public override void Dispose()
{
if (FileSegmentsManager != null)
{
FileSegmentsManager.RemoveFile(FileName);
}
base.Dispose();
}
/// <summary>
/// 通过指定的单位块大小实例化片断管理对象(单位kb)
/// </summary>
/// <param name="segmentUnit"></param>
/// <returns></returns>
public static FileSegmentsManager Create(int segmentUnit)
{
if (_segmentManagerInstance != null)
{
return(_segmentManagerInstance);
}
lock (AsyncRoot)
{
if (_segmentManagerInstance == null)
{
if (segmentUnit > 100)
{
_segmentUnit = segmentUnit * 1024;
}
return(_segmentManagerInstance = new FtpFileSegmentsManager());
}
return(_segmentManagerInstance);
}
}
public override void DownLoadFileAsync(object userState = null)
{
UserState = userState;
var action = new Action(() =>
{
//获取拆分的下载片断
FileSegmentsManager = FtpFileSegmentsManager.Create();
FileSegmentsManager.AddFile(TempDir, FileName, FileLength, LastModified);
Segments.Value.AddRange(FileSegmentsManager.GetSegmentsByFileName(FileName));
var sgmtGroupList = Segments.Value.Take(MaxThreadCount);
int skipCount = 0;
while (sgmtGroupList.Any())
{
foreach (var segment in sgmtGroupList)
{
var cts = new CancellationTokenSource();
var task = Task.Factory.StartNew(FillSenmentData, segment, cts.Token);
SegmentRunningTasks.Value.Add(task);
//task.Wait(); //方便调试
}
;
try
{
Task.WaitAll(SegmentRunningTasks.Value.ToArray());
}
catch (AggregateException ae)
{
OnFileDownloadCompletedEventHandler(new FileDownLoadCompletedEventArgs(TransferState.Error, ae.GetErrorString(), UserState));
break;
}
catch (Exception e)
{
OnFileDownloadCompletedEventHandler(new FileDownLoadCompletedEventArgs(TransferState.Error, e.GetErrorString(), UserState));
break;
}
skipCount += MaxThreadCount;
sgmtGroupList = Segments.Value.Skip(skipCount).Take(MaxThreadCount);
}
});
action.BeginInvoke(null, null);
}
public override void DownLoadFileAsync(object userState = null)
{
UserState = userState;
var action = new Action(() =>
{
/*
* 如支持断点续传且文件大小>=10MB
* 则获取拆分的下载片断
*/
if (!BreakpointResumeDisabled && FileLength >= 10 * 1024 * 1024)
{
FileSegmentsManager = HttpFileSegmentsManager.Create();
FileSegmentsManager.AddFile(TempDir, FileName, FileLength, LastModified);
Segments.Value.AddRange(FileSegmentsManager.GetSegmentsByFileName(FileName));
var sgmtGroupList = Segments.Value.Take(MaxThreadCount);
int skipCount = 0;
while (sgmtGroupList.Any())
{
foreach (var segment in sgmtGroupList)
{
var cts = new System.Threading.CancellationTokenSource();
var task = Task.Factory.StartNew(FillSenmentData, segment, cts.Token);
SegmentRunningTasks.Value.Add(task);
//task.Wait(); //方便调试
}
;
try
{
Task.WaitAll(SegmentRunningTasks.Value.ToArray());
}
catch (AggregateException ae)
{
OnFileDownloadCompletedEventHandler(new FileDownLoadCompletedEventArgs(TransferState.Error, ae.GetErrorString(), this.UserState));
break;
}
catch (Exception e)
{
OnFileDownloadCompletedEventHandler(new FileDownLoadCompletedEventArgs(TransferState.Error, e.GetErrorString(), this.UserState));
break;
}
skipCount += MaxThreadCount;
sgmtGroupList = Segments.Value.Skip(skipCount).Take(MaxThreadCount);
}
}
else
{
if (wc == null)
{
wc = new MyWebClient();
}
var tempDir = Path.Combine(TempDir, FileName, DateTime.Now.ToFileTimeUtc().ToString());
if (!Directory.Exists(tempDir))
{
Directory.CreateDirectory(tempDir);
}
var targetFileName = string.IsNullOrEmpty(ExtensionName) ? Path.Combine(tempDir, FileName) : Path.Combine(tempDir, FileName) + "." + ExtensionName;
wc.DownloadProgressChanged += (s, e) =>
{
lock (this.wc)
{
OnProgressChanged(new ProgressChangedEventArgs(e.ProgressPercentage, this.UserState));
}
};
wc.DownloadFileCompleted += (s, e) =>
{
if (e.Error == null && !e.Cancelled)
{
OnFileDownloadCompletedEventHandler(new FileDownLoadCompletedEventArgs(TransferState.Completed, e.UserState.ToString(), UserState));
}
else
{
OnFileDownloadCompletedEventHandler(new FileDownLoadCompletedEventArgs(TransferState.Error, e.Error?.GetErrorString(), this.UserState));
}
};
wc.DownloadFileAsync(new Uri(DownloadFileUrl), targetFileName, targetFileName);
}
});
action.BeginInvoke(null, null);
}