/// <summary>
/// 获取下载完成的文件长度
/// </summary>
/// <returns></returns>
public long GetDownloadedLength()
{
lock (_locker)
{
return(DownloadSegmentList.Sum(downloadSegment => downloadSegment.DownloadedLength));
}
}
/// <summary>
/// 是否下载完成
/// </summary>
/// <returns></returns>
public bool IsFinished()
{
lock (_locker)
{
return(DownloadSegmentList.TrueForAll(segment => segment.Finished));
}
}
/// <summary>
/// 获取当前所有下载段
/// </summary>
/// <returns></returns>
public IReadOnlyList <DownloadSegment> GetCurrentDownloadSegmentList()
{
lock (_locker)
{
return(DownloadSegmentList.ToList());
}
}
/// <summary>
/// 注册下载段
/// </summary>
/// <param name="downloadSegment"></param>
public void RegisterDownloadSegment(DownloadSegment downloadSegment)
{
downloadSegment.Message = "Start RegisterDownloadSegment";
lock (_locker)
{
// 找到顺序
var n = DownloadSegmentList.FindIndex(temp => temp.StartPoint > downloadSegment.StartPoint);
if (n < 0)
{
// 找不到一个比他大的，放在最后面
DownloadSegmentList.Add(downloadSegment);
}
else
{
// 原本是按照顺序的，找到第一个比他大的，放在前面
DownloadSegmentList.Insert(n, downloadSegment);
}
downloadSegment.Number = DownloadSegmentList.Count;
downloadSegment.SegmentManager = this;
}
downloadSegment.Message = "Finish RegisterDownloadSegment";
}
/// <summary>
/// 写入文件，可不等待
/// </summary>
/// <param name="fileStartPoint">从文件的哪里开始写</param>
/// <param name="data">写入的数据</param>
/// <param name="dataOffset"></param>
/// <param name="dataLength"></param>
public async Task WriteAsync(long fileStartPoint, byte[] data, int dataOffset, int dataLength)
{
var task = new TaskCompletionSource <bool>();
var fileSegment = new FileSegment(fileStartPoint, data, dataOffset, dataLength, task);
DownloadSegmentList.Enqueue(fileSegment);
await task.Task;
}
public void RegisterDownloadSegment(DownloadSegment downloadSegment)
{
lock (_locker)
{
// 找到顺序
var n = DownloadSegmentList.FindIndex(temp => temp.StartPoint > downloadSegment.StartPoint);
if (n < 0)
{
DownloadSegmentList.Add(downloadSegment);
}
else
{
DownloadSegmentList.Insert(n, downloadSegment);
}
downloadSegment.Number = DownloadSegmentList.Count;
downloadSegment.SegmentManager = this;
}
}
private async Task WriteToFile()
{
while (true)
{
var fileSegment = await DownloadSegmentList.DequeueAsync();
try
{
Stream.Seek(fileSegment.FileStartPoint, SeekOrigin.Begin);
await Stream.WriteAsync(fileSegment.Data, fileSegment.DataOffset, fileSegment.DataLength);
}
catch (Exception e)
{
Exception = e;
WriteFinished?.Invoke(this, EventArgs.Empty);
return;
}
try
{
fileSegment.TaskCompletionSource?.SetResult(true);
}
catch (Exception)
{
// 执行业务代码
}
var isEmpty = DownloadSegmentList.Count == 0;
if (isEmpty)
{
WriteFinished?.Invoke(this, EventArgs.Empty);
if (_isDispose)
{
return;
}
}
}
}