internal async Task <HorseQueue> CreateQueue(string queueName,
QueueOptions options,
HorseMessage requestMessage,
Func <DeliveryHandlerBuilder, Task <IMessageDeliveryHandler> > asyncHandler,
bool hideException,
bool returnIfExists)
{
await _createQueueLocker.WaitAsync();
try
{
if (!Filter.CheckNameEligibility(queueName))
{
throw new InvalidOperationException("Invalid queue name");
}
if (Options.QueueLimit > 0 && Options.QueueLimit >= _queues.Count)
{
throw new OperationCanceledException("Queue limit is exceeded for the server");
}
HorseQueue queue = _queues.Find(x => x.Name == queueName);
if (queue != null)
{
if (returnIfExists)
{
return(queue);
}
throw new DuplicateNameException($"The server has already a queue with same name: {queueName}");
}
string topic = null;
bool statusSpecified = false; //when queue is created by subscriber, it will be initialized if status is specified
if (requestMessage != null)
{
string waitForAck = requestMessage.FindHeader(HorseHeaders.ACKNOWLEDGE);
if (!string.IsNullOrEmpty(waitForAck))
{
switch (waitForAck.Trim().ToLower())
{
case "none":
options.Acknowledge = QueueAckDecision.None;
break;
case "request":
options.Acknowledge = QueueAckDecision.JustRequest;
break;
case "wait":
options.Acknowledge = QueueAckDecision.WaitForAcknowledge;
break;
}
}
string queueStatus = requestMessage.FindHeader(HorseHeaders.QUEUE_STATUS);
if (queueStatus != null)
{
statusSpecified = true;
options.Status = QueueStatusHelper.FindStatus(queueStatus);
}
topic = requestMessage.FindHeader(HorseHeaders.QUEUE_TOPIC);
string delay = requestMessage.FindHeader(HorseHeaders.DELAY_BETWEEN_MESSAGES);
if (!string.IsNullOrEmpty(delay))
{
options.DelayBetweenMessages = Convert.ToInt32(delay);
}
}
queue = new HorseQueue(this, queueName, options);
if (!string.IsNullOrEmpty(topic))
{
queue.Topic = topic;
}
DeliveryHandlerBuilder handlerBuilder = new DeliveryHandlerBuilder
{
Server = this,
Queue = queue
};
if (requestMessage != null)
{
handlerBuilder.DeliveryHandlerHeader = requestMessage.FindHeader(HorseHeaders.DELIVERY_HANDLER);
handlerBuilder.Headers = requestMessage.Headers;
}
bool initialize;
//if queue creation is triggered by consumer subscription, we might skip initialization
if (requestMessage != null && requestMessage.Type == MessageType.Server && requestMessage.ContentType == KnownContentTypes.Subscribe)
{
initialize = statusSpecified;
}
else
{
initialize = true;
}
if (initialize)
{
IMessageDeliveryHandler deliveryHandler = await asyncHandler(handlerBuilder);
queue.InitializeQueue(deliveryHandler);
}
_queues.Add(queue);
foreach (IQueueEventHandler handler in _queueEventHandlers)
{
await handler.OnCreated(queue);
}
if (initialize)
{
handlerBuilder.TriggerAfterCompleted();
}
OnQueueCreated.Trigger(queue);
return(queue);
}
catch (Exception e)
{
SendError("CREATE_QUEUE", e, $"QueueName:{queueName}");
if (!hideException)
{
throw;
}
return(null);
}
finally
{
try
{
_createQueueLocker.Release();
}
catch
{
}
}
}
