优惠券微服务延迟消息消费-释放优惠券功能开发《上》

import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import net.xdclass.model.CouponRecordMessage;
import net.xdclass.service.CouponRecordService;
import org.checkerframework.checker.units.qual.A;
import org.redisson.api.RedissonClient;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.concurrent.locks.Lock;



@Slf4j
@Component
@RabbitListener(queues = "${mqconfig.coupon_release_queue}")
public class CouponMQListener {


    @Autowired
    private CouponRecordService couponRecordService;

    @Autowired
    private RedissonClient redissonClient;

    /**
     *
     * 重复消费-幂等性
     *
     * 消费失败，重新入队后最大重试次数：
     *  如果消费失败，不重新入队，可以记录日志，然后插到数据库人工排查
     *
     *  消费者这块还有啥问题，大家可以先想下，然后给出解决方案
     *
     * @param recordMessage
     * @param message
     * @param channel
     * @throws IOException
     */
    @RabbitHandler
    public void releaseCouponRecord(CouponRecordMessage recordMessage, Message message, Channel channel) throws IOException {

        log.info("监听到消息：releaseCouponRecord消息内容：{}", recordMessage);
        long msgTag = message.getMessageProperties().getDeliveryTag();

        boolean flag = couponRecordService.releaseCouponRecord(recordMessage);

        //防止同个解锁任务并发进入；如果是串行消费不用加锁；加锁有利也有弊，看项目业务逻辑而定
        //Lock lock = redissonClient.getLock("lock:coupon_record_release:"+recordMessage.getTaskId());
        //lock.lock();
        try {
            if (flag) {
                //确认消息消费成功
                channel.basicAck(msgTag, false);
            }else {
                log.error("释放优惠券失败 flag=false,{}",recordMessage);
                channel.basicReject(msgTag,true);
            }

        } catch (IOException e) {
            log.error("释放优惠券记录异常:{},msg:{}",e,recordMessage);
            channel.basicReject(msgTag,true);
        }
//        finally {
//            lock.unlock();
//        }


    }


}

import net.xdclass.utils.JsonData;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(name = "xdclass-order-service")

public interface ProductOrderFeignSerivce {


    /**
     * 查询订单状态
     * @param outTradeNo
     * @return
     */
    @GetMapping("/api/order/v1/query_state")
    JsonData queryProductOrderState(@RequestParam("out_trade_no")String outTradeNo);


}

    /**
     * 释放优惠券记录
     * @param recordMessage
     * @return
     */
    boolean releaseCouponRecord(CouponRecordMessage recordMessage);

    /**
     * 更新优惠券使用记录
     * @param couponRecordId
     * @param state
     */
    void updateState(@Param("couponRecordId") Long couponRecordId, @Param("state") String state);

 /**
     * 解锁优惠券记录
     * 1）查询task工作单是否存在
     * 2) 查询订单状态
     * @param recordMessage
     * @return
     */
    @Override
    @Transactional(rollbackFor = Exception.class,propagation = Propagation.REQUIRED)
    public boolean releaseCouponRecord(CouponRecordMessage recordMessage) {

        //查询下task是否存
        CouponTaskDO taskDO = couponTaskMapper.selectOne(new QueryWrapper<CouponTaskDO>().eq("id",recordMessage.getTaskId()));

        if(taskDO==null){
            log.warn("工作单不存在，消息:{}",recordMessage);
            return true;
        }

        //lock状态才处理
        if(taskDO.getLockState().equalsIgnoreCase(StockTaskStateEnum.LOCK.name())){

            //查询订单状态
            JsonData jsonData = orderFeignSerivce.queryProductOrderState(recordMessage.getOutTradeNo());
            if(jsonData.getCode()==0){
                //正常响应，判断订单状态
                String state = jsonData.getData().toString();
                if(ProductOrderStateEnum.NEW.name().equalsIgnoreCase(state)){
                    //状态是NEW新建状态，则返回给消息队，列重新投递
                    log.warn("订单状态是NEW,返回给消息队列，重新投递:{}",recordMessage);
                    return false;
                }

                //如果是已经支付
                if(ProductOrderStateEnum.PAY.name().equalsIgnoreCase(state)){
                    //如果已经支付，修改task状态为finish
                    taskDO.setLockState(StockTaskStateEnum.FINISH.name());
                    couponTaskMapper.update(taskDO,new QueryWrapper<CouponTaskDO>().eq("id",recordMessage.getTaskId()));
                    log.info("订单已经支付，修改库存锁定工作单FINISH状态:{}",recordMessage);
                    return true;
                }
            }

            //订单不存在，或者订单被取消，确认消息,修改task状态为CANCEL,恢复优惠券使用记录为NEW
            log.warn("订单不存在，或者订单被取消，确认消息,修改task状态为CANCEL,恢复优惠券使用记录为NEW,message:{}",recordMessage);
            taskDO.setLockState(StockTaskStateEnum.CANCEL.name());

            couponTaskMapper.update(taskDO,new QueryWrapper<CouponTaskDO>().eq("id",recordMessage.getTaskId()));
            //恢复优惠券记录是NEW状态
            couponRecordMapper.updateState(taskDO.getCouponRecordId(),CouponStateEnum.NEW.name());

            return true;
        }else {
            log.warn("工作单状态不是LOCK,state={},消息体={}",taskDO.getLockState(),recordMessage);
            return true;
        }
    }

    <!--更新优惠券状态-->
    <update id="updateState">

        update coupon_record set use_state = #{useState} where id = #{couponRecordId}

    </update>