RabbitDemo —— 延迟队列（在队列上设置TTL）

Publish --> delaysync.exchange --> delay.5m.queue(延迟队列) --> delay.exchange --> test.queue(正常队列) --> Consumer

Procedure：

public class Procedure {
    private static final String queue_name = "test.queue";
    
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = Common.getFactory();
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        /**
         * RabbitMQ实现延迟队列一：在队列上设置TTL
         * Publish --> delaysync.exchange --> delay.5m.queue(延迟队列) --> delay.exchange --> test.queue(正常队列) --> Consumer
         */
        channel.exchangeDeclare("delay.exchange", "topic", true, false, false, null);
        //延迟队列start
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("x-message-ttl", 10000);//消息过期时间
        map.put("x-max-length", 500000);//最大积压的消息个数
        map.put("x-dead-letter-exchange", "delay.exchange");//消息过期后会投递到delay.exchange
        channel.queueDeclare("delay.5m.queue", true, false, false, map);
        channel.exchangeDeclare("delaysync.exchange", "topic", true, false, false, null);
        channel.queueBind("delay.5m.queue", "delaysync.exchange", "deal.message");
        //正常队列
        channel.queueDeclare(queue_name, true, false, false, null);
        channel.queueBind(queue_name, "delay.exchange", "deal.message");
        
        System.out.println("send start");
        
        String msg = "hello!+"+new Date().toString();
        channel.basicPublish("delaysync.exchange", "deal.message", false, false, null, msg.getBytes());
        System.out.println("send msg:"+msg);
        
        channel.close();
        connection.close();
    }
}

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Consumers：

public class Consumers {
    private static String queue_name = "test.queue";  
    
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = Common.getFactory();
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        /**
         * RabbitMQ实现延迟队列一：在队列上设置TTL
         * Publish --> delaysync.exchange --> delay.5m.queue(延迟队列) --> delay.exchange --> test.queue(正常队列) --> Consumer
         */
        channel.exchangeDeclare("delay.exchange", "topic", true, false, false, null);
        //延迟队列start
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("x-message-ttl", 10000);//消息过期时间
        map.put("x-max-length", 500000);//最大积压的消息个数
        map.put("x-dead-letter-exchange", "delay.exchange");//消息过期后会投递到delay.exchange
        channel.queueDeclare("delay.5m.queue", true, false, false, map);
        channel.exchangeDeclare("delaysync.exchange", "topic", true, false, false, null);
        channel.queueBind("delay.5m.queue", "delaysync.exchange", "deal.message");
        //正常队列
        channel.queueDeclare(queue_name, true, false, false, null);
        channel.queueBind(queue_name, "delay.exchange", "deal.message");
        
        System.out.println("receive start");
        
        Consumer consumer = new DefaultConsumer(channel) {
            public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
                    throws IOException {
                System.out.println("receive msg:"+new String(body));
                try {
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        };
        channel.basicConsume(queue_name, false, consumer);
    }
}

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