RocketMQ 发送顺序消息样例

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。

顺序消费的原理解析,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。

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。

1. 顺序消息生产

package org.apache.rocketmq.example.order2;

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

/**
* Producer,发送顺序消息
*/
public class Producer {

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

       producer.setNamesrvAddr("127.0.0.1:9876");

       producer.start();

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

       // 订单列表
       List<OrderStep> orderList = new Producer().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 " + orderList.get(i);
           Message msg = new Message("TopicTest", tags[i % tags.length], "KEY" + i, body.getBytes());

           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();
   }

   /**
    * 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 + '\'' +
               '}';
       }
   }

   /**
    * 生成模拟订单数据
    */
   private 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("完成");
       orderList.add(orderDemo);

       return orderList;
   }
}
SendResult status:SEND_OK, queueId:1, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='创建'}
SendResult status:SEND_OK, queueId:0, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111065, desc='创建'}
SendResult status:SEND_OK, queueId:1, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='付款'}
SendResult status:SEND_OK, queueId:2, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103117235, desc='创建'}
SendResult status:SEND_OK, queueId:0, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111065, desc='付款'}
SendResult status:SEND_OK, queueId:2, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103117235, desc='付款'}
SendResult status:SEND_OK, queueId:0, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111065, desc='完成'}
SendResult status:SEND_OK, queueId:1, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='推送'}
SendResult status:SEND_OK, queueId:2, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103117235, desc='完成'}
SendResult status:SEND_OK, queueId:1, body:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='完成'}

2. 顺序消费消息

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.common.message.MessageExt;
import java.util.List;

package org.apache.rocketmq.example.order2;

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

/**
* 顺序消息消费,带事务方式(应用可控制Offset什么时候提交)
*/
public class ConsumerInOrder {

   public static void main(String[] args) throws Exception {
       DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name_3");
       consumer.setNamesrvAddr("127.0.0.1:9876");
       /**
        * 设置Consumer第一次启动是从队列头部开始消费还是队列尾部开始消费
* 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); consumer.subscribe("TopicTest", "TagA || TagC || TagD"); consumer.registerMessageListener(new MessageListenerOrderly() { Random random = new Random(); @Override public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs, ConsumeOrderlyContext context) { context.setAutoCommit(true); for (MessageExt msg : msgs) { // 可以看到每个queue有唯一的consume线程来消费, 订单对每个queue(分区)有序 System.out.println("consumeThread=" + Thread.currentThread().getName() + ",queueId=" + msg.getQueueId() + ", content:" + new String(msg.getBody())); } 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.println("Consumer Started."); } }
consumeThread=ConsumeMessageThread_20,queueId=0, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111065, desc='创建'}
consumeThread=ConsumeMessageThread_20,queueId=0, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111065, desc='付款'}
consumeThread=ConsumeMessageThread_20,queueId=0, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111065, desc='完成'}
consumeThread=ConsumeMessageThread_20,queueId=2, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103117235, desc='创建'}
consumeThread=ConsumeMessageThread_20,queueId=2, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103117235, desc='付款'}
consumeThread=ConsumeMessageThread_20,queueId=2, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103117235, desc='完成'}
consumeThread=ConsumeMessageThread_3,queueId=1, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='创建'}
consumeThread=ConsumeMessageThread_3,queueId=1, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='付款'}
consumeThread=ConsumeMessageThread_3,queueId=1, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='推送'}
consumeThread=ConsumeMessageThread_3,queueId=1, content:2020-11-16 14:28:26 Hello RocketMQ OrderStep{orderId=15103111039, desc='完成'}

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