protected override async Task <IQueueEntry <T> > DequeueImplAsync(CancellationToken linkedCancellationToken)
{
_logger.Trace("Queue {type} dequeuing item...", _options.Name);
_logger.Trace("Queue count: {0}", _queue.Count);
while (_queue.Count == 0 && !linkedCancellationToken.IsCancellationRequested)
{
_logger.Trace("Waiting to dequeue item...");
var sw = Stopwatch.StartNew();
try {
await _autoResetEvent.WaitAsync(GetDequeueCanncellationToken(linkedCancellationToken)).AnyContext();
} catch (OperationCanceledException) { }
sw.Stop();
_logger.Trace("Waited for dequeue: {0}", sw.Elapsed.ToString());
}
if (_queue.Count == 0)
{
return(null);
}
_logger.Trace("Dequeue: Attempt");
if (!_queue.TryDequeue(out QueueEntry <T> info) || info == null)
{
return(null);
}
info.Attempts++;
info.DequeuedTimeUtc = SystemClock.UtcNow;
if (!_dequeued.TryAdd(info.Id, info))
{
throw new Exception("Unable to add item to the dequeued list.");
}
Interlocked.Increment(ref _dequeuedCount);
_logger.Trace("Dequeue: Got Item");
var entry = new QueueEntry <T>(info.Id, info.Value.DeepClone(), this, info.EnqueuedTimeUtc, info.Attempts);
await entry.RenewLockAsync();
await OnDequeuedAsync(entry).AnyContext();
ScheduleNextMaintenance(SystemClock.UtcNow.Add(_options.WorkItemTimeout));
return(entry);
}
protected override async Task <IQueueEntry <T> > DequeueImplAsync(CancellationToken linkedCancellationToken)
{
bool isTraceLogLevelEnabled = _logger.IsEnabled(LogLevel.Trace);
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Queue {Name} dequeuing item... Queue count: {Count}", _options.Name, _queue.Count);
}
while (_queue.Count == 0 && !linkedCancellationToken.IsCancellationRequested)
{
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Waiting to dequeue item...");
}
var sw = Stopwatch.StartNew();
try {
using (var timeoutCancellationTokenSource = new CancellationTokenSource(10000))
using (var dequeueCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(linkedCancellationToken, timeoutCancellationTokenSource.Token)) {
await _autoResetEvent.WaitAsync(dequeueCancellationTokenSource.Token).AnyContext();
}
} catch (OperationCanceledException) { }
sw.Stop();
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Waited for dequeue: {Elapsed:g}", sw.Elapsed);
}
}
if (_queue.Count == 0)
{
return(null);
}
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Dequeue: Attempt");
}
if (!_queue.TryDequeue(out var info) || info == null)
{
return(null);
}
info.Attempts++;
info.DequeuedTimeUtc = SystemClock.UtcNow;
if (!_dequeued.TryAdd(info.Id, info))
{
throw new Exception("Unable to add item to the dequeued list.");
}
Interlocked.Increment(ref _dequeuedCount);
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Dequeue: Got Item");
}
var entry = new QueueEntry <T>(info.Id, info.Value.DeepClone(), this, info.EnqueuedTimeUtc, info.Attempts);
await entry.RenewLockAsync();
await OnDequeuedAsync(entry).AnyContext();
ScheduleNextMaintenance(SystemClock.UtcNow.Add(_options.WorkItemTimeout));
return(entry);
}
