RocketMQ-广播模式消费

2022-10-24 07:13:57

Rocketmq 消费者默认是集群的方式消费的，消费者还可以用广播的模式进行消费。广播模式消费就是所有订阅同一个主题的消费者都会收到消息。代码实现上其实很简单，就是在消费端添加

consumer.setMessageModel(MessageModel.BROADCASTING);

就可以了。我们看实验步骤：

一、启动ConsumerBroadCastMember1

二、启动ConsumerBroadCastMember2

三、运行ProducerBraodCast

四、我们可以看到两个Consumer都收到了同样的消息。

Producer端：

package org.hope.lee.producer;

import com.alibaba.rocketmq.client.exception.MQBrokerException;

import com.alibaba.rocketmq.client.exception.MQClientException;

import com.alibaba.rocketmq.client.producer.DefaultMQProducer;

import com.alibaba.rocketmq.client.producer.SendCallback;

import com.alibaba.rocketmq.client.producer.SendResult;

import com.alibaba.rocketmq.common.message.Message;

import com.alibaba.rocketmq.common.message.MessageQueue;

import com.alibaba.rocketmq.remoting.exception.RemotingException;

public class ProducerBroadCast {

    public static void main(String[] args) {

        DefaultMQProducer producer = new DefaultMQProducer("push_consumer");

        producer.setNamesrvAddr("192.168.31.176:9876;192.168.31.165:9876");

        try {

            // 设置实例名称

            producer.setInstanceName("producer_broadcast");

            // 设置重试次数

            producer.setRetryTimesWhenSendFailed(3);

            // 开启生产者

            producer.start();

            // 创建一条消息

            Message msg = new Message("topic_broadcast", "TagA", "OrderID0034", "message_broadcast_test".getBytes());

            SendResult send = producer.send(msg);

            System.out.println("id:--->" + send.getMsgId() + ",result:--->" + send.getSendStatus());

        } catch (MQClientException e) {

            e.printStackTrace();

        } catch (RemotingException e) {

            e.printStackTrace();

        } catch (MQBrokerException e) {

            e.printStackTrace();

        } catch (InterruptedException e) {

            e.printStackTrace();

        }

        producer.shutdown();

    }

}

Consumer端：

package org.hope.lee.consumer;

import java.util.List;

import com.alibaba.rocketmq.client.consumer.DefaultMQPushConsumer;

import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;

import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;

import com.alibaba.rocketmq.client.consumer.listener.MessageListenerConcurrently;

import com.alibaba.rocketmq.client.exception.MQClientException;

import com.alibaba.rocketmq.common.consumer.ConsumeFromWhere;

import com.alibaba.rocketmq.common.message.MessageExt;

import com.alibaba.rocketmq.common.protocol.heartbeat.MessageModel;

public class ConsumerBroadCastMember1 {

    public static void main(String[] args) throws MQClientException {

        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("consumer_broadcast");

        consumer.setNamesrvAddr("192.168.31.176:9876;192.168.31.165:9876");

        // 批量消费,每次拉取10条

        consumer.setConsumeMessageBatchMaxSize(10);

        //设置广播消费

        consumer.setMessageModel(MessageModel.BROADCASTING);

        //设置集群消费

//        consumer.setMessageModel(MessageModel.CLUSTERING);

        // 如果非第一次启动，那么按照上次消费的位置继续消费

        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);

        // 订阅PushTopic下Tag为push的消息

        consumer.subscribe("topic_broadcast", "TagA || Tag B || Tage C");

        consumer.registerMessageListener(new MqBroadCastListener());

        consumer.start();

        System.out.println("Consumer1 Started.");

    }

}

class MqBroadCastListener implements MessageListenerConcurrently{

    public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {

        try {

            MessageExt msg = msgs.get(0);

            String msgBody = new String(msg.getBody(), "utf-8");

            System.out.println("msgBody:" + msgBody);

        } catch(Exception e) {

            e.printStackTrace();

            return ConsumeConcurrentlyStatus.RECONSUME_LATER;

        }

        return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;

    }

}

package org.hope.lee.consumer;

import java.util.List;

import com.alibaba.rocketmq.client.consumer.DefaultMQPushConsumer;

import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;

import com.alibaba.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;

import com.alibaba.rocketmq.client.consumer.listener.MessageListenerConcurrently;

import com.alibaba.rocketmq.client.exception.MQClientException;

import com.alibaba.rocketmq.common.consumer.ConsumeFromWhere;

import com.alibaba.rocketmq.common.message.MessageExt;

import com.alibaba.rocketmq.common.protocol.heartbeat.MessageModel;

public class ConsumerBroadCastMember2 {

    public static void main(String[] args) throws MQClientException {

        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("consumer_broadcast");

        consumer.setNamesrvAddr("192.168.31.176:9876;192.168.31.165:9876");

        // 批量消费,每次拉取10条

        consumer.setConsumeMessageBatchMaxSize(10);

        //设置广播消费

        consumer.setMessageModel(MessageModel.BROADCASTING);

        //设置集群消费

//        consumer.setMessageModel(MessageModel.CLUSTERING);

        // 如果非第一次启动，那么按照上次消费的位置继续消费

        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);

        // 订阅PushTopic下Tag为push的消息

        consumer.subscribe("topic_broadcast", "TagA || Tag B || Tage C");

        consumer.registerMessageListener(new MqBroadCastListener());

        consumer.start();

        System.out.println("Consumer2 Started.");

    }

}

结果：

https://gitee.com/huayicompany/RocketMQ-learn/tree/master/rocketmq-api

码农公寓

相关文章