/// <summary>
/// 添加指定的下载器进行下载,并且缓存没过期就返回缓存
/// </summary>
/// <param name="priority">优先级,越大优先级越高</param>
/// <param name="url">下载地址</param>
/// <param name="savePath">文件保存路径</param>
/// <param name="fileName">文件名.默认为下载的文件名</param>
/// <param name="timeOut">毫秒,默认为统一超时时间</param>
/// <param name="cacheExpiredDay">过期天数</param>
/// <param name="retryCount">重试次数</param>
/// <param name="downloadProgressHandle">下载中</param>
/// <param name="completeHandle">下载完成</param>
/// <param name="errorHandle">下载失败</param>
/// <param name="isFindCacheLibrary">是否查找缓存库,默认查找</param>
public IDownload AddDownload <T>(int priority, string url, string savePath, string fileName = "", int timeOut = -1,
int cacheExpiredDay = -1,
int retryCount = -1, Action <DownloadInfo> downloadStartHandle = null, Action <DownloadProgressInfo, string> downloadProgressHandle = null,
Action <string> completeHandle = null,
Action <String> errorHandle = null, bool isFindCacheLibrary = true) where T : IDownload, new()
{
Init();
_error = false;
IDownload download = new T();
DownloadUnitInfo info = new DownloadUnitInfo()
{
DownloadUtil = download,
Priority = priority,
Url = url,
SavePath = savePath,
FileName = fileName,
TimeOut = timeOut,
RetryCount = retryCount,
CacheExpiredDay = cacheExpiredDay,
DownloadStartHandle = downloadStartHandle,
DownloadProgressHandle = downloadProgressHandle,
CompleteHandle = completeHandle,
ErrorHandle = errorHandle,
IsFindCacheLibrary = isFindCacheLibrary
};
_downloadQueue.Add(info);
++WaitDownloadCount;
Update();
return(download);
}
private FileCacheEntity _getCache(DownloadUnitInfo info)
{
if (_hasCache(info))
{
return(_cacheFileLibraryContent[_getKey(info)]);
}
return(null);
}
private void _complete(DownloadUnitInfo download)
{
--CurrentDownloadCount;
_addOrUpdateCache(download);
download.CompleteHandle?.Invoke(_getCache(download).FilePath);
download.DownloadUtil.Dispose();
Update();
}
private void _startdownload(DownloadUnitInfo download)
{
//如果没有指定文件名就将文件名设置为远程文件名
if (string.IsNullOrEmpty(download.FileName))
{
var p = download.Url.Split('/', '\\');
download.FileName = p.Last();
}
//todo 查找缓存
if (download.IsFindCacheLibrary)
{
//命中
if (_hasCache(download))
{
//文件存在就返回
if (Utility.FileUtil.IsFileExists(Path.Combine(download.SavePath, download.FileName)))
{
_complete(download);
return;
}
}
}
download.TimeOut = download.TimeOut < 0 ? TimeOut : download.TimeOut;
download.RetryCount = download.RetryCount < 0 ? RetryCount : download.RetryCount;
download.CacheExpiredDay = download.CacheExpiredDay < 0
? CacheExpiredDay
: download.CacheExpiredDay;
download.DownloadUtil.Download(
download.Url, download.Headers, download.SavePath, download.FileName, download.DownloadStartHandle, download.DownloadProgressHandle,
x =>
{
_complete(download);
}, ex =>
{
_error = true;
if (download.CurrentRetryCount < download.RetryCount)
{
++download.CurrentRetryCount;
UnityEngine.Debug.Log($"失败重来,当前重试次数:{download.CurrentRetryCount},失败信息：\n{ex}");
_startdownload(download);
return;
}
--CurrentDownloadCount;
download.ErrorHandle?.Invoke(ex);
download.DownloadUtil.Dispose();
Update();
});
}
private void _addOrUpdateCache(DownloadUnitInfo info)
{
_sb.Clear();
var cacheTime = (ulong)DateTime.Now.Ticks;
ulong cacheExpiredTime = 0;
if (info.CacheExpiredDay > 0)
{
DateTime centuryBegin = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day + CacheExpiredDay);
cacheExpiredTime = (ulong)centuryBegin.Ticks;
}
var expiredTime = cacheExpiredTime;
if (!_hasCache(info))
{
_cacheFileLibraryContent.Add(_getKey(info), new FileCacheEntity()
{
Url = info.Url,
FilePath = Utility.FileUtil.UpdatePathDirectorySeparator(Path.Combine(info.SavePath, info.FileName)),
CacheTime = cacheTime,
ExpiredTime = expiredTime
});
}
else
{
//更新缓存的缓存时间和过期时间
_cacheFileLibraryContent[_getKey(info)].CacheTime = cacheTime;
_cacheFileLibraryContent[_getKey(info)].ExpiredTime = expiredTime;
}
foreach (var cacheEntity in _cacheFileLibraryContent)
{
_sb.AppendLine(FileCacheEntity.Serialization(cacheEntity.Value));
}
File.WriteAllText(GetCacheLibraryFilePath(), _sb.ToString());
}
private bool _hasCache(DownloadUnitInfo info)
{
return(_cacheFileLibraryContent.ContainsKey(_getKey(info)));
}
private string _getKey(DownloadUnitInfo info)
{
return(_getKey(info.Url, info.SavePath, info.FileName));
}
