# RocketMQ 实战：模拟电商网站场景综合案例（九）

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RocketMQ 实战：模拟电商网站场景综合案例（九）

一、RocketMQ 实战：模拟电商网站场景综合案例-- 回退优惠券

1、回退优惠券


@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}",consumerGroup = "${mq.order.consumer.group.name}",messageModel = MessageModel.BROADCASTING )
public class CancelMQListener implements RocketMQListener<MessageExt>{

    @Autowired
    private TradeCouponMapper couponMapper;

    @Override
    public void onMessage(MessageExt message) {

        try {
            //1. 解析消息内容
            String body = new String(message.getBody(), "UTF-8");
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            log.info("接收到消息");
            //2. 查询优惠券信息
            TradeCoupon coupon = couponMapper.selectByPrimaryKey(mqEntity.getCouponId());
            //3.更改优惠券状态
            coupon.setUsedTime(null);
            coupon.setIsUsed(ShopCode.SHOP_COUPON_UNUSED.getCode());
            coupon.setOrderId(null);
            couponMapper.updateByPrimaryKey(coupon);
            log.info("回退优惠券成功");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            log.error("回退优惠券失败");
        }
    }
}

2、在 shop-coupon-service 工程模块中，完成 消费消息的 监听类 CancelMQListener.java 代码实现。


/**
 *   shop\shop-coupon-service\src\main\java\com\itheima\shop\mq\CancelMQListener.java
 *
 *   2024-6-11 创建 消费消息的 监听类 CancelMQListener.java
 */
package com.itheima.shop.mq;

import com.alibaba.fastjson.JSON;
import com.itheima.constant.ShopCode;
import com.itheima.entity.MQEntity;
import com.itheima.shop.mapper.TradeCouponMapper;
import com.itheima.shop.pojo.TradeCoupon;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.spring.annotation.MessageModel;
import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
import org.apache.rocketmq.spring.core.RocketMQListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.UnsupportedEncodingException;

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}", consumerGroup = "${mq.order.consumer.group.name}", messageModel = MessageModel.BROADCASTING)
public class CancelMQListener implements RocketMQListener<MessageExt> {

    @Autowired
    private TradeCouponMapper couponMapper;

    @Override
    public void onMessage(MessageExt message) {

        try {
            //1. 解析消息内容
            String body = new String(message.getBody(), "UTF-8");
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            log.info("接收到消息");
            if(mqEntity.getCouponId()!=null){
                //2. 查询优惠券信息
                TradeCoupon coupon = couponMapper.selectByPrimaryKey(mqEntity.getCouponId());
                //3.更改优惠券状态
                coupon.setUsedTime(null);
                coupon.setIsUsed(ShopCode.SHOP_COUPON_UNUSED.getCode());
                coupon.setOrderId(null);
                couponMapper.updateByPrimaryKey(coupon);
            }
            log.info("回退优惠券成功");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            log.error("回退优惠券失败");
        }
    }
}

二、RocketMQ 实战：模拟电商网站场景综合案例-- 回退用户余额

1、回退用户余额


@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}",consumerGroup = "${mq.order.consumer.group.name}",messageModel = MessageModel.BROADCASTING )
public class CancelMQListener implements RocketMQListener<MessageExt>{

    @Autowired
    private IUserService userService;

    @Override
    public void onMessage(MessageExt messageExt) {

        try {
            //1.解析消息
            String body = new String(messageExt.getBody(), "UTF-8");
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            log.info("接收到消息");
            if(mqEntity.getUserMoney()!=null && mqEntity.getUserMoney().compareTo(BigDecimal.ZERO)>0){
                //2.调用业务层,进行余额修改
                TradeUserMoneyLog userMoneyLog = new TradeUserMoneyLog();
                userMoneyLog.setUseMoney(mqEntity.getUserMoney());
                userMoneyLog.setMoneyLogType(ShopCode.SHOP_USER_MONEY_REFUND.getCode());
                userMoneyLog.setUserId(mqEntity.getUserId());
                userMoneyLog.setOrderId(mqEntity.getOrderId());
                userService.updateMoneyPaid(userMoneyLog);
                log.info("余额回退成功");
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            log.error("余额回退失败");
        }
    }
}

2、在 shop-user-service 工程模块中，完成 消费消息的 监听类 CancelMQListener.java 代码实现。


/**
 *   shop\shop-user-service\src\main\java\com\itheima\shop\mq\CancelMQListener.java
 *
 *   2024-6-11 创建 消费消息的 监听类 CancelMQListener.java
 */
package com.itheima.shop.mq;

import com.alibaba.fastjson.JSON;
import com.itheima.api.IUserService;
import com.itheima.constant.ShopCode;
import com.itheima.entity.MQEntity;
import com.itheima.shop.pojo.TradeUserMoneyLog;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.spring.annotation.MessageModel;
import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
import org.apache.rocketmq.spring.core.RocketMQListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}",consumerGroup = "${mq.order.consumer.group.name}",messageModel = MessageModel.BROADCASTING )
public class CancelMQListener implements RocketMQListener<MessageExt>{

    @Autowired
    private IUserService userService;

    @Override  //用户余额回退
    public void onMessage(MessageExt messageExt) {

        try {
            //1.解析消息
            String body = new String(messageExt.getBody(), "UTF-8");
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            log.info("接收到消息");
            if(mqEntity.getUserMoney()!=null && mqEntity.getUserMoney().compareTo(BigDecimal.ZERO)>0){
                //2.调用业务层,进行余额修改
                TradeUserMoneyLog userMoneyLog = new TradeUserMoneyLog();
                userMoneyLog.setUseMoney(mqEntity.getUserMoney());
                userMoneyLog.setMoneyLogType(ShopCode.SHOP_USER_MONEY_REFUND.getCode());
                userMoneyLog.setUserId(mqEntity.getUserId());
                userMoneyLog.setOrderId(mqEntity.getOrderId());
                userService.updateMoneyPaid(userMoneyLog);
                log.info("余额回退成功");
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            log.error("余额回退失败");
        }
    }
}

三、RocketMQ 实战：模拟电商网站场景综合案例-- 取消订单

1、取消订单


@Override
    public void onMessage(MessageExt messageExt) {
        String body = new String(messageExt.getBody(), "UTF-8");
        String msgId = messageExt.getMsgId();
        String tags = messageExt.getTags();
        String keys = messageExt.getKeys();
        log.info("CancelOrderProcessor receive message:"+messageExt);
        CancelOrderMQ cancelOrderMQ = JSON.parseObject(body, CancelOrderMQ.class);
        TradeOrder order = orderService.findOne(cancelOrderMQ.getOrderId());
		order.setOrderStatus(ShopCode.SHOP_ORDER_CANCEL.getCode());
        orderService.changeOrderStatus(order);
        log.info("订单:["+order.getOrderId()+"]状态设置为取消");
        return order;
    }

2、在 shop-order-service 工程模块中，完成 消费消息的 监听类 CancelMQListener.java 代码实现。


/**
 *   shop\shop-order-service\src\main\java\com\itheima\shop\mq\CancelMQListener.java
 *
 *   2024-6-11 创建 消费消息的 监听类 CancelMQListener.java
 */
package com.itheima.shop.mq;

import com.alibaba.fastjson.JSON;
import com.itheima.constant.ShopCode;
import com.itheima.entity.MQEntity;
import com.itheima.shop.mapper.TradeOrderMapper;
import com.itheima.shop.pojo.TradeOrder;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.spring.annotation.MessageModel;
import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
import org.apache.rocketmq.spring.core.RocketMQListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.UnsupportedEncodingException;

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}",consumerGroup = "${mq.order.consumer.group.name}",messageModel = MessageModel.BROADCASTING )
public class CancelMQListener implements RocketMQListener<MessageExt>{

    @Autowired
    private TradeOrderMapper orderMapper;

    @Override  //取消订单
    public void onMessage(MessageExt messageExt) {

        try {
            //1. 解析消息内容
            String body = new String(messageExt.getBody(),"UTF-8");
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            log.info("接受消息成功");
            //2. 查询订单
            TradeOrder order = orderMapper.selectByPrimaryKey(mqEntity.getOrderId());
            //3.更新订单状态为取消
            order.setOrderStatus(ShopCode.SHOP_ORDER_CANCEL.getCode());
            orderMapper.updateByPrimaryKey(order);
            log.info("订单状态设置为取消");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            log.info("订单取消失败");
        }
    }
}

四、RocketMQ 实战：模拟电商网站场景综合案例-- 失败补偿机制测试

1 、测试流程

1）准备测试环境

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ShopOrderServiceApplication.class)
public class OrderTest {

    @Autowired
    private IOrderService orderService;
}
2）准备测试数据
  • 用户数据
  • 商品数据
  • 优惠券数据
3）测试下单成功流程

@Test    
public void add(){
    Long goodsId=XXXL;
    Long userId=XXXL;
    Long couponId=XXXL;

    TradeOrder order = new TradeOrder();
    order.setGoodsId(goodsId);
    order.setUserId(userId);
    order.setGoodsNumber(1);
    order.setAddress("北京");
    order.setGoodsPrice(new BigDecimal("5000"));
    order.setOrderAmount(new BigDecimal("5000"));
    order.setMoneyPaid(new BigDecimal("100"));
    order.setCouponId(couponId);
    order.setShippingFee(new BigDecimal(0));
    orderService.confirmOrder(order);
}

执行完毕后,查看数据库中用户的余额、优惠券数据，及订单的状态数据

4）测试下单失败流程

代码同上。

执行完毕后，查看用户的余额、优惠券数据是否发生更改，订单的状态是否为取消。

2、删除数据库中使用日志表 和 记录表 内容，即 删除以下数据表内容。

trade_goods_number_log
trade_mq_consumer_log
trade_order
trade_user_money_log

3、保证 数据库中，用户 商品 优惠券 数据。

trade_user 表中，有数据，如余额是 1000 。
trade_order 表中，无数据。
trade_conpon 表中，优惠券 状态为 0 可用，优惠券 20 。

4、在 shop-order-service 工程模块中，创建 测试类 OrderServiceTest.java


/**
 *   shop\shop-order-service\src\test\java\com\itheima\test\OrderServiceTest.java
 *
 *   2024-6-11 创建 测试类 OrderServiceTest.java
 */
package com.itheima.test;

import com.itheima.api.IOrderService;
import com.itheima.shop.OrderServiceApplication;
import com.itheima.shop.pojo.TradeOrder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.io.IOException;
import java.math.BigDecimal;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = OrderServiceApplication.class)
public class OrderServiceTest {

    @Autowired
    private IOrderService orderService;

    @Test
    public void confirmOrder() throws IOException {

        Long coupouId = 345988230098857984L;
        Long goodsId = 345959443973935104L;
        Long userId = 345963634385633280L;

        TradeOrder order = new TradeOrder();
        order.setGoodsId(goodsId);
        order.setUserId(userId);
        order.setCouponId(coupouId);
        order.setAddress("北京");
        order.setGoodsNumber(1);
        order.setGoodsPrice(new BigDecimal(1000));
        order.setShippingFee(BigDecimal.ZERO);
        order.setOrderAmount(new BigDecimal(1000));
        order.setMoneyPaid(new BigDecimal(100));
        orderService.confirmOrder(order);

        System.in.read();
    }
}

5、启动测试类，查看数据库变化 和 idea 日志输出。

# RocketMQ 实战：模拟电商网站场景综合案例（八）

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