How Redis implements order expiration deletion

Foreword

The design order has expired, you cannot rely solely on Redis, you need a cover-up strategy

Code implementation:

import com.coolplay.trade.dto.req.CancelOrderReq;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections.CollectionUtils;
import org.springframework.data.redis.core.ZSetOperations;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Set;
import java.util.concurrent.TimeUnit;


@Service
@Slf4j
public class OrderRedisDelayQueueOperator extends AbstractOrderScheduleDelayQueue {
    @Resource(name = "redisTemplate")
    private ZSetOperations<String, String> orderRedis;

    /**
     * 预售、现货生成订单15分钟后未支付，需要取消订单
     */
    private static final String DELAY_QUEUE_NAME = "order";

    /**
     * 每1秒执行一次
     */
    @Override
    @Scheduled(cron = "0/1 * * * * ? ")
    public void orderEventProcess() {
        if (!redisLock.tryLock(this.getClass().getSimpleName(), TimeUnit.MILLISECONDS, 10, 100)) {
            return;
        }
        Set<String> dq = orderRedis.range(DELAY_QUEUE_NAME, 0L, Long.MAX_VALUE);
        if (CollectionUtils.isEmpty(dq)) {
            return;
        }
        for (String orderNo : dq) {
            Double xs = orderRedis.score(DELAY_QUEUE_NAME, orderNo);
            Double now = System.currentTimeMillis() * 1.0;
            if (xs <= now) {
                log.info("{} timed out", orderNo);
                super.threadPoolTaskExecutor.execute(() -> {
                    CancelOrderReq req = new CancelOrderReq();
                    req.setOrderNo(orderNo);
                    req.setCancelType(OrderActionEnum.TIME_OUT_CANCEL);
                    orderService.cancelOrder(req);
                });
            } else {
                //log.info("{} no time out", orderNo);
                //如果最小的都没有过期，剩余的则不用处理了
                break;
            }
        }
    }


    public void addToRedis(String orderNo, long delayTime) {
        orderRedis.add(DELAY_QUEUE_NAME, orderNo, delayTime * 1.0);

    }

    public void removeFromRedis(String orderNo) {

        orderRedis.remove(DELAY_QUEUE_NAME, orderNo);
    }
}

Back-up strategy

/**
     * 取消订单--10分钟--20分钟执行一次
     */
    @XxlJob("cancelOrder20Minutes")
    public void cancelOrderTenMinutes() {
        log.info("*****[开始：下单十分钟以后系统自动取消订单]*****");
        Date start = DateUtil.dateRoll(new Date(), Calendar.MINUTE,-20);
        Date end = new Date();
       List<ClOrder> clorderList =clOrderMapper.selectListAllOrdrWaiting(start,end);
       if(ObjectUtil.isNotEmpty(clorderList)){
           for(int i=0;i<clorderList.size();i++){
               ClOrder clOrder = clorderList.get(i);
               if(ObjectUtil.isNotEmpty(clOrder)){
                   Date orderTime = clOrder.getOrderTime();
                   long between = cn.hutool.core.date.DateUtil.between(orderTime, new Date(), DateUnit.MINUTE);
                   if(between>10){
                       ClOrder clOrderTemp = new ClOrder();
                       clOrderTemp.setOrderState("3");
                       clOrderTemp.setId(clOrder.getId());
                       clOrderTemp.setMemberId(clOrder.getMemberId());
                       String msg="您的订单已经取消，订单金额已发放至您的账户请查收~";
                       try {
                           boolean b = orderService.cancelOrder(clOrderTemp,msg);
                           if(!b){
                               log.info("[订单失效：定时任务兜底策略更新失败]**订单ID: {}",clOrderTemp.getId());
                           }
                           log.info("[Redis订单取消订单失效，定时任务兜底策略生效]");
                       }catch (Exception e){
                           log.info("[订单失效：定时任务兜底策略更新失败]**订单ID: {}",clOrderTemp.getId());
                           e.printStackTrace();
                       }


                   }
               }
           }
       }
        log.info("*****[结束：下单十分钟以后系统自动取消订单]*****");
    }

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