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This article mainly introduces the RPC mode in AMQP-RabbitMQ and the example analysis of the results of message processing. It has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

6. RPC

But what if we need to run a function on a remote computer and wait for the result? Well, that's a different story. This pattern is commonly known as Remote Procedure Call or RPC.

The general meaning is that the above modes are all that producers send messages to Rabbitmq, and then they don't care, whether consumers consume them or not, and what the result of consumption is. The above scenarios are sufficient for most needs. But there is a scenario where producers must know the outcome of consumption before they can proceed,

illustrates

Our RPC will work like this:

For an RPC request, the Client sends a message with two properties: replyTo, which is set to a anonymous exclusive queue created just for the request, and correlationId, which is set to a unique value for every request.

The request is sent to an rpc_queue queue.

The RPC worker (aka: server) is waiting for requests on that queue. When a request appears, it does the job and sends a message with the result back to the Client, using the queue from the replyTo field.

The client waits for data on the reply queue. When a message appears, it checks the correlationId property. If it matches the value from the request it returns the response to the application.

Thank you for reading this article carefully. I hope that Xiaobian's "Sample Analysis of RPC Mode and Attention Message Processing Results in AMQP-RabbitMQ" will be helpful to everyone. At the same time, I hope that everyone will support you a lot and pay attention to the industry information channel. More relevant knowledge is waiting for you to learn!

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