![]() We ran into issues testing consumers that in turn make asynchronous calls. We are using MassTransit asynchronous messaging (on top of RabbitMQ) for our microservice architecture. Use the docker-compose.yml file to startup RabbitMQ and Postgres, then run the service. Using the ConfigureEndpoints method will automatically create a receive endpoint for every added consumer, saga, and activity. MassTransit includes an endpoint name formatter (IEndpointNameFormatter) which can be used to automatically format endpoint names based upon the consumer, saga, or activity name. The sample was based off of Microsoft's chat sample (opens new window), which is nearly identical to the tutorial here (opens new window), except the only different is it's stripped down to the bare minimum (no razor Pages, bootstrap or JQuery libraries). You can view the MassTransit Sample here (opens new window). MassTransit includes many consumer types, including consumers, sagas, saga state machines, routing slip activities, handlers, and job consumers. In MassTransit, a consumer consumes one or more message types when configured on or connected to a receive endpoint. Consumer is a widely used noun for something that consumes something. MassTransit makes it easy to create applications and services that leverage message-based, loosely-coupled asynchronous communication for higher availability, reliability, and scalability. MassTransit is a free, open-source distributed application framework for. Show how competing consumers work with MassTransit and RabbitMq Resources. Remember this diagram from our clustering article illustrating how each machine has its own RabbitMQ instance: Clearly, this is not what we want. Each queue will get a copy of the same message routed to it. Since each instance will have its own queue, then MassTransit will treat each queue as a unique consumer as opposed to competing consumers. When the bus starts, it will empty the queue of all messages. Set PurgeOnStartup=true in the endpoint configuration. Note that each of these imply you would never use a 'competing consumer' pattern, so make sure that is the case. If you want competing consumers have multiple instances of the consumer running against the same queue. ![]() The receiver/consumer and publisher cannot be on the same queue.
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