背景

普通消息队列，消息一旦入队就会被消费者立刻消费,而延迟队列则需要指定固定时间后被延迟消费.

Docker安装rabbitMq延迟队列插件版本

学习的话可以去官网下载rabbitmq并通过安装插件的方式安装延迟队列 插件地址：
https://www.rabbitmq.com/community-plugins.html

但我们这里使用现成的镜像就可以简单学习

docker镜像下载,使用docker-compose编排运行

docker pull lianlianyi/rabbitmq

  rabbitmq:
    image: lianlianyi/rabbitmq:3.9.13-management-alpine-delayed
    ports:
      - 15672:15672
      - 5672:5672
    environment:
      - TIME_ZONE=Asia/ShanghAI
      #用户
      - RABBITMQ_DEFAULT_USER=admin
      #密码
      - RABBITMQ_DEFAULT_PASS=admin
    volumes:
      - /etc/localtime:/etc/localtime
      - /etc/timezone:/etc/timezone
      - ./data/rabbitmq/db:/var/lib/rabbitmq/mnesia/rabbit@my-rabbit

启动验证

交换机有出现 x-delayed-message 字样表示插件运行成功

springboot 对接rabbitmq队列

1. 添加依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

2.Application.xml

rabbitmq:
    host: 127.0.0.1
    port: 5672
    username: admin
    password: admin
    virtual-host: /
    publisher-returns: true #开启发送失败返回
    publisher-confirm-type: correlated #配置确认回调
    listener:
      simple:
        acknowledge-mode: auto #开启ack
        concurrency: 5 #指定最小的消费者数量.
        max-concurrency: 10 #指定最大的消费者数量.
        prefetch: 1 # 最多一次消费多少条数据 -限流
      direct:
        acknowledge-mode: auto
    #支持消息的确认与返回
    template:
      mandatory: true

生产者伪代码

rabbitTemplate.convertAndSend(DELAYED_EXCHANGE_NAME, DELAYED_ROUTING_KEY, msg, correlationDate -> {
    //延迟3秒
    correlationDate.getMessageProperties().setDelay(1000 * 3);
    return correlationDate;
});
log.info("生产者发送时间:{},msg:{}", DateUtil.formatDateTime(new Date()),msg);

消费者伪代码

@RabbitListener(queuesToDeclare = @Queue(MsgProduct.DELAYED_QUEUE_NAME))
public void receive(@Payload MsgDemo msgDemo, Message message, Channel channel) {
    log.info("调用消费者时间:{},MSG:{}¨", DateUtil.formatDateTime(new Date()),msgDemo);
}

本文涉及到的demo

https://Github.com/lianlianyi/toutiao_demo