RabbitDemo —— 延迟队列（在消息上设置TTL）

Publish --> default exchange --> delay_queue(延迟队列) --> amq.direct --> message_ttl_queue(正常队列) --> Consumer

Procedure：

public class Procedure {
    private static String queue_name = "message_ttl_queue";  
    
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = Common.getFactory();
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        /**
         * RabbitMQ实现延迟队列二：在消息上设置TTL
         * Publish --> default exchange --> delay_queue(延迟队列) --> amq.direct --> message_ttl_queue(正常队列) --> Consumer
         */
        //延迟队列
        Map<String,Object> arguments = new HashMap<String,Object>();
        arguments.put("x-dead-letter-exchange", "amq.direct");//消息过期后会投递到amq.direct
        arguments.put("x-dead-letter-routing-key", "message_ttl_routingKey");//出现dead letter之后将重新按照指定的routing-key发送
        channel.queueDeclare("delay_queue", true, false, false, arguments);
        //正常队列
        channel.queueDeclare(queue_name, true, false, false, null);
        //绑定路由
        channel.queueBind(queue_name, "amq.direct", "message_ttl_routingKey");
        
        String msg = "hello:"+System.currentTimeMillis();
        //设置延迟属性
        AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder();
        //deliveryMode：将消息标记为持久（值为2）或瞬态（任何其他值）
        AMQP.BasicProperties properties = builder.expiration("10000").deliveryMode(2).build();
        channel.basicPublish("", "delay_queue", properties, 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 = "message_ttl_queue";  
    
    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = Common.getFactory();
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
        /**
         * RabbitMQ实现延迟队列二：在消息上设置TTL
         * Publish --> default exchange --> delay_queue(延迟队列) --> amq.direct --> message_ttl_queue(正常队列) --> Consumer
         */
        //延迟队列
        Map<String,Object> arguments = new HashMap<String,Object>();
        arguments.put("x-dead-letter-exchange", "amq.direct");//消息过期后会投递到amq.direct
        arguments.put("x-dead-letter-routing-key", "message_ttl_routingKey");//出现dead letter之后将重新按照指定的routing-key发送
        channel.queueDeclare("delay_queue", true, false, false, arguments);
        //正常队列
        channel.queueDeclare(queue_name, true, false, false, null);
        //绑定路由
        channel.queueBind(queue_name, "amq.direct", "message_ttl_routingKey");
        
        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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