108 lines
2.8 KiB
C#
108 lines
2.8 KiB
C#
using System;
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using System.IO;
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using System.Collections;
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using System.Collections.Generic;
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namespace YooAsset
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{
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/// <summary>
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/// 1. 保证每一时刻资源文件只存在一个下载器
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/// 2. 保证下载器下载完成后立刻验证并缓存
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/// 3. 保证资源文件不会被重复下载
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/// </summary>
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internal static class DownloadSystem
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{
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private static readonly Dictionary<string, DownloaderBase> _downloaderDic = new Dictionary<string, DownloaderBase>();
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private static readonly List<string> _removeList = new List<string>(100);
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private static int _breakpointResumeFileSize = int.MaxValue;
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/// <summary>
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/// 初始化
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/// </summary>
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public static void Initialize(int breakpointResumeFileSize)
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{
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_breakpointResumeFileSize = breakpointResumeFileSize;
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}
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/// <summary>
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/// 更新所有下载器
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/// </summary>
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public static void Update()
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{
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// 更新下载器
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_removeList.Clear();
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foreach (var valuePair in _downloaderDic)
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{
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var downloader = valuePair.Value;
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downloader.Update();
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if (downloader.IsDone())
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_removeList.Add(valuePair.Key);
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}
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// 移除下载器
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foreach (var key in _removeList)
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{
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_downloaderDic.Remove(key);
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}
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}
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/// <summary>
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/// 销毁所有下载器
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/// </summary>
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public static void DestroyAll()
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{
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foreach (var valuePair in _downloaderDic)
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{
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var downloader = valuePair.Value;
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downloader.Abort();
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}
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_downloaderDic.Clear();
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_removeList.Clear();
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_breakpointResumeFileSize = int.MaxValue;
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}
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/// <summary>
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/// 开始下载资源文件
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/// 注意：只有第一次请求的参数才是有效的
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/// </summary>
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public static DownloaderBase BeginDownload(BundleInfo bundleInfo, int failedTryAgain, int timeout = 60)
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{
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// 查询存在的下载器
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if (_downloaderDic.TryGetValue(bundleInfo.FileHash, out var downloader))
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{
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return downloader;
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}
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// 如果资源已经缓存
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if (CacheSystem.ContainsVerifyFile(bundleInfo.FileHash))
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{
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var tempDownloader = new TempDownloader(bundleInfo);
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return tempDownloader;
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}
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// 创建新的下载器
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{
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YooLogger.Log($"Beginning to download file : {bundleInfo.FileName} URL : {bundleInfo.RemoteMainURL}");
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FileUtility.CreateFileDirectory(bundleInfo.GetCacheLoadPath());
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DownloaderBase newDownloader;
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if (bundleInfo.FileSize >= _breakpointResumeFileSize)
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newDownloader = new HttpDownloader(bundleInfo);
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else
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newDownloader = new FileDownloader(bundleInfo);
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newDownloader.SendRequest(failedTryAgain, timeout);
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_downloaderDic.Add(bundleInfo.FileHash, newDownloader);
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return newDownloader;
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}
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}
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/// <summary>
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/// 获取下载器的总数
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/// </summary>
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public static int GetDownloaderTotalCount()
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{
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return _downloaderDic.Count;
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}
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}
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} |