Tag Archives: CreateProcessor

Receiving a Message Using Azure.Messaging.ServiceBus

Azure.Messaging.ServiceBus is the latest SDK library that allows you to interface with Azure Service Bus.

In this post I wrote about receiving a message in Azure Service Bus using the Microsoft.Azure.ServiceBus library. Here, I’ll cover the method of receiving a message using Azure.Messaging.ServiceBus.

The first step is to create a ServiceBusClient instance:

_serviceBusClient = new ServiceBusClient(connectionString);

Once you’ve created this, the subsequent classes are created from there. This library draws a distinction between a message receiver and a message processor – the latter being event driven.

Receiving a Message

To receive a message:

            var messageReceiver = _serviceBusClient.CreateReceiver(QUEUE_NAME);            
            var message = await messageReceiver.ReceiveMessageAsync();

            //string messageBody = Encoding.UTF8.GetString(message.Body);
            string messageBody = message.Body.ToString();

It’s worth noting here that it is no longer necessary to decode the message body explicitly.

Processing a Message

This is the new version of registering a handler for the event, and it has a few additional features. Let’s see the code:

            var processor = _serviceBusClient.CreateProcessor(QUEUE_NAME);
            processor.ProcessMessageAsync += handleMessage;
            processor.ProcessErrorAsync += ExceptionHandler;

            await processor.StartProcessingAsync();                        

            await Task.Delay(2000);
            await processor.StopProcessingAsync();

We won’t worry too much about the events themselves for now, but the important events are StartProcessingAsync and StopProcessingAsync. Note that here we have a 2 second delay – this means that we will receive messages for two seconds, and then stop; obviously the start and stop don’t need to be in the same method.

References

https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-dotnet-get-started-with-queues