[系统运维] RocketMQ消费消息(负载均衡模式和广播模式)

开发: C++知识库 Java知识库 JavaScript Python PHP知识库人工智能区块链大数据移动开发嵌入式开发工具数据结构与算法开发测试游戏开发网络协议系统运维
教程: HTML教程 CSS教程 JavaScript教程 Go语言教程 JQuery教程 VUE教程 VUE3教程 Bootstrap教程 SQL数据库教程 C语言教程 C++教程 Java教程 Python教程 Python3教程 C#教程
数码: 电脑笔记本显卡显示器固态硬盘硬盘耳机手机 iphone vivo oppo 小米华为单反装机图拉丁

-> 系统运维 -> RocketMQ消费消息(负载均衡模式和广播模式) -> 正文阅读

[系统运维]RocketMQ消费消息(负载均衡模式和广播模式)

?一、测试用例

package com.mq.rocket.consumer;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.message.MessageExt;

import java.util.List;

/**
 * 消息接收者
 */
public class Consumer {
    public static void main(String[] args) throws MQClientException {
        // 1.创建消费者consumer，指定消费者组名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group1");
        // 2.指定Nameserver地址
        consumer.setNamesrvAddr("127.0.0.1:9876");
        // 设置超时
        consumer.setConsumeTimeout(15000);
        // 3.订阅主题topic和tag
        consumer.subscribe("topic1", "tag1");
        // 4.设置回调函数,处理消息
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            // 接收消息内容
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgList, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                for (MessageExt msg:msgList) {
                    System.out.println(new String(msg.getBody()));
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        // 5.启动消费者consumer
        consumer.start();
    }
}

二、消费模式

1.负载均衡模式（默认）：消费者共同消费

MessageModel.CLUSTERING

发送10条消息

消费者1：消费了3条

消费者2：消费了5条

消费者3：消费了2条?

2.广播模式：每个消费者都消费同样的消息

MessageModel.BROADCASTING

package com.mq.rocket.consumer;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.common.protocol.heartbeat.MessageModel;

import java.util.List;

/**
 * 消息接收者
 */
public class Consumer {
    public static void main(String[] args) throws MQClientException {
        // 1.创建消费者consumer，指定消费者组名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group1");
        // 2.指定Nameserver地址
        consumer.setNamesrvAddr("127.0.0.1:9876");
        // 设置超时
        consumer.setConsumeTimeout(15000);
        // 3.订阅主题topic和tag
        consumer.subscribe("topic1", "tag1");
        // 设置消费模式：负载均衡和广播模式,默认负载均衡模式-MessageModel.CLUSTERING ,广播模式-MessageModel.BROADCASTING
        consumer.setMessageModel(MessageModel.BROADCASTING);

        // 4.设置回调函数,处理消息
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            // 接收消息内容
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgList, ConsumeConcurrentlyContext consumeConcurrentlyContext) {
                for (MessageExt msg:msgList) {
                    System.out.println(new String(msg.getBody()));
                }
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });
        // 5.启动消费者consumer
        consumer.start();
    }
}