Rabbitmq 延时消息

原理网上一大堆，比我说的清楚，大家可以去看看，这里就不说了。

安装配置

注意 plugins 的处理，因为需要安装一个 rabbitmq_delayed_message_exchange 插件，在 3.7.13 版本中无法使用 rabbitmq-plugins enable rabbitmq_delayed_message_exchange 进行安装，会提示找不到，所以只能自己上 https://www.rabbitmq.com/plugins.html 去下载。

version: '3.1'
services:
  rabbitmq:
    restart: always
    image: rabbitmq:management
    container_name: rabbitmq
    ports:
      - 5672:5672
      - 15672:15672
    environment:
      TZ: Asia/Shanghai
      RABBITMQ_DEFAULT_USER: admin
      RABBITMQ_DEFAULT_PASS: admin
    volumes:
      - ./data:/var/lib/rabbitmq
      - ./data:/etc/rabbitmq
      - ./plugins:/plugins

在处理plugins之后，注意配置一下 enabled_plugins

[rabbitmq_management,rabbitmq_delayed_message_exchange].

使用

配置delayExchange，队列，并且绑定。

@Configuration
public class RabbitConfig {

    @Bean
    public FanoutExchange delayExchange() {
        HashMap<String, Object> args = new HashMap<>();
        args.put("x-delayed-type", "direct");
        FanoutExchange topicExchange = new FanoutExchange("delay_exchange", true, false, args);
        topicExchange.setDelayed(true);
        return topicExchange;
    }

    @Bean
    public Queue queue() {
        Queue queue = new Queue("delay_queue");
        return queue;
    }

    @Bean
    public Binding binding() {
        return BindingBuilder.bind(queue()).to(delayExchange());
    }
}

发送消息

rabbitTemplate.convertAndSend("delay_exchange", queue, msg, message -> {
    message.getMessageProperties().setDeliveryMode(MessageDeliveryMode.PERSISTENT);
    // 这里的时间用来设置延时多久
    message.getMessageProperties().setHeader("x-delay", 30000);
    return message;
});

接收消息

@Component
public class MessageReceiver {
    @RabbitListener(queues = "delay_queue")
    public void receive(String msg) {
        System.out.println("接收到的消息:"+msg);
    }
}