public bool EndDequeue(IAsyncResult result, out T value)
{
var typedResult = result as TypedCompletedAsyncResult <T>;
if (typedResult != null)
{
value = TypedCompletedAsyncResult <T> .End(result);
return(true);
}
return(AsyncQueueReader <T> .End(result, out value));
}
public IAsyncResult BeginDequeue(TimeSpan timeout, AsyncCallback callback, object state)
{
var item = default(Item <T>);
lock (ThisLock)
{
if (_queueState == QueueState.Open)
{
if (_itemQueue.HasAvailableItem)
{
item = _itemQueue.DequeueAvailableItem();
}
else
{
var reader = new AsyncQueueReader <T>(this, timeout, callback, state);
_readerQueue.Enqueue(reader);
return(reader);
}
}
else if (_queueState == QueueState.Shutdown)
{
if (_itemQueue.HasAvailableItem)
{
item = _itemQueue.DequeueAvailableItem();
}
else if (_itemQueue.HasAnyItem)
{
var reader = new AsyncQueueReader <T>(this, timeout, callback, state);
_readerQueue.Enqueue(reader);
return(reader);
}
}
}
InvokeDequeuedCallback(item.DequeuedCallback);
return(new TypedCompletedAsyncResult <T>(item.GetValue(), callback, state));
}