public DurableSender(MessagingFactory messagingFactory, string serviceBusQueueName)
{
// Create a Service Bus queue client to send messages to the Service Bus queue.
this.queueClient = messagingFactory.CreateQueueClient(serviceBusQueueName);
// Create MSMQ queue if it doesn't exit. If it does, open the existing MSMQ queue.
this.msmqQueue = MsmqHelper.GetMsmqQueue(MsmqHelper.CreateMsmqQueueName(messagingFactory.Address.DnsSafeHost, serviceBusQueueName, "SEND"));
// Create MSMQ deadletter queue if it doesn't exit. If it does, open the existing MSMQ deadletter queue.
this.msmqDeadletterQueue = MsmqHelper.GetMsmqQueue(MsmqHelper.CreateMsmqQueueName(messagingFactory.Address.DnsSafeHost, serviceBusQueueName, "SEND_DEADLETTER"));
// Start receiving messages from the MSMQ queue.
this.MsmqPeekBegin();
}
void MsmqOnPeekComplete(IAsyncResult result)
{
// Complete the MSMQ peek operation. If a timeout occured, peek again.
Message msmqMessage = null;
try
{
msmqMessage = this.msmqQueue.EndPeek(result);
}
catch (MessageQueueException ex)
{
if (ex.MessageQueueErrorCode == MessageQueueErrorCode.IOTimeout)
{
this.MsmqPeekBegin();
return;
}
}
if (msmqMessage != null)
{
var brokeredMessage = MsmqHelper.UnpackServiceBusMessageFromMsmqMessage(msmqMessage);
// Clone Service Bus message in case we need to deadletter it.
var serviceBusDeadletterMessage = brokeredMessage.Clone();
Trace.TraceInformation("DurableSender: Enqueue message {0} into Service Bus.", msmqMessage.Label);
switch (this.SendMessageToServiceBus(brokeredMessage))
{
case SendResult.Success: // Message was successfully sent to Service Bus. Remove MSMQ message from MSMQ queue.
Trace.TraceInformation("DurableSender: Service Bus send operation completed.");
this.msmqQueue.BeginReceive(TimeSpan.FromSeconds(60), null, this.MsmqOnReceiveComplete);
break;
case SendResult.WaitAndRetry: // Service Bus is temporarily unavailable. Wait.
Trace.TraceWarning("DurableSender: Service Bus is temporarily unavailable.");
this.waitAfterErrorTimer = new Timer(
this.ResumeSendingMessagesToServiceBus,
null,
WaitTimeAfterServiceBusReturnsAnIntermittentErrorInSeconds * 1000,
Timeout.Infinite);
break;
case SendResult.PermanentFailure: // Permanent error. Deadletter MSMQ message.
Trace.TraceError("DurableSender: Permanent error when sending message to Service Bus. Deadletter message.");
var msmqDeadletterMessage = MsmqHelper.PackServiceBusMessageIntoMsmqMessage(serviceBusDeadletterMessage);
try
{
this.SendtoMsmq(this.msmqDeadletterQueue, msmqDeadletterMessage);
}
catch (Exception ex)
{
Trace.TraceError(
"DurableSender: Failure when sending message {0} to deadletter queue {1}: {2} {3}",
msmqDeadletterMessage.Label, this.msmqDeadletterQueue.FormatName,
ex.GetType(),
ex.Message);
}
this.msmqQueue.BeginReceive(TimeSpan.FromSeconds(60), null, this.MsmqOnReceiveComplete);
break;
}
}
}
public void Send(BrokeredMessage brokeredMessage)
{
var msmqMessage = MsmqHelper.PackServiceBusMessageIntoMsmqMessage(brokeredMessage);
this.SendtoMsmq(this.msmqQueue, msmqMessage);
}