Outbox for routing slip in statemachine?

Question

In one of my statemachine actions I create a routing slip to carry out a series of commands. This is done by calling

_busControl.Execute(routingSlip);

But sometimes the saga commit fails due to concurrency issues. Is there a "outbox" like mechanism to defer sending the routing slip to the bus until the saga is committed successfully?

Answer 1

Yes, you can use the outbox to defer sends:

http://masstransit-project.com/MassTransit/usage/exceptions.html#outbox

cfg.ReceiveEndpoint("input-queue", e =>
{
    e.UseInMemoryOutbox();

    e.StateMachineSaga(...);
});

You will, however, need to execute the routing slip using the ConsumeContext in the state machine event handler, and not using _busControl. IBus or IBusControl should never be used inside a consumer. The documentation has more details.