Init TEngine4.0.0

Init TEngine4.0.0

UnityProject/Packages/YooAsset/Runtime/DownloadSystem/DownloadSystem.cs

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+using System;
+using System.IO;
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading;
+using UnityEngine.Networking;
+
+namespace YooAsset
+{
+	/// <summary>
+	/// 自定义下载器的请求委托
+	/// </summary>
+	public delegate UnityWebRequest DownloadRequestDelegate(string url);
+
+	/// <summary>
+	/// 1. 保证每一时刻资源文件只存在一个下载器
+	/// 2. 保证下载器下载完成后立刻验证并缓存
+	/// 3. 保证资源文件不会被重复下载
+	/// </summary>
+	internal static class DownloadSystem
+	{
+		private static readonly Dictionary<string, DownloaderBase> _downloaderDic = new Dictionary<string, DownloaderBase>();
+		private static readonly List<string> _removeList = new List<string>(100);
+
+		/// <summary>
+		/// 自定义下载器的请求委托
+		/// </summary>
+		public static DownloadRequestDelegate RequestDelegate = null;
+
+		/// <summary>
+		/// 自定义的证书认证实例
+		/// </summary>
+		public static CertificateHandler CertificateHandlerInstance = null;
+
+		/// <summary>
+		/// 网络重定向次数
+		/// </summary>
+		public static int RedirectLimit { set; get; } = -1;
+
+		/// <summary>
+		/// 启用断点续传功能文件的最小字节数
+		/// </summary>
+		public static int BreakpointResumeFileSize { set; get; } = int.MaxValue;
+
+		/// <summary>
+		/// 下载失败后清理文件的HTTP错误码
+		/// </summary>
+		public static List<long> ClearFileResponseCodes { set; get; }
+
+
+		/// <summary>
+		/// 初始化下载器
+		/// </summary>
+		public static void Initialize()
+		{
+		}
+
+		/// <summary>
+		/// 更新下载器
+		/// </summary>
+		public static void Update()
+		{
+			// 更新下载器
+			_removeList.Clear();
+			foreach (var valuePair in _downloaderDic)
+			{
+				var downloader = valuePair.Value;
+				downloader.Update();
+				if (downloader.IsDone())
+					_removeList.Add(valuePair.Key);
+			}
+
+			// 移除下载器
+			foreach (var key in _removeList)
+			{
+				_downloaderDic.Remove(key);
+			}
+		}
+
+		/// <summary>
+		/// 销毁所有下载器
+		/// </summary>
+		public static void DestroyAll()
+		{
+			foreach (var valuePair in _downloaderDic)
+			{
+				var downloader = valuePair.Value;
+				downloader.Abort();
+			}
+			_downloaderDic.Clear();
+			_removeList.Clear();
+
+			RequestDelegate = null;
+			CertificateHandlerInstance = null;
+			BreakpointResumeFileSize = int.MaxValue;
+			ClearFileResponseCodes = null;
+		}
+
+
+		/// <summary>
+		/// 创建下载器
+		/// 注意：只有第一次请求的参数才有效
+		/// </summary>
+		public static DownloaderBase CreateDownload(BundleInfo bundleInfo, int failedTryAgain, int timeout = 60)
+		{
+			// 查询存在的下载器
+			if (_downloaderDic.TryGetValue(bundleInfo.Bundle.CachedDataFilePath, out var downloader))
+				return downloader;
+
+			// 如果资源已经缓存
+			if (CacheSystem.IsCached(bundleInfo.Bundle.PackageName, bundleInfo.Bundle.CacheGUID))
+			{
+				var completedDownloader = new CompletedDownloader(bundleInfo);
+				return completedDownloader;
+			}
+
+			// 创建新的下载器	
+			YooLogger.Log($"Beginning to download bundle : {bundleInfo.Bundle.BundleName} URL : {bundleInfo.RemoteMainURL}");
+#if UNITY_WEBGL
+			if (bundleInfo.Bundle.IsRawFile)
+			{
+				FileUtility.CreateFileDirectory(bundleInfo.Bundle.CachedDataFilePath);
+				DownloaderBase newDownloader = new FileGeneralDownloader(bundleInfo, failedTryAgain, timeout);
+				_downloaderDic.Add(bundleInfo.Bundle.CachedDataFilePath, newDownloader);
+				return newDownloader;
+			}
+			else
+			{
+				WebDownloader newDownloader = new WebDownloader(bundleInfo, failedTryAgain, timeout);
+				_downloaderDic.Add(bundleInfo.Bundle.CachedDataFilePath, newDownloader);
+				return newDownloader;
+			}
+#else
+			FileUtility.CreateFileDirectory(bundleInfo.Bundle.CachedDataFilePath);
+			bool resumeDownload = bundleInfo.Bundle.FileSize >= BreakpointResumeFileSize;
+			DownloaderBase newDownloader;
+			if (resumeDownload)
+				newDownloader = new FileResumeDownloader(bundleInfo, failedTryAgain, timeout);
+			else
+				newDownloader = new FileGeneralDownloader(bundleInfo, failedTryAgain, timeout);
+			_downloaderDic.Add(bundleInfo.Bundle.CachedDataFilePath, newDownloader);
+			return newDownloader;
+#endif
+		}
+
+		/// <summary>
+		/// 创建一个新的网络请求
+		/// </summary>
+		public static UnityWebRequest NewRequest(string requestURL)
+		{
+			UnityWebRequest webRequest;
+			if (RequestDelegate != null)
+				webRequest = RequestDelegate.Invoke(requestURL);
+			else
+				webRequest = new UnityWebRequest(requestURL, UnityWebRequest.kHttpVerbGET);
+
+			SetUnityWebRequestParam(webRequest);
+			return webRequest;
+		}
+
+		/// <summary>
+		/// 设置网络请求的自定义参数
+		/// </summary>
+		private static void SetUnityWebRequestParam(UnityWebRequest webRequest)
+		{
+			if (RedirectLimit >= 0)
+				webRequest.redirectLimit = RedirectLimit;
+
+			if (CertificateHandlerInstance != null)
+			{
+				webRequest.certificateHandler = CertificateHandlerInstance;
+				webRequest.disposeCertificateHandlerOnDispose = false;
+			}
+		}
+
+		/// <summary>
+		/// 获取下载器的总数
+		/// </summary>
+		public static int GetDownloaderTotalCount()
+		{
+			return _downloaderDic.Count;
+		}
+	}
+}