TTL

time to live,即生存時間

RabbitMQ 支援訊息的過期時間，可以在發訊息是指定

RabbitMQ 支援佇列的過期時間，從訊息入隊開始計算，只要超過了佇列的超時時間配置，那麼訊息會自動清除

程式碼

package com.wyg.rabbitmq.javaclient.ttl;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import
 
 com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

/**
 * ttl佇列/訊息
 * 
 * @author [email protected]
 * @date 2019-11-22 13:25
 * @since JDK1.8
 * @version V1.0
 */

public class Producer {
    private static final
 
 String HOST = "localhost";
    private static final int PORT = 5672;
    private static final String USERNAME = "guset";
    private static final String PASSWORD = "guset";

    public static void main(String[] args) throws IOException,TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost(HOST);
        factory.setVirtualHost("/"
 
);
        factory.setPort(PORT);
        factory.setUsername(USERNAME);
        factory.setPassword(PASSWORD);
        Connection connection = factory.newConnection();

        Channel channel = connection.createChannel();
        String exchangeName = "test_ttl_exchange";
        String routingKey = "ttl.abc";
        String queueName = "test_ttl_queue";

        // 申明exchange
        channel.exchangeDeclare(exchangeName,"topic");
        // 申明 queue
        channel.queueDeclare(queueName,true,false,null);

        Map<String,Object> arguments = new HashMap<>();
        // 佇列ttl，設定為8s
        arguments.put("message-ttl",8000);
        channel.queueBind(queueName,exchangeName,routingKey,arguments);

        for (int i = 0; i < 3; i++) {
            // expiration("10000") 設定訊息8s過期,訊息的ttl
            AMQP.BasicProperties props = new AMQP.BasicProperties.Builder().deliveryMode(2).contentEncoding("UTF-8")
                .expiration("8000").build();

            String msg = "這是第" + i + "條ack訊息";
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            channel.basicPublish(exchangeName,props,msg.getBytes("UTF-8"));
        }

        channel.close();
        connection.close();
    }

}

複製程式碼

執行結果(動圖)，觀察管理控制檯，到期自動清除