);
+        string fallbackURL = RemoteServices.GetRemoteFallbackURL(bundle.FileName);
+        options.SetURL(mainURL, fallbackURL);
         var operation = new WXFSDownloadFileOperation(this, bundle, options);
         return operation;
     }

Assets/YooAsset/Samples~/Mini Game/Runtime/YooAsset.MiniGame.asmdef

@@ -4,7 +4,8 @@
     "references": [
         "GUID:e34a5702dd353724aa315fb8011f08c3",
         "GUID:5efd170ecd8084500bed5692932fe14e",
-        "GUID:bb21d6197862c4c3e863390dec9859a7"
+        "GUID:bb21d6197862c4c3e863390dec9859a7",
+        "GUID:870f26a2ffa82429195df0861505c5d5"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],

Assets/YooAsset/Samples~/Test Sample/Runtime/CryptoSample.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 4ce11d98eccfa4b44bf2c82f7d87d105
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Samples~/Test Sample/Runtime/CryptoSample/TestFileOffsetEncryption.cs

@@ -0,0 +1,94 @@
+using System;
+using System.IO;
+using System.Text;
+using System.Collections;
+using UnityEngine;
+using YooAsset;
+
+/// <summary>
+/// 文件偏移加密方式
+/// </summary>
+public class TestFileOffsetEncryption : IEncryptionServices
+{
+    public EncryptResult Encrypt(EncryptFileInfo fileInfo)
+    {
+        // 说明：对TestRes3资源目录进行加密
+        if (fileInfo.BundleName.Contains("_testres3_"))
+        {
+            int offset = 32;
+            byte[] fileData = File.ReadAllBytes(fileInfo.FileLoadPath);
+            var encryptedData = new byte[fileData.Length + offset];
+            Buffer.BlockCopy(fileData, 0, encryptedData, offset, fileData.Length);
+
+            EncryptResult result = new EncryptResult();
+            result.Encrypted = true;
+            result.EncryptedData = encryptedData;
+            return result;
+        }
+        else
+        {
+            EncryptResult result = new EncryptResult();
+            result.Encrypted = false;
+            return result;
+        }
+    }
+}
+
+/// <summary>
+/// 资源文件偏移解密类
+/// </summary>
+public class TestFileOffsetDecryption : IDecryptionServices
+{
+    /// <summary>
+    /// 同步方式获取解密的资源包对象
+    /// 注意：加载流对象在资源包对象释放的时候会自动释放
+    /// </summary>
+    DecryptResult IDecryptionServices.LoadAssetBundle(DecryptFileInfo fileInfo)
+    {
+        DecryptResult decryptResult = new DecryptResult();
+        decryptResult.ManagedStream = null;
+        decryptResult.Result = AssetBundle.LoadFromFile(fileInfo.FileLoadPath, fileInfo.FileLoadCRC, GetFileOffset());
+        return decryptResult;
+    }
+
+    /// <summary>
+    /// 异步方式获取解密的资源包对象
+    /// 注意：加载流对象在资源包对象释放的时候会自动释放
+    /// </summary>
+    DecryptResult IDecryptionServices.LoadAssetBundleAsync(DecryptFileInfo fileInfo)
+    {
+        DecryptResult decryptResult = new DecryptResult();
+        decryptResult.ManagedStream = null;
+        decryptResult.CreateRequest = AssetBundle.LoadFromFileAsync(fileInfo.FileLoadPath, fileInfo.FileLoadCRC, GetFileOffset());
+        return decryptResult;
+    }
+
+    /// <summary>
+    /// 后备方式获取解密的资源包对象
+    /// </summary>
+    DecryptResult IDecryptionServices.LoadAssetBundleFallback(DecryptFileInfo fileInfo)
+    {
+        return new DecryptResult();
+    }
+
+    /// <summary>
+    /// 获取解密的字节数据
+    /// </summary>
+    byte[] IDecryptionServices.ReadFileData(DecryptFileInfo fileInfo)
+    {
+        throw new System.NotImplementedException();
+    }
+
+    /// <summary>
+    /// 获取解密的文本数据
+    /// </summary>
+    string IDecryptionServices.ReadFileText(DecryptFileInfo fileInfo)
+    {
+        throw new System.NotImplementedException();
+    }
+
+    private static ulong GetFileOffset()
+    {
+        return 32;
+    }
+}