Home/ Questions/Q 8967385
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-15T17:13:54+00:00

For some reason I can not post to the masstransit google group , even

  • 0

For some reason I can not post to the masstransit google group, even though I joined, I am told that I do not have permission to post to this group. So I am going to post here…

Now for my problem:

I am using MassTransit v2.7.2, with AutoFac v2.6.3. I am trying to configure Autofac to scan an assembly and register my consumers; all types that implement the IConsumer interface. This seems to work.

I am using the MassTransit.AutofacIntegration assembly and the LoadFrom(...) extension method to register the consumers from the container with MassTransit when I configure the bus. Here is the code:

var builder = new ContainerBuilder();
builder
      .RegisterAssemblyTypes(typeof (CreateElectionCommandHandler).Assembly)
      .Where(type => type.Implements<IConsumer>())
      .AsSelf();
var container = builder.Build();

var localBus = ServiceBusFactory.New(configurator =>
                                         {
                                             //configurator.ReceiveFrom("loopback://localhost/testqueue");
                                             configurator.ReceiveFrom("rabbitmq://localhost/commandqueue");
                                             configurator.UseRabbitMq();
                                             configurator.Subscribe(sbc => sbc.LoadFrom(container));
                                         });

Assert.IsTrue(container.IsRegistered<CreateElectionCommandHandler>());
Assert.IsTrue(container.IsRegistered<TerminateElectionCommandHandler>());
Assert.AreEqual(1, localBus.HasSubscription<CreateElection>().Count());
Assert.AreEqual(1, localBus.HasSubscription<TerminateElection>().Count());

If I run the above code using the loopback

configurator.ReceiveFrom("loopback://localhost/testqueue");

configuration (comment out the rabbitmq conifig), the test will pass.

If I comment out the “loopback” config and comment in the 

 configurator.ReceiveFrom("rabbitmq://localhost/commandqueue");
 configurator.UseRabbitMq();

config, the test will fail. (Note: The rabbitmq queue is already up and running – I have been using it as part of my POC). Specifically, it will fail on the assertion:

Assert.AreEqual(1, localBus.HasSubscription<CreateElection>().Count());
Assert.AreEqual(1, localBus.HasSubscription<TerminateElection>().Count());

Can anybody help me understand what is going on here? I am new to MT so fully anticipating that I am missing something, or not configuring something correctly.

Am I correct to assume that if there are no message subscriptions registered, then the bus will not be able to deliver to any of my consumers (even though the consumers are registered)?

Any help much appreciated!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    With RabbitMQ, subscriptions are not added to the outbound bus until a message is published. This is due to how the classes are inspected and outbound endpoints to the appropriate exchanges are created and added to the pipeline.

    So yes, this test will fail with RabbitMQ, but it will in fact work properly when the message is published.

    The HasSubscription() calls are really meant for verifying that consumers and such are properly configured using the loopback transport, and really just for vetting out things that are not really integration issues but just making sure the internal MassTransit code is working.

    So, if you were to add a Publish() call of one of those types, and then call the HasSubscription() extension method, it would pass.

    • 0