RabbitMQ的Work能者多劳模式

Work能者多劳模式
一个消息生成者
一个队列，多个消息消费者

一个消息，只能被一个消费接收

关键代码

// 同一时刻服务器只会发一条消息给消费者
channel.basicQos(1);

Send

生产者

package cn.itcast.rabbitmq.work;

import cn.itcast.rabbitmq.util.ConnectionUtil;

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

public class Send {

    private final static String QUEUE_NAME = "test_queue_work";

    public static void main(String[] argv) throws Exception {
        // 获取到连接以及mq通道
        Connection connection = ConnectionUtil.getConnection();
        Channel channel = connection.createChannel();

        // 声明队列
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);

        for (int i = 0; i < 50; i++) {
            // 消息内容
            String message = "" + i;
            channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
            System.out.println(" [x] Sent '" + message + "'");

            Thread.sleep(i * 10);
        }

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

Recv

消费者1

package cn.itcast.rabbitmq.work;

import cn.itcast.rabbitmq.util.ConnectionUtil;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.QueueingConsumer;

public class Recv {

    private final static String QUEUE_NAME = "test_queue_work";

    public static void main(String[] argv) throws Exception {

        // 获取到连接以及mq通道
        Connection connection = ConnectionUtil.getConnection();
        Channel channel = connection.createChannel();

        // 声明队列
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);

        // 同一时刻服务器只会发一条消息给消费者
        channel.basicQos(1);

        // 定义队列的消费者
        QueueingConsumer consumer = new QueueingConsumer(channel);
        // 监听队列，手动返回完成
        channel.basicConsume(QUEUE_NAME, false, consumer);

        // 获取消息
        while (true) {
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String message = new String(delivery.getBody());
            System.out.println(" [x] Received '" + message + "'");
            //休眠
            Thread.sleep(10);
            // 返回确认状态
            channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
        }
    }
}

Recv2

消费者2

package cn.itcast.rabbitmq.work;

import cn.itcast.rabbitmq.util.ConnectionUtil;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.QueueingConsumer;

public class Recv2 {

    private final static String QUEUE_NAME = "test_queue_work";

    public static void main(String[] argv) throws Exception {

        // 获取到连接以及mq通道
        Connection connection = ConnectionUtil.getConnection();
        Channel channel = connection.createChannel();

        // 声明队列
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);

        // 同一时刻服务器只会发一条消息给消费者
        channel.basicQos(1);

        // 定义队列的消费者
        QueueingConsumer consumer = new QueueingConsumer(channel);
        // 监听队列，手动返回完成状态
        channel.basicConsume(QUEUE_NAME, false, consumer);

        // 获取消息
        while (true) {
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String message = new String(delivery.getBody());
            System.out.println(" [x] Received '" + message + "'");
            // 休眠1秒
            Thread.sleep(1000);

            channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
        }
    }
}

消费者1
接收消息，休眠10毫秒
消费者2
接收消息，休眠1000毫秒

测试结果

一共发送50条消息

消费者1
获取的多

消费者2
获取的少