RabbitMq延时队列的实现

RabbitMq延时队列的实现

消息的TTL和死信Exchange

消息的TTL

死信Exchange

延时队列的两个实现

在spring boot中创建延时队列

设计建议规范

延时队列模型

一个交换机，一条延时队列，一条普通队列，

创建延时队列

    @Bean
    public Queue orderDelayQueue() {
        Map<String, Object> arguments = new HashMap<>();
         //存放参数
        //死信路由
        arguments.put("x-dead-letter-exchange", "order-event-exchange");
        //死信路由键
        arguments.put("x-dead-letter-routing-key", "order.release.order");
        //过期时间
        arguments.put("x-message-ttl", 60000);
        
        Queue queue = new Queue("order.delay.queue", true, false, false, arguments);

        return queue;
    }

创建普通队列

	@Bean
    public Queue orderReleaseOrderQueue() {
        Queue queue = new Queue("order.release.order.queue", true, false, false);
        return queue;
    }

创建交换机

    @Bean
    public Exchange orderEventExchange() {
        return new TopicExchange("order-event-exchange", true, false);
    }

创建binding

@Bean
public Binding orderCreateOrderBinding(){
	return new Binding("order.delay.queue",Binding.DestinationType.QUEUE,"order-event-exchange","order.create.order",null);
}

@Bean
public Binding orderReleaseOrderBinding(){
	return new Binding("order.release.order.queue",Binding.DestinationType.QUEUE,"order-event-exchange","order.release.order",null);
}

测试-发送消息

    @Autowired
    RabbitTemplate rabbitTemplate;

    @GetMapping("/test")
    public String creatOrderTest(){
        //订单下单成功
        OrderEntity entity=new OrderEntity();
        entity.setOrderSn(UUID.randomUUID().toString());

        //给MQ发送消息
        rabbitTemplate.convertAndSend("order-event-exchange","order.create.order",entity);
        return "ok";
    }

测试-接收消息

这里 @RabbitListener注解设置了手动确认属性，ackMode="MANUAL"也可以替换为在配置文件properties中设置spring.rabbitmq.listener.simple.acknowledge-mode=manual。

RabbitMq默认是自动确认模式。

    @RabbitListener(queues="order.release.order.queue",ackMode="MANUAL")
    public void listener(OrderEntity entity, Channel channel, Message message) throws IOException {
        System.out.println("收到过期的订单消息：准备关闭订单");
        //手动确认
        channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
    }