What is RabbitMQ? A brief introduction to RabbitMQ

The content of this article is to introduce RabbitMQ and let everyone know some related knowledge of RabbitMQ. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

RabbitMQ Overview

RabbitMQ is a high-performance distributed messaging middleware. It is written by Erlang, a language that inherently supports distribution and has extremely high performance (but is difficult to get started).

Communication Concept

RabbitMQ is simply a queue service. Our producers continue to deliver messages to it, and consumers continue to Get messages from it. But compared to simple queues such as List using redis, RabbitMQ's message delivery is more flexible. First, you need to know some communication concepts in RabbitMQ:

● Exchange (exchanger)

● Queue (queue): message queue carrier, each message will be put into one or more queues .

● Binding: Its function is to bind exchange and queue according to routing rules.

● Routing key: Exchange delivers messages based on this keyword.

● vhost (virtual host): Under different vhosts, data is completely isolated. The default vhost is "/"

● Channel (channel): Under one tcp connection, multiple channel, each channel represents a session task.

●producer

●consumer

Exchange in RabbitMQ is similar to a router, our consumer will not deliver the message directly to the queue, but to exchange, and exchange will be sent to a specific queue based on the routing key when we deliver. This design allows messages to be flexibly routed and sent to a certain type of queue, forming a one-to-many relationship instead of just one-to-one.

Exchange

So exchange in RabbitMQ is very convenient and powerful. It has several types:

●direct

●fanout

●topic

●headers (almost never used)

directThe exchanger is very simple. Sometimes we just need a very simple queue (deliver the message into it and then continue to consume it). At this time we can use the directexchanger. Its rule is: If If the routing key matches, the message will be delivered to the corresponding queue.

fanout The switch ignores the routing key and sends the message to a batch of queues simultaneously .

topic is to send messages to a certain type of queue based on different routing keys.

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