Multiple subscribers in NServiceBus

Question

Hi. I'm getting started with NServiceBus and have a question about the Pubsub sample.

My intention was to have multiple instances of Publisher1 running and receiving the message sent from the publisher. I also hacked the Publisher to only send messages of the eventMessage type.

But if I start the publisher and three instances of Subscriber1, only one of them gets the message at a time.

why is that? Is it a config setting or something else?

This is what I've tried which returns an exception "Exception when starting endpoint, error has been logged. Reason: Cannot configure property before the component has been configured. Please call 'Configure' first.":

using NServiceBus;

namespace Subscriber1 { public class EndpointConfig : IConfigureThisEndpoint, AsA_Server { }

public class OverrideInputQueue : IWantCustomInitialization
{
    public void Init()
    {
        Configure
            .Instance
            .Configurer
            .ConfigureProperty<NServiceBus.Config.MsmqTransportConfig>(t => t.InputQueue, "testQueue");
    }
}

}

/J

Answer 1

NServiceBus assumes that you have one input queue per process. Make sure that each of your subscribers are configured with a unique input queue. If not all three will be polling the same queue producing the behavior you're describing.

To do this you would probably have to copy paste sub1 to 3 different folders, modfying the app.config and start them up.

Hope this helps!