TTL队列/消息

TTL队列/消息

TTL: Time To Live, 生存时间

• RabbitMQ支持消息的过期时间, 在消息发送时可以指定
• RabbitMQ支持队列的过期时间, 从消息进入队列开始计算, 只要超过了队列的超时时间配置, 那么消息会被自动清除

TTL队列代码实现

消费者

代码语言：javascript复制

package com.dance.redis.mq.rabbit.ttl;

import com.dance.redis.mq.rabbit.RabbitMQHelper;
import com.rabbitmq.client.*;

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

public class Receiver4TTLExchange {

    public static void main(String[] args) throws Exception {
        // TTL队列
        Channel channel = RabbitMQHelper.getChannel();
        // 声明正常的 exchange queue 路由规则
        String queueName = "test_ttl_queue";
        String exchangeName = "test_ttl_exchange";
        String exchangeType = "topic";
        String routingKey = "ttl.*";
        RabbitMQHelper.exchangeDeclare(channel, exchangeName, RabbitMQHelper.EXCHANGE_TYPE_TOPIC);

        Map<String, Object> arguments = new HashMap<>();
        // 指定队列的消息过期时间
        arguments.put("x-message-ttl", 6000);
        // 添加队列扩展参数
        RabbitMQHelper.queueDeclare(channel, queueName, true, arguments);
        channel.queueBind(queueName, exchangeName, routingKey);
        Consumer consumer = new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) {
                System.out.println("receive message:"   new String(body)   ", RoutingKey: "   envelope.getRoutingKey());
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
        channel.basicConsume(queueName, false, consumer);
        TimeUnit.SECONDS.sleep(50);
        channel.close();
        RabbitMQHelper.closeConnection();
    }
}

生产者

代码语言：javascript复制

package com.dance.redis.mq.rabbit.ttl;

import com.dance.redis.mq.rabbit.RabbitMQHelper;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;

import java.util.HashMap;
import java.util.Map;

public class Sender4TTLExchange {


    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMQHelper.getChannel();
        String exchangeName = "test_ttl_exchange";
        String routingKey = "ttl.test";
        Map<String, Object> headers = new HashMap<>();
        AMQP.BasicProperties props = new AMQP.BasicProperties.Builder()
                .deliveryMode(2)
                .contentEncoding("UTF-8")
                .headers(headers).build();
        String msg = "Hello World RabbitMQ 4 TTL Exchange Message ... ";
        channel.basicPublish(exchangeName, routingKey, props, msg.getBytes());
    }

}

TTL队列测试

启动消费者

启动生产者

查看消费者

消费成功

此时, 停止消费者, 查看控制台

从队列上的标记features, 也可以看到这是一个TTL队列

队列中是没有消息的,不要启动消费者, 直接启动生产者发送一条消息

查看控制台

可以看到有一条消息, 等待6秒再次查看

消息已经被删除

TTL消息代码实现

消费者

代码语言：javascript复制

package com.dance.redis.mq.rabbit.ttl.message;

import com.dance.redis.mq.rabbit.RabbitMQHelper;
import com.rabbitmq.client.*;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class Receiver4TTLExchange {

    public static void main(String[] args) throws Exception {
        // TTL队列
        Channel channel = RabbitMQHelper.getChannel();
        // 声明正常的 exchange queue 路由规则
        String queueName = "test_ttl_queue_message";
        String exchangeName = "test_ttl_exchange_message";
        String routingKey = "ttl.message.*";
        RabbitMQHelper.exchangeDeclare(channel, exchangeName, RabbitMQHelper.EXCHANGE_TYPE_TOPIC);
        RabbitMQHelper.queueDeclare(channel, queueName, true, null);
        channel.queueBind(queueName, exchangeName, routingKey);
        Consumer consumer = new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) {
                System.out.println("receive message:"   new String(body)   ", RoutingKey: "   envelope.getRoutingKey());
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
        channel.basicConsume(queueName, false, consumer);
        TimeUnit.SECONDS.sleep(50);
        channel.close();
        RabbitMQHelper.closeConnection();
    }
}

生产者

代码语言：javascript复制

package com.dance.redis.mq.rabbit.ttl.message;

import com.dance.redis.mq.rabbit.RabbitMQHelper;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;

import java.util.HashMap;
import java.util.Map;

public class Sender4TTLExchange {

    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMQHelper.getChannel();
        String exchangeName = "test_ttl_exchange_message";
        String routingKey = "ttl.message.test";
        Map<String, Object> headers = new HashMap<>();
        AMQP.BasicProperties props = new AMQP.BasicProperties.Builder()
                .deliveryMode(2)
                .contentEncoding("UTF-8")
                // TTL 消息时间 10秒
                .expiration("10000")
                .headers(headers).build();
        String msg = "Hello World RabbitMQ 4 TTL Exchange Message ... ";
        channel.basicPublish(exchangeName, routingKey, props, msg.getBytes());
    }

}

TTL消息测试

启动消费者

启动生产者

查看消费者

消费成功, 此时停止消费者, 查看控制台

队列上并没有TTL标记, 所以这不是TTL队列, 这个时候不要启动消费者, 直接启动生产者, 发送一条消息

可以看到有了一条消息, 等待10秒

消息没有了, 消息已被删除

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