欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

RocketMQ-初体验RocketMQ(07)-使用API操作RocketMQ_顺序消息 ordermessage

程序员文章站 2022-03-23 12:57:56
...

RocketMQ-初体验RocketMQ(07)-使用API操作RocketMQ_顺序消息 ordermessage


顺序消息的概念

消息有序指的是可以按照消息的发送顺序来消费(FIFO)。

RocketMQ可以严格的保证消息有序,可以分为分区有序或者全局有序


顺序消费的原理

在默认的情况下消息发送会采取Round Robin轮询方式把消息发送到不同的queue(分区队列);

而消费消息的时候从多个queue上拉取消息,这种情况发送和消费是不能保证顺序。

但是如果控制发送的顺序消息只依次发送到同一个queue中,消费的时候只从这个queue上依次拉取,则就保证了顺序。

当发送和消费参与的queue只有一个,则是全局有序;如果多个queue参与,则为分区有序,即相对每个queue,消息都是有序的。


消费状态

 

package org.apache.rocketmq.client.consumer.listener;

public enum ConsumeOrderlyStatus {
    /**
     * Success consumption
     */
    SUCCESS,

    /**
     * Suspend current queue a moment
     * 不能跳过消息,等待一下
     */
    SUSPEND_CURRENT_QUEUE_A_MOMENT;
}


演示

下面用订单进行分区有序的示例。一个订单的顺序流程是:创建、付款、推送、完成。订单号相同的消息会被先后发送到同一个队列中,消费时,同一个OrderId获取到的肯定是同一个队列。

Producer

package com.artisan.rocketmq.order;

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.MessageQueueSelector;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.common.message.MessageQueue;
import org.apache.rocketmq.remoting.common.RemotingHelper;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * @author 小工匠
 * @version v1.0
 * @create 2019-11-10 16:38
 * @motto show me the code ,change the word
 * @blog https://artisan.blog.csdn.net/
 * @description
 **/

public class OrderedProducer {

    public static void main(String[] args) throws Exception {
        DefaultMQProducer producer = new DefaultMQProducer("ordered_group_name");

        producer.setNamesrvAddr("192.168.18.130:9876;192.168.18.131:9876");

        producer.start();

        String[] tags = new String[]{"TagA", "TagC", "TagD"};

        // 订单列表
        List<OrderStep> orderList = buildOrders();

        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateStr = sdf.format(date);
        for (int i = 0; i < 10; i++) {
            // 加个时间前缀
            String body = dateStr + " Hello RocketMQ "+ i + " " + orderList.get(i);
            Message msg = new Message("TopicTest", tags[i % tags.length], "KEY" + i,
                    body.getBytes(RemotingHelper.DEFAULT_CHARSET));

            SendResult sendResult = producer.send(msg, new MessageQueueSelector() {
                @Override
                public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
                    Long id = (Long) arg;  //根据订单id选择发送queue
                    long index = id % mqs.size();
                    return mqs.get((int) index);
                }
            }, orderList.get(i).getOrderId());//订单id

            System.out.println(String.format("SendResult status:%s, queueId:%d, body:%s",
                    sendResult.getSendStatus(),
                    sendResult.getMessageQueue().getQueueId(),
                    body));
        }

        producer.shutdown();
    }


    /**
     * 生成模拟订单数据
     */
    private static List<OrderStep> buildOrders() {
        List<OrderStep> orderList = new ArrayList<OrderStep>();

        OrderStep orderDemo = new OrderStep();
        orderDemo.setOrderId(15103111039L);
        orderDemo.setDesc("创建");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103111065L);
        orderDemo.setDesc("创建");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103111039L);
        orderDemo.setDesc("付款");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103117235L);
        orderDemo.setDesc("创建");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103111065L);
        orderDemo.setDesc("付款");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103117235L);
        orderDemo.setDesc("付款");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103111065L);
        orderDemo.setDesc("完成");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103111039L);
        orderDemo.setDesc("推送");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103117235L);
        orderDemo.setDesc("完成");
        orderList.add(orderDemo);

        orderDemo = new OrderStep();
        orderDemo.setOrderId(15103111039L);
        orderDemo.setDesc("购物车");
        orderList.add(orderDemo);

        return orderList;
    }

    /**
     * 订单的步骤
     */
    private static class OrderStep {
        private long orderId;
        private String desc;

        public long getOrderId() {
            return orderId;
        }

        public void setOrderId(long orderId) {
            this.orderId = orderId;
        }

        public String getDesc() {
            return desc;
        }

        public void setDesc(String desc) {
            this.desc = desc;
        }

        @Override
        public String toString() {
            return "OrderStep{" +
                    "orderId=" + orderId +
                    ", desc='" + desc + '\'' +
                    '}';
        }
    }
}

日志
RocketMQ-初体验RocketMQ(07)-使用API操作RocketMQ_顺序消息 ordermessage


Consumer

package com.artisan.rocketmq.order;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeOrderlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeOrderlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerOrderly;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.remoting.common.RemotingHelper;

import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
 * @author 小工匠
 * @version v1.0
 * @create 2019-11-10 16:38
 * @motto show me the code ,change the word
 * @blog https://artisan.blog.csdn.net/
 * @description
 **/

public class OrderedConsumer {
    public static void main(String[] args) throws Exception {
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("ordered_group_name");
        consumer.setNamesrvAddr("192.168.18.130:9876;192.168.18.131:9876");
        /**
         * 设置消费位置
         */
        consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);

        consumer.subscribe("TopicTest", "*");
        // 有序消费 MessageListenerOrderly
        consumer.registerMessageListener(new MessageListenerOrderly() {

            @Override
            public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs,
                                                       ConsumeOrderlyContext context) {
                context.setAutoCommit(true);
                Random random = new Random();
                for (MessageExt msg : msgs) {
                    // 可以看到每个queue有唯一的consume来消费, 订单对每个queue(分区)有序
                    try {
                        System.out.println("consumeThread=" + Thread.currentThread().getName()
                                + ", queueId=" + msg.getQueueId()
                                + ", content:" + new String(msg.getBody(),
                                RemotingHelper.DEFAULT_CHARSET));
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                }

                try {
                    //模拟业务逻辑处理中...
                    TimeUnit.SECONDS.sleep(random.nextInt(10));
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return ConsumeOrderlyStatus.SUCCESS;

            }
        });

        consumer.start();

        System.out.printf("Consumer Started.%n");
    }
}

运行日志
RocketMQ-初体验RocketMQ(07)-使用API操作RocketMQ_顺序消息 ordermessage


代码

请移步:https://github.com/yangshangwei/rocketmqMaster