update runtime code

Assets/YooAsset/Runtime/AssetsPackage.cs

@@ -90,7 +90,7 @@ namespace YooAsset
 				_assetSystemImpl.Initialize(PackageName, true, parameters.AssetLoadingMaxNumber, parameters.DecryptionServices, _bundleServices);
 
 				var initializeParameters = parameters as EditorSimulateModeParameters;
-				initializeOperation = editorSimulateModeImpl.InitializeAsync(PackageName, initializeParameters.LocationToLower, initializeParameters.SimulatePatchManifestPath);
+				initializeOperation = editorSimulateModeImpl.InitializeAsync(initializeParameters.LocationToLower, initializeParameters.SimulatePatchManifestPath);
 			}
 			else if (_playMode == EPlayMode.OfflinePlayMode)
 			{
@@ -219,12 +219,23 @@ namespace YooAsset
 		}
 
 		/// <summary>
-		/// 检查包裹内容的完整性
+		/// 预下载指定版本的包裹资源
 		/// </summary>
-		public CheckContentsIntegrityOperation CheckContentsIntegrityAsync()
+		/// <param name="packageVersion">下载的包裹版本</param>
+		/// <param name="timeout">超时时间（默认值：60秒）</param>
+		public PreDownloadPackageOperation PreDownloadPackageAsync(string packageVersion, int timeout = 60)
 		{
 			DebugCheckInitialize();
-			return _playModeServices.CheckContentsIntegrityAsync();
+			return _playModeServices.PreDownloadPackageAsync(packageVersion, timeout);
+		}
+
+		/// <summary>
+		/// 检查包裹内容的完整性
+		/// </summary>
+		public CheckPackageContentsOperation CheckPackageContentsAsync(string packageVersion)
+		{
+			DebugCheckInitialize();
+			return _playModeServices.CheckPackageContentsOperation(packageVersion);
 		}
 
 		/// <summary>

Assets/YooAsset/Runtime/PatchSystem/Operations/CheckPackageContentsOperation.cs

@@ -8,13 +8,13 @@ namespace YooAsset
 	/// <summary>
 	/// 检查包裹内容的完整性
 	/// </summary>
-	public abstract class CheckContentsIntegrityOperation : AsyncOperationBase
+	public abstract class CheckPackageContentsOperation : AsyncOperationBase
 	{
 	}
 
-	internal sealed class EditorSimulateModeCheckContentsIntegrityOperation : CheckContentsIntegrityOperation
+	internal sealed class EditorSimulateModeCheckPackageContentsOperation : CheckPackageContentsOperation
 	{
-		internal EditorSimulateModeCheckContentsIntegrityOperation()
+		internal EditorSimulateModeCheckPackageContentsOperation()
 		{
 		}
 		internal override void Start()
@@ -25,9 +25,9 @@ namespace YooAsset
 		{
 		}
 	}
-	internal sealed class OfflinePlayModeCheckContentsIntegrityOperation : CheckContentsIntegrityOperation
+	internal sealed class OfflinePlayModeCheckPackageContentsOperation : CheckPackageContentsOperation
 	{
-		internal OfflinePlayModeCheckContentsIntegrityOperation()
+		internal OfflinePlayModeCheckPackageContentsOperation()
 		{
 		}
 		internal override void Start()
@@ -38,54 +38,83 @@ namespace YooAsset
 		{
 		}
 	}
-	internal sealed class HostPlayModeCheckContentsIntegrityOperation : CheckContentsIntegrityOperation
+	internal sealed class HostPlayModeCheckPackageContentsOperation : CheckPackageContentsOperation
 	{
 		private enum ESteps
 		{
 			None,
-			CheckLoadedManifest,
+			CheckActiveManifest,
+			LoadCacheManifest,
 			VerifyPackage,
 			Done,
 		}
 
 		private readonly HostPlayModeImpl _impl;
 		private readonly string _packageName;
+		private readonly string _packageVersion;
+		private LoadCacheManifestOperation _loadCacheManifestOp;
 		private VerifyPackageOperation _verifyOperation;
+		private PatchManifest _verifyManifest;
 		private ESteps _steps = ESteps.None;
 
-		internal HostPlayModeCheckContentsIntegrityOperation(HostPlayModeImpl impl, string packageName)
+		internal HostPlayModeCheckPackageContentsOperation(HostPlayModeImpl impl, string packageName, string packageVersion)
 		{
 			_impl = impl;
 			_packageName = packageName;
+			_packageVersion = packageVersion;
 		}
 		internal override void Start()
 		{
-			_steps = ESteps.CheckLoadedManifest;
+			_steps = ESteps.CheckActiveManifest;
 		}
 		internal override void Update()
 		{
 			if (_steps == ESteps.None || _steps == ESteps.Done)
 				return;
 
-			if (_steps == ESteps.CheckLoadedManifest)
+			if (_steps == ESteps.CheckActiveManifest)
 			{
-				if (_impl.ActiveManifest == null)
+				// 检测当前激活的清单对象
+				if (_impl.ActiveManifest != null && _impl.ActiveManifest.PackageVersion == _packageVersion)
 				{
-					_steps = ESteps.Done;
+					_verifyManifest = _impl.ActiveManifest;
-					Status = EOperationStatus.Failed;
+					_steps = ESteps.VerifyPackage;
-					Error = $"Not found loaded package : {_packageName}";
 				}
 				else
 				{
+					_steps = ESteps.LoadCacheManifest;
+				}
+			}
+
+			if (_steps == ESteps.LoadCacheManifest)
+			{
+				if (_loadCacheManifestOp == null)
+				{
+					_loadCacheManifestOp = new LoadCacheManifestOperation(_packageName, _packageVersion);
+					OperationSystem.StartOperation(_loadCacheManifestOp);
+				}
+
+				if (_loadCacheManifestOp.IsDone == false)
+					return;
+
+				if (_loadCacheManifestOp.Status == EOperationStatus.Succeed)
+				{
+					_verifyManifest = _loadCacheManifestOp.Manifest;
 					_steps = ESteps.VerifyPackage;
 				}
+				else
+				{
+					_steps = ESteps.Done;
+					Status = EOperationStatus.Failed;
+					Error = _loadCacheManifestOp.Error;
+				}
 			}
 
 			if (_steps == ESteps.VerifyPackage)
 			{
 				if (_verifyOperation == null)
 				{
-					_verifyOperation = VerifyPackageOperation.CreateOperation(_impl.ActiveManifest, _impl);
+					_verifyOperation = VerifyPackageOperation.CreateOperation(_verifyManifest, _impl);
 					OperationSystem.StartOperation(_verifyOperation);
 				}
 

Assets/YooAsset/Runtime/PatchSystem/Operations/InitializationOperation.cs

@@ -184,8 +184,7 @@ namespace YooAsset
 			QueryCachePackageVersion,
 			TryLoadCacheManifest,
 			QueryBuildinPackageVersion,
-			CopyBuildinPackageHash,
+			UnpackBuildinManifest,
-			CopyBuildinManifest,
 			LoadBuildinManifest,
 			VerifyPackage,
 			Done,
@@ -195,8 +194,7 @@ namespace YooAsset
 		private readonly string _packageName;
 		private QueryBuildinPackageVersionOperation _queryBuildinPackageVersionOp;
 		private QueryCachePackageVersionOperation _queryCachePackageVersionOp;
-		private CopyBuildinPackageHashOperation _copyBuildinPackageHashOp;
+		private UnpackBuildinManifestOperation _unpackBuildinManifestOp;
-		private CopyBuildinManifestOperation _copyBuildinManifestOp;
 		private LoadBuildinManifestOperation _loadBuildinManifestOp;
 		private LoadCacheManifestOperation _loadCacheManifestOp;
 		private VerifyPackageOperation _verifyOperation;
@@ -289,7 +287,7 @@ namespace YooAsset
 				// 注意：为了兼容MOD模式，初始化动态新增的包裹的时候，如果内置清单不存在也不需要报错！
 				if (_queryBuildinPackageVersionOp.Status == EOperationStatus.Succeed)
 				{
-					_steps = ESteps.CopyBuildinPackageHash;
+					_steps = ESteps.UnpackBuildinManifest;
 				}
 				else
 				{
@@ -300,41 +298,18 @@ namespace YooAsset
 				}
 			}
 
-			if (_steps == ESteps.CopyBuildinPackageHash)
+			if (_steps == ESteps.UnpackBuildinManifest)
 			{
-				if (_copyBuildinPackageHashOp == null)
+				if (_unpackBuildinManifestOp == null)
 				{
-					_copyBuildinPackageHashOp = new CopyBuildinPackageHashOperation(_packageName, _queryBuildinPackageVersionOp.PackageVersion);
+					_unpackBuildinManifestOp = new UnpackBuildinManifestOperation(_packageName, _queryBuildinPackageVersionOp.PackageVersion);
-					OperationSystem.StartOperation(_copyBuildinPackageHashOp);
+					OperationSystem.StartOperation(_unpackBuildinManifestOp);
 				}
 
-				if (_copyBuildinPackageHashOp.IsDone == false)
+				if (_unpackBuildinManifestOp.IsDone == false)
 					return;
 
-				if (_copyBuildinPackageHashOp.Status == EOperationStatus.Succeed)
+				if (_unpackBuildinManifestOp.Status == EOperationStatus.Succeed)
-				{
-					_steps = ESteps.CopyBuildinManifest;
-				}
-				else
-				{
-					_steps = ESteps.Done;
-					Status = EOperationStatus.Failed;
-					Error = _copyBuildinPackageHashOp.Error;
-				}
-			}
-
-			if (_steps == ESteps.CopyBuildinManifest)
-			{
-				if (_copyBuildinManifestOp == null)
-				{
-					_copyBuildinManifestOp = new CopyBuildinManifestOperation(_packageName, _queryBuildinPackageVersionOp.PackageVersion);
-					OperationSystem.StartOperation(_copyBuildinManifestOp);
-				}
-
-				if (_copyBuildinManifestOp.IsDone == false)
-					return;
-
-				if (_copyBuildinManifestOp.Status == EOperationStatus.Succeed)
 				{
 					_steps = ESteps.LoadBuildinManifest;
 				}
@@ -342,7 +317,7 @@ namespace YooAsset
 				{
 					_steps = ESteps.Done;
 					Status = EOperationStatus.Failed;
-					Error = _copyBuildinManifestOp.Error;
+					Error = _unpackBuildinManifestOp.Error;
 				}
 			}
 

Assets/YooAsset/Runtime/PatchSystem/Operations/Internal/CopyBuildinManifestOperation.cs

@@ -1,63 +0,0 @@
-
-namespace YooAsset
-{
-	internal class CopyBuildinManifestOperation : AsyncOperationBase
-	{
-		private enum ESteps
-		{
-			None,
-			CopyBuildinManifestFile,
-			Done,
-		}
-
-		private readonly string _buildinPackageName;
-		private readonly string _buildinPackageVersion;
-		private UnityWebFileRequester _downloader;
-		private ESteps _steps = ESteps.None;
-
-		public CopyBuildinManifestOperation(string buildinPackageName, string buildinPackageVersion)
-		{
-			_buildinPackageName = buildinPackageName;
-			_buildinPackageVersion = buildinPackageVersion;
-		}
-		internal override void Start()
-		{
-			_steps = ESteps.CopyBuildinManifestFile;
-		}
-		internal override void Update()
-		{
-			if (_steps == ESteps.None || _steps == ESteps.Done)
-				return;
-
-			if (_steps == ESteps.CopyBuildinManifestFile)
-			{
-				if (_downloader == null)
-				{
-					string savePath = PersistentHelper.GetCacheManifestFilePath(_buildinPackageName, _buildinPackageVersion);
-					string fileName = YooAssetSettingsData.GetManifestBinaryFileName(_buildinPackageName, _buildinPackageVersion);
-					string filePath = PathHelper.MakeStreamingLoadPath(fileName);
-					string url = PathHelper.ConvertToWWWPath(filePath);
-					_downloader = new UnityWebFileRequester();
-					_downloader.SendRequest(url, savePath);
-				}
-
-				if (_downloader.IsDone() == false)
-					return;
-
-				if (_downloader.HasError())
-				{
-					_steps = ESteps.Done;
-					Status = EOperationStatus.Failed;
-					Error = _downloader.GetError();
-				}
-				else
-				{
-					_steps = ESteps.Done;
-					Status = EOperationStatus.Succeed;
-				}
-
-				_downloader.Dispose();
-			}
-		}
-	}
-}

Assets/YooAsset/Runtime/PatchSystem/Operations/Internal/CopyBuildinPackageHashOperation.cs

@@ -1,63 +0,0 @@
-
-namespace YooAsset
-{
-	internal class CopyBuildinPackageHashOperation : AsyncOperationBase
-	{
-		private enum ESteps
-		{
-			None,
-			CopyBuildinPackageHashFile,
-			Done,
-		}
-
-		private readonly string _buildinPackageName;
-		private readonly string _buildinPackageVersion;
-		private UnityWebFileRequester _downloader;
-		private ESteps _steps = ESteps.None;
-
-		public CopyBuildinPackageHashOperation(string buildinPackageName, string buildinPackageVersion)
-		{
-			_buildinPackageName = buildinPackageName;
-			_buildinPackageVersion = buildinPackageVersion;
-		}
-		internal override void Start()
-		{
-			_steps = ESteps.CopyBuildinPackageHashFile;
-		}
-		internal override void Update()
-		{
-			if (_steps == ESteps.None || _steps == ESteps.Done)
-				return;
-
-			if (_steps == ESteps.CopyBuildinPackageHashFile)
-			{
-				if (_downloader == null)
-				{
-					string savePath = PersistentHelper.GetCachePackageHashFilePath(_buildinPackageName, _buildinPackageVersion);
-					string fileName = YooAssetSettingsData.GetPackageHashFileName(_buildinPackageName, _buildinPackageVersion);
-					string filePath = PathHelper.MakeStreamingLoadPath(fileName);
-					string url = PathHelper.ConvertToWWWPath(filePath);
-					_downloader = new UnityWebFileRequester();
-					_downloader.SendRequest(url, savePath);
-				}
-
-				if (_downloader.IsDone() == false)
-					return;
-
-				if (_downloader.HasError())
-				{
-					_steps = ESteps.Done;
-					Status = EOperationStatus.Failed;
-					Error = _downloader.GetError();
-				}
-				else
-				{
-					_steps = ESteps.Done;
-					Status = EOperationStatus.Succeed;
-				}
-
-				_downloader.Dispose();
-			}
-		}
-	}
-}

Assets/YooAsset/Runtime/PatchSystem/Operations/Internal/DownloadManifestOperation.cs

@@ -6,8 +6,8 @@ namespace YooAsset
 		private enum ESteps
 		{
 			None,
-			DownloadPackageHash,
+			DownloadPackageHashFile,
-			DownloadManifest,
+			DownloadManifestFile,
 			Done,
 		}
 
@@ -30,14 +30,14 @@ namespace YooAsset
 		internal override void Start()
 		{
 			RequestCount++;
-			_steps = ESteps.DownloadPackageHash;
+			_steps = ESteps.DownloadPackageHashFile;
 		}
 		internal override void Update()
 		{
 			if (_steps == ESteps.None || _steps == ESteps.Done)
 				return;
 
-			if (_steps == ESteps.DownloadPackageHash)
+			if (_steps == ESteps.DownloadPackageHashFile)
 			{
 				if (_downloader1 == null)
 				{
@@ -61,13 +61,13 @@ namespace YooAsset
 				}
 				else
 				{
-					_steps = ESteps.DownloadManifest;
+					_steps = ESteps.DownloadManifestFile;
 				}
 
 				_downloader1.Dispose();
 			}
 
-			if (_steps == ESteps.DownloadManifest)
+			if (_steps == ESteps.DownloadManifestFile)
 			{
 				if (_downloader2 == null)
 				{

Assets/YooAsset/Runtime/PatchSystem/Operations/Internal/QueryRemotePackageVersionOperation.cs

@@ -0,0 +1,103 @@
+using System.IO;
+
+namespace YooAsset
+{
+	internal class QueryRemotePackageVersionOperation : AsyncOperationBase
+	{
+		private enum ESteps
+		{
+			None,
+			DownloadPackageVersion,
+			Done,
+		}
+
+		private static int RequestCount = 0;
+		private readonly HostPlayModeImpl _impl;
+		private readonly string _packageName;
+		private readonly bool _appendTimeTicks;
+		private readonly int _timeout;
+		private UnityWebDataRequester _downloader;
+		private ESteps _steps = ESteps.None;
+
+		/// <summary>
+		/// 包裹版本
+		/// </summary>
+		public string PackageVersion { private set; get; }
+		
+
+		public QueryRemotePackageVersionOperation(HostPlayModeImpl impl, string packageName, bool appendTimeTicks, int timeout)
+		{
+			_impl = impl;
+			_packageName = packageName;
+			_appendTimeTicks = appendTimeTicks;
+			_timeout = timeout;
+		}
+		internal override void Start()
+		{
+			RequestCount++;
+			_steps = ESteps.DownloadPackageVersion;
+		}
+		internal override void Update()
+		{
+			if (_steps == ESteps.None || _steps == ESteps.Done)
+				return;
+
+			if (_steps == ESteps.DownloadPackageVersion)
+			{
+				if (_downloader == null)
+				{
+					string fileName = YooAssetSettingsData.GetPackageVersionFileName(_packageName);
+					string webURL = GetPackageVersionRequestURL(fileName);
+					YooLogger.Log($"Beginning to request package version : {webURL}");
+					_downloader = new UnityWebDataRequester();
+					_downloader.SendRequest(webURL, _timeout);
+				}
+
+				Progress = _downloader.Progress();
+				if (_downloader.IsDone() == false)
+					return;
+
+				if (_downloader.HasError())
+				{
+					_steps = ESteps.Done;
+					Status = EOperationStatus.Failed;
+					Error = _downloader.GetError();
+				}
+				else
+				{
+					PackageVersion = _downloader.GetText();
+					if (string.IsNullOrEmpty(PackageVersion))
+					{
+						_steps = ESteps.Done;
+						Status = EOperationStatus.Failed;
+						Error = $"Remote package version is empty : {_downloader.URL}";
+					}
+					else
+					{
+						_steps = ESteps.Done;
+						Status = EOperationStatus.Succeed;
+					}
+				}
+
+				_downloader.Dispose();
+			}
+		}
+
+		private string GetPackageVersionRequestURL(string fileName)
+		{
+			string url;
+
+			// 轮流返回请求地址
+			if (RequestCount % 2 == 0)
+				url = _impl.GetPatchDownloadFallbackURL(fileName);
+			else
+				url = _impl.GetPatchDownloadMainURL(fileName);
+
+			// 在URL末尾添加时间戳
+			if (_appendTimeTicks)
+				return $"{url}?{System.DateTime.UtcNow.Ticks}";
+			else
+				return url;
+		}
+	}
+}

Assets/YooAsset/Runtime/PatchSystem/Operations/Internal/QueryRemotePackageVersionOperation.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: bb073431e4f3b434e8431b3a8a808dfb
+guid: 1d702a1a39789a34da99cbb854708b82
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Assets/YooAsset/Runtime/PatchSystem/Operations/Internal/UnpackBuildinManifestOperation.cs

@@ -0,0 +1,94 @@
+
+namespace YooAsset
+{
+	internal class UnpackBuildinManifestOperation : AsyncOperationBase
+	{
+		private enum ESteps
+		{
+			None,
+			UnpackManifestHashFile,
+			UnpackManifestFile,
+			Done,
+		}
+
+		private readonly string _buildinPackageName;
+		private readonly string _buildinPackageVersion;
+		private UnityWebFileRequester _downloader1;
+		private UnityWebFileRequester _downloader2;
+		private ESteps _steps = ESteps.None;
+
+		public UnpackBuildinManifestOperation(string buildinPackageName, string buildinPackageVersion)
+		{
+			_buildinPackageName = buildinPackageName;
+			_buildinPackageVersion = buildinPackageVersion;
+		}
+		internal override void Start()
+		{
+			_steps = ESteps.UnpackManifestHashFile;
+		}
+		internal override void Update()
+		{
+			if (_steps == ESteps.None || _steps == ESteps.Done)
+				return;
+
+			if(_steps == ESteps.UnpackManifestHashFile)
+			{
+				if (_downloader1 == null)
+				{
+					string savePath = PersistentHelper.GetCachePackageHashFilePath(_buildinPackageName, _buildinPackageVersion);
+					string fileName = YooAssetSettingsData.GetPackageHashFileName(_buildinPackageName, _buildinPackageVersion);
+					string filePath = PathHelper.MakeStreamingLoadPath(fileName);
+					string url = PathHelper.ConvertToWWWPath(filePath);
+					_downloader1 = new UnityWebFileRequester();
+					_downloader1.SendRequest(url, savePath);
+				}
+
+				if (_downloader1.IsDone() == false)
+					return;
+
+				if (_downloader1.HasError())
+				{
+					_steps = ESteps.Done;
+					Status = EOperationStatus.Failed;
+					Error = _downloader1.GetError();
+				}
+				else
+				{
+					_steps = ESteps.UnpackManifestFile;
+				}
+
+				_downloader1.Dispose();
+			}
+
+			if (_steps == ESteps.UnpackManifestFile)
+			{
+				if (_downloader2 == null)
+				{
+					string savePath = PersistentHelper.GetCacheManifestFilePath(_buildinPackageName, _buildinPackageVersion);
+					string fileName = YooAssetSettingsData.GetManifestBinaryFileName(_buildinPackageName, _buildinPackageVersion);
+					string filePath = PathHelper.MakeStreamingLoadPath(fileName);
+					string url = PathHelper.ConvertToWWWPath(filePath);
+					_downloader2 = new UnityWebFileRequester();
+					_downloader2.SendRequest(url, savePath);
+				}
+
+				if (_downloader2.IsDone() == false)
+					return;
+
+				if (_downloader2.HasError())
+				{
+					_steps = ESteps.Done;
+					Status = EOperationStatus.Failed;
+					Error = _downloader2.GetError();
+				}
+				else
+				{
+					_steps = ESteps.Done;
+					Status = EOperationStatus.Succeed;
+				}
+
+				_downloader2.Dispose();
+			}
+		}
+	}
+}

Assets/YooAsset/Runtime/PatchSystem/Operations/PreDownloadPackageOperation.cs

@@ -64,7 +64,6 @@ namespace YooAsset
 		{
 		}
 	}
-
 	public class OfflinePlayModePreDownloadPackageOperation : PreDownloadPackageOperation
 	{
 		internal override void Start()
@@ -75,7 +74,6 @@ namespace YooAsset
 		{
 		}
 	}
-
 	public class HostPlayModePreDownloadPackageOperation : PreDownloadPackageOperation
 	{
 		private enum ESteps

Assets/YooAsset/Runtime/PatchSystem/Operations/UpdatePackageManifestOperation.cs

@@ -47,7 +47,7 @@ namespace YooAsset
 
 	/// <summary>
 	/// 联机模式的更新清单操作
-	/// 注意：优先比对沙盒清单哈希值，如果有变化就更新远端清单文件，并保存到本地。
+	/// 注意：优先加载沙盒里缓存的清单文件，如果有变化就更新远端清单文件，并保存到本地。
 	/// </summary>
 	internal sealed class HostPlayModeUpdatePackageManifestOperation : UpdatePackageManifestOperation
 	{
@@ -93,16 +93,15 @@ namespace YooAsset
 			if (_steps == ESteps.CheckActiveManifest)
 			{
 				// 检测当前激活的清单对象	
-				if (_impl.ActiveManifest != null)
+				if (_impl.ActiveManifest != null && _impl.ActiveManifest.PackageVersion == _packageVersion)
 				{
-					if (_impl.ActiveManifest.PackageVersion == _packageVersion)
+					_steps = ESteps.Done;
-					{
+					Status = EOperationStatus.Succeed;
-						_steps = ESteps.Done;
+				}
-						Status = EOperationStatus.Succeed;
+				else
-						return;
+				{
-					}
+					_steps = ESteps.TryLoadCacheManifest;
 				}
-				_steps = ESteps.TryLoadCacheManifest;
 			}
 
 			if (_steps == ESteps.TryLoadCacheManifest)

Assets/YooAsset/Runtime/PatchSystem/Operations/UpdatePackageVersionOperation.cs

@@ -51,16 +51,15 @@ namespace YooAsset
 		private enum ESteps
 		{
 			None,
-			DownloadPackageVersion,
+			QueryRemotePackageVersion,
 			Done,
 		}
 
-		private static int RequestCount = 0;
 		private readonly HostPlayModeImpl _impl;
 		private readonly string _packageName;
 		private readonly bool _appendTimeTicks;
 		private readonly int _timeout;
-		private UnityWebDataRequester _downloader;
+		private QueryRemotePackageVersionOperation _queryRemotePackageVersionOp;
 		private ESteps _steps = ESteps.None;
 
 		internal HostPlayModeUpdatePackageVersionOperation(HostPlayModeImpl impl, string packageName, bool appendTimeTicks, int timeout)
@@ -72,70 +71,37 @@ namespace YooAsset
 		}
 		internal override void Start()
 		{
-			RequestCount++;
+			_steps = ESteps.QueryRemotePackageVersion;
-			_steps = ESteps.DownloadPackageVersion;
 		}
 		internal override void Update()
 		{
 			if (_steps == ESteps.None || _steps == ESteps.Done)
 				return;
 
-			if (_steps == ESteps.DownloadPackageVersion)
+			if (_steps == ESteps.QueryRemotePackageVersion)
 			{
-				if (_downloader == null)
+				if (_queryRemotePackageVersionOp == null)
 				{
-					string fileName = YooAssetSettingsData.GetPackageVersionFileName(_packageName);
+					_queryRemotePackageVersionOp = new QueryRemotePackageVersionOperation(_impl, _packageName, _appendTimeTicks, _timeout);
-					string webURL = GetPackageVersionRequestURL(fileName);
+					OperationSystem.StartOperation(_queryRemotePackageVersionOp);
-					YooLogger.Log($"Beginning to request package version : {webURL}");
-					_downloader = new UnityWebDataRequester();
-					_downloader.SendRequest(webURL, _timeout);
 				}
 
-				Progress = _downloader.Progress();
+				if (_queryRemotePackageVersionOp.IsDone == false)
-				if (_downloader.IsDone() == false)
 					return;
 
-				if (_downloader.HasError())
+				if (_queryRemotePackageVersionOp.Status == EOperationStatus.Succeed)
 				{
+					PackageVersion = _queryRemotePackageVersionOp.PackageVersion;
 					_steps = ESteps.Done;
-					Status = EOperationStatus.Failed;
+					Status = EOperationStatus.Succeed;
-					Error = _downloader.GetError();
 				}
 				else
 				{
-					PackageVersion = _downloader.GetText();
+					_steps = ESteps.Done;
-					if (string.IsNullOrEmpty(PackageVersion))
+					Status = EOperationStatus.Failed;
-					{
+					Error = _queryRemotePackageVersionOp.Error;
-						_steps = ESteps.Done;
-						Status = EOperationStatus.Failed;
-						Error = $"Package version is empty : {_downloader.URL}";
-					}
-					else
-					{
-						_steps = ESteps.Done;
-						Status = EOperationStatus.Succeed;
-					}
 				}
-
-				_downloader.Dispose();
 			}
 		}
-
-		private string GetPackageVersionRequestURL(string fileName)
-		{
-			string url;
-
-			// 轮流返回请求地址
-			if (RequestCount % 2 == 0)
-				url = _impl.GetPatchDownloadFallbackURL(fileName);
-			else
-				url = _impl.GetPatchDownloadMainURL(fileName);
-
-			// 在URL末尾添加时间戳
-			if (_appendTimeTicks)
-				return $"{url}?{System.DateTime.UtcNow.Ticks}";
-			else
-				return url;
-		}
 	}
 }

Assets/YooAsset/Runtime/PatchSystem/PlayMode/EditorSimulateModeImpl.cs

@@ -7,15 +7,13 @@ namespace YooAsset
 	internal class EditorSimulateModeImpl : IPlayModeServices, IBundleServices
 	{
 		private PatchManifest _activeManifest;
-		private string _packageName;
 		private bool _locationToLower;
 
 		/// <summary>
 		/// 异步初始化
 		/// </summary>
-		public InitializationOperation InitializeAsync(string packageName, bool locationToLower, string simulatePatchManifestPath)
+		public InitializationOperation InitializeAsync(bool locationToLower, string simulatePatchManifestPath)
 		{
-			_packageName = packageName;
 			_locationToLower = locationToLower;
 			var operation = new EditorSimulateModeInitializationOperation(this, simulatePatchManifestPath);
 			OperationSystem.StartOperation(operation);
@@ -52,9 +50,15 @@ namespace YooAsset
 			OperationSystem.StartOperation(operation);
 			return operation;
 		}
-		CheckContentsIntegrityOperation IPlayModeServices.CheckContentsIntegrityAsync()
+		PreDownloadPackageOperation IPlayModeServices.PreDownloadPackageAsync(string packageVersion, int timeout)
 		{
-			var operation = new EditorSimulateModeCheckContentsIntegrityOperation();
+			var operation = new EditorPlayModePreDownloadPackageOperation();
+			OperationSystem.StartOperation(operation);
+			return operation;
+		}
+		CheckPackageContentsOperation IPlayModeServices.CheckPackageContentsOperation(string packageVersion)
+		{
+			var operation = new EditorSimulateModeCheckPackageContentsOperation();
 			OperationSystem.StartOperation(operation);
 			return operation;
 		}

Assets/YooAsset/Runtime/PatchSystem/PlayMode/HostPlayModeImpl.cs

@@ -110,9 +110,15 @@ namespace YooAsset
 			OperationSystem.StartOperation(operation);
 			return operation;
 		}
-		CheckContentsIntegrityOperation IPlayModeServices.CheckContentsIntegrityAsync()
+		PreDownloadPackageOperation IPlayModeServices.PreDownloadPackageAsync(string packageVersion, int timeout)
 		{
-			var operation = new HostPlayModeCheckContentsIntegrityOperation(this, _packageName);
+			var operation = new HostPlayModePreDownloadPackageOperation(this, _packageName, packageVersion, timeout);
+			OperationSystem.StartOperation(operation);
+			return operation;
+		}
+		CheckPackageContentsOperation IPlayModeServices.CheckPackageContentsOperation(string packageVersion)
+		{
+			var operation = new HostPlayModeCheckPackageContentsOperation(this, _packageName, packageVersion);
 			OperationSystem.StartOperation(operation);
 			return operation;
 		}

Assets/YooAsset/Runtime/PatchSystem/PlayMode/OfflinePlayModeImpl.cs

@@ -7,7 +7,6 @@ namespace YooAsset
 	internal class OfflinePlayModeImpl : IPlayModeServices, IBundleServices
 	{
 		private PatchManifest _activeManifest;
-		private string _packageName;
 		private bool _locationToLower;
 
 		/// <summary>
@@ -15,7 +14,6 @@ namespace YooAsset
 		/// </summary>
 		public InitializationOperation InitializeAsync(string packageName, bool locationToLower)
 		{
-			_packageName = packageName;
 			_locationToLower = locationToLower;
 			var operation = new OfflinePlayModeInitializationOperation(this, packageName);
 			OperationSystem.StartOperation(operation);
@@ -52,9 +50,15 @@ namespace YooAsset
 			OperationSystem.StartOperation(operation);
 			return operation;
 		}
-		CheckContentsIntegrityOperation IPlayModeServices.CheckContentsIntegrityAsync()
+		PreDownloadPackageOperation IPlayModeServices.PreDownloadPackageAsync(string packageVersion, int timeout)
 		{
-			var operation = new OfflinePlayModeCheckContentsIntegrityOperation();
+			var operation = new OfflinePlayModePreDownloadPackageOperation();
+			OperationSystem.StartOperation(operation);
+			return operation;
+		}
+		CheckPackageContentsOperation IPlayModeServices.CheckPackageContentsOperation(string packageVersion)
+		{
+			var operation = new OfflinePlayModeCheckPackageContentsOperation();
 			OperationSystem.StartOperation(operation);
 			return operation;
 		}

Assets/YooAsset/Runtime/Services/IPlayModeServices.cs

@@ -23,10 +23,15 @@ namespace YooAsset
 		/// </summary>
 		UpdatePackageManifestOperation UpdatePackageManifestAsync(string packageVersion, int timeout);
 
+		/// <summary>
+		/// 预下载指定版本的包裹资源
+		/// </summary>
+		PreDownloadPackageOperation PreDownloadPackageAsync(string packageVersion, int timeout);
+
 		/// <summary>
 		/// 检查包裹内容的完整性
 		/// </summary>
-		CheckContentsIntegrityOperation CheckContentsIntegrityAsync();
+		CheckPackageContentsOperation CheckPackageContentsOperation(string packageVersion);
 
 		// 下载相关
 		PatchDownloaderOperation CreatePatchDownloaderByAll(int downloadingMaxNumber, int failedTryAgain, int timeout);