MassTransit via MSMQ is not working, why?

Question

Here is my code for MassTransit.

The subscriber console app:

namespace ConsoleSubscriber
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("set up a subscriber");

            Bus.Initialize(config =>
            {
                config.UseMsmq();
                config.VerifyMsmqConfiguration();
                config.UseMulticastSubscriptionClient();
                config.UseControlBus();
                config.ReceiveFrom("msmq://localhost/test_end");
                config.Subscribe(s => s.Instance(new Consumer()).Permanent());                    
            });

            Console.Read();
        }         
    }

    public class Consumer : Consumes<Message>.All
    {
        public void Consume(Message message)
        {
            Console.WriteLine("start consuming message");

            if (string.IsNullOrEmpty(message.Ids))
            {
                Console.WriteLine("no ids");     
            }
            else
            {
                Console.WriteLine("ids are " + message.Ids);
            }
        }
    }
}

Message class:

[Serializable]
public class Message
{
    public string Ids { get; set; }
}

The publisher console app:

namespace ConsolePublisher
{
    class Program
    {
        static void Main(string[] args)
        {                
            Console.WriteLine("start publishing");

            // initialize bus 
            Bus.Initialize(config =>
            {
                config.UseMsmq();
                config.VerifyMsmqConfiguration();
                config.UseMulticastSubscriptionClient();
                config.UseControlBus();
                config.ReceiveFrom("msmq://localhost/test_queue");
            });

            Bus.Instance.Publish(new Message());
            Console.WriteLine("Message sent 1");

            var msg2 = new Message() { Ids ="1,2,3,4" };
            Bus.Instance.Publish(msg2);
            Console.WriteLine("Message sent 2");

            Console.Read();    
        }
    }
}

When I run these two console applications, it seems the messages are not picked up by the consumer. Any ideas?

Cheers!

Answer 1

Try putting a sleep in before calling publish. Multicast subscriptions can take a moment to get configured as the two instances are talking to each other. Also ensure you started the consumer before the publisher. Also replacing config.Subscribe(s => s.Instance(new Consumer()).Permanent()); with config.Subscribe<Consumer>(); might help.

There are other routing methods that can keep the subscription data between restarts of the process once you move forward. I would start to look at using the Subscription Service, static routing, or just using RabbitMQ once you get a handle on this.