public Task StopAsync(QueueStopReason reason = null)
{
stopReason = reason = reason ?? defaultStopReason;
stopped = new TaskCompletionSource <object>();
Dispatch(_ =>
{
foreach (var queue in queues.Where(x => reason.IsCancellable(this, x.Type)))
{
queue.Cancel();
}
});
return(stopped.Task);
}
private void Process()
{
// Each iteration here we'll call a round
while (true)
{
// Process any requests that have come in that want to perform blocking work on the processor thread.
ProcessDispatches();
var wasItemDequeued = false;
foreach (var queue in queues)
{
if (queue.IsAvailable && (!queue.cancellationToken.IsCancellationRequested || stopReason.IsCancellable(this, queue.Type)))
{
var queueItem = queue.Dequeue();
wasItemDequeued = true;
queue.Activate(queueItem);
Task.Run(() => queueItem.Execute().ContinueWith(_ => Dispatch(processor => queue.Deactivate(queueItem))));
}
else
{
queue.MarkWaiting();
}
}
if (!wasItemDequeued && !dispatches.Any())
{
if (stopReason != null)
{
break;
}
if (queues.All(x => x.IsIdle))
{
Log("All queues idle, triggering idle task");
idled.SetResult(null);
idled = new TaskCompletionSource <object>();
}
// Wait for either a new item to be enqueued (waiter) or for the cancellation token to be triggered
Log("Round finished, waiting");
waiting.SetResult(null);
waiting = new TaskCompletionSource <object>();
waiter.WaitOne();
}
}
Debug.Assert(stopped != null);
stopReason = null;
stopped.SetResult(null);
}