protected override void BeginRequest(RetryQueueRequest request)
{
//Adding an intentional delay here to work around a known timing issue
//with the SSME. If this is called too soon after initialization the
//request will be aborted with no indication raised from the SSME.
//TODO: Remove this workaround once the SSME has been fixed.
DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(250);
EventHandler tickHandler = null;
tickHandler = (s, e) =>
{
Segment segment = null;
List<StreamInfo> streams = null;
var streamSelectionRequest = request as StreamSelectionRequest;
if (streamSelectionRequest != null)
{
streams = streamSelectionRequest.Streams.Select(i => i.StreamInfo).ToList();
segment = streamSelectionRequest.Segment;
}
else
{
var streamModifyRequest = request as StreamModifyRequest;
if (streamModifyRequest != null)
{
streams = streamModifyRequest.Streams.Select(i => i.StreamInfo).ToList();
segment = streamModifyRequest.Segment;
}
}
segment.SegmentInfo.SelectStreamsAsync(streams, request);
timer.Tick -= tickHandler;
timer.Stop();
};
timer.Tick += tickHandler;
timer.Start();
}
private void AttemptToStartRequests()
{
lock (_threadSync)
{
while (HasPendingRequests && _activeRequests.Count < MaximumConcurrentRequests)
{
RetryQueueRequest nextItem = NextRequest();
if (nextItem != null)
{
nextItem.LastAttemptStarted = DateTime.Now;
_activeRequests.Add(nextItem);
BeginRequest(nextItem);
if (!_timeoutMonitor.IsEnabled)
{
_timeoutMonitor.Start();
}
}
else
{
if (!_timeoutMonitor.IsEnabled)
{
_timeoutMonitor.Start();
}
break;
}
}
}
}
protected void NotifyRequestSuccessful(RetryQueueRequest request)
{
lock (_threadSync)
{
if (_activeRequests.Contains(request))
{
_activeRequests.Remove(request);
}
}
OnRequestCompleted(request);
AttemptToStartRequests();
}
protected void NotifyRequestSuccessful(RetryQueueRequest request)
{
lock (_threadSync)
{
if (_activeRequests.Contains(request))
{
_activeRequests.Remove(request);
}
}
OnRequestCompleted(request);
AttemptToStartRequests();
}
protected virtual void CancelRequest(RetryQueueRequest request) { }
protected virtual void OnRequestCompleted(RetryQueueRequest request) { }
protected virtual void OnRequestExceededMaximumRetryAttempts(RetryQueueRequest request) { }
protected virtual void OnRetryingRequest(RetryQueueRequest request) { }
protected abstract void BeginRequest(RetryQueueRequest request);
protected override void CancelRequest(RetryQueueRequest request)
{
base.CancelRequest(request);
var offlineTask = request as OfflineTask;
if (offlineTask != null && offlineTask.DownloadWebClient != null)
{
offlineTask.DownloadWebClient.CancelAsync();
}
}
protected override void OnRequestExceededMaximumRetryAttempts(RetryQueueRequest request)
{
base.OnRequestExceededMaximumRetryAttempts(request);
var downloadRequest = request as DownloadRequest;
if (DownloadExceededMaximumRetries != null && downloadRequest != null)
{
DownloadExceededMaximumRetries(this, downloadRequest.MediaTrack, downloadRequest.ChunkTimestamp);
}
}
protected void AddRequest(RetryQueueRequest request)
{
_requestQueue.Enqueue(request);
NotifyRequestAdded();
}
protected override void OnRetryingRequest(RetryQueueRequest request)
{
base.OnRetryingRequest(request);
var streamSelectionRequest = request as IStreamSelectionRequest;
if (RetryingStreamSelection != null && streamSelectionRequest != null)
{
RetryingStreamSelection(this, streamSelectionRequest.Segment, streamSelectionRequest.Streams);
}
}
protected virtual void CancelRequest(RetryQueueRequest request)
{
}
protected virtual void OnRequestCompleted(RetryQueueRequest request)
{
}
protected virtual void OnRequestExceededMaximumRetryAttempts(RetryQueueRequest request)
{
}
protected virtual void OnRetryingRequest(RetryQueueRequest request)
{
}
protected override void BeginRequest(RetryQueueRequest request)
{
var downloadRequest = request as DownloadRequest;
if (downloadRequest != null)
{
_rateMonitor.UpdateRate();
if (_rateMonitor.CurrentRate > _maximumRequestRate)
{
var delay = _rateMonitor.RecommendDelay(_maximumRequestRate);
var timer = new DispatcherTimer
{
Interval = delay
};
EventHandler tickHandler = null;
tickHandler = (s, e) =>
{
timer.Tick -= tickHandler;
timer.Stop();
downloadRequest.MediaTrack.TrackInfo.BeginGetChunk(
downloadRequest.ChunkTimestamp, BeginGetChunk_Completed,
downloadRequest);
};
timer.Tick += tickHandler;
timer.Start();
}
else
{
downloadRequest.MediaTrack.TrackInfo.BeginGetChunk(downloadRequest.ChunkTimestamp, BeginGetChunk_Completed, downloadRequest);
}
}
}
protected override void OnRequestExceededMaximumRetryAttempts(RetryQueueRequest request)
{
base.OnRequestExceededMaximumRetryAttempts(request);
var streamSelectionRequest = request as IStreamSelectionRequest;
if (StreamSelectionExceededMaximumRetries != null && streamSelectionRequest != null)
{
StreamSelectionExceededMaximumRetries(this, streamSelectionRequest.Segment, streamSelectionRequest.Streams);
}
}
protected override void OnRetryingRequest(RetryQueueRequest request)
{
base.OnRetryingRequest(request);
var downloadRequest = request as DownloadRequest;
if (RetryingDownload != null && downloadRequest != null)
{
RetryingDownload(this, downloadRequest.MediaTrack, downloadRequest.ChunkTimestamp);
}
}
protected void AddRequest(RetryQueueRequest request)
{
_requestQueue.Enqueue(request);
NotifyRequestAdded();
}
protected override void BeginRequest(RetryQueueRequest request)
{
var offlineTask = request as OfflineTask;
if (offlineTask != null)
{
switch (offlineTask.Type)
{
case OfflineTaskType.DownloadFile:
BeginDownloadFile(offlineTask);
break;
case OfflineTaskType.ProcessManifest:
break;
case OfflineTaskType.QueueChunkList:
break;
default:
break;
}
}
}
protected abstract void BeginRequest(RetryQueueRequest request);
