/// <summary>
/// Starts the download task.
/// </summary>
public void StartDownload()
{
RemoteFileInfo remoteFileInfo = null;
try
{
ChangeState(DownloadTaskState.Preparing);
m_StartDate = DateTime.Now;
INetworkProtocolProvider networkProtocolProvider = m_NetworkProtocolProviderFactory.CreateProvider(m_File.Uri);
remoteFileInfo = networkProtocolProvider.GetRemoteFileInfo(m_File);
remoteFileInfo.FileName = m_File.FileName;
m_FileSize = remoteFileInfo.FileSize;
m_IsResumable = remoteFileInfo.AcceptRanges;
DownloadSegmentPositions[] segmentPositionInfos;
if (remoteFileInfo.AcceptRanges)
{
segmentPositionInfos = m_DownloadSegmentCalculator.Calculate(m_Settings.MinimumSegmentSize, m_Settings.MaximumSegmentCount, m_File.SegmentCount, remoteFileInfo.FileSize);
}
else
{
segmentPositionInfos = new[] { new DownloadSegmentPositions(0, remoteFileInfo.FileSize - 1) };
}
using (Stream stream = m_DownloadStreamManager.CreateStream(remoteFileInfo))
{
SegmentWriter segmentWriter = new SegmentWriter(stream);
SegmentDownloadTasks = new SegmentDownloadTaskCollection(segmentPositionInfos.Length);
for (int i = 0; i < segmentPositionInfos.Length; i++)
{
DownloadSegmentPositions segmentPosition = segmentPositionInfos[i];
SegmentDownloadTasks.Add(new DoubleBufferSegmentDownloadTask(m_Settings.DownloadBufferSize, new SegmentDownloader(m_File, networkProtocolProvider, segmentPosition, new SegmentDownloadRateCalculator(segmentPosition.StartPosition)), segmentWriter));
}
SegmentDownloadManager segmentDownloadManager = new SegmentDownloadManager(SegmentDownloadTasks);
segmentDownloadManager.Start();
ChangeState(DownloadTaskState.Working);
segmentDownloadManager.Finish(true);
ChangeState(DownloadTaskState.Ended);
m_EventManager.EventPublisher.Publish(new DownloadTaskFinishedEventMessage(this, stream, remoteFileInfo));
}
}
catch (Exception ex)
{
if (m_RetryCount < m_Settings.MaximumRetries)
{
m_RetryCount++;
StartDownload();
}
else
{
m_LastException = ex;
ChangeState(DownloadTaskState.EndedWithError);
m_EventManager.EventPublisher.Publish(new DownloadTaskFinishedEventMessage(this, null, remoteFileInfo));
}
}
}
