Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about how to integrate RabbitMQ in Spring Boot. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

1. To put it simply, idempotency

Idempotency itself is a mathematical concept, even if the formula f (x) = f (f (x)) can hold. In the field of development, it means that for the same system, using the same conditions, the impact of one request and multiple requests on system resources is the same.

Idempotency is particularly important in distributed systems, because in distributed systems, we often use the function of interface call failure and retry, which leads to repeated calls to an interface using the same conditions. under such conditions, it is particularly important to ensure the idempotency of the interface.

Once you understand the problem, the solution is good. Common solutions are:

The MVCCToken mechanism is designed to reset the table.

MVCC is multi-version concurrency control. In this way, you need to compare the data version number held when the data is updated. If the version number is inconsistent, the operation will fail, so that each version will only have one chance to execute successfully. Once it fails, it must be reacquired. In this way, Brother Song can take the time to talk to you in detail.

Token is a widely used way at present, the core idea is that each operation has a unique credential token, once the execution is successful, for repeated requests, always return the same result.

two。 Micro personnel solution

Brother Song actually adopted this way of Token in the RabbitMQ consumer side of micro-personnel this time.

The general idea is as follows: first, change the message automatic confirmation mechanism of RabbitMQ to manual confirmation, and then whenever a message is consumed successfully, record the unique ID of the message on Redis, and then go to Redis to see if there is an ID of the message every time you receive a message. If so, it means that the message has been consumed and will no longer be processed, otherwise it will be processed.

The above is the editor for you to share how to integrate RabbitMQ in Spring Boot, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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