121 lines
4.7 KiB
Java
121 lines
4.7 KiB
Java
package com.hmdp.service.impl;
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import cn.hutool.db.handler.RsHandler;
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import com.hmdp.config.RedissonConfig;
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import com.hmdp.dto.Result;
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import com.hmdp.entity.SeckillVoucher;
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import com.hmdp.entity.Voucher;
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import com.hmdp.entity.VoucherOrder;
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import com.hmdp.mapper.VoucherOrderMapper;
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import com.hmdp.service.ISeckillVoucherService;
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import com.hmdp.service.IVoucherOrderService;
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import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
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import com.hmdp.service.IVoucherService;
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import com.hmdp.utils.RedisIdWorker;
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import com.hmdp.utils.SimpleRedisLock;
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import com.hmdp.utils.UserHolder;
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import org.redisson.api.RLock;
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import org.redisson.api.RedissonClient;
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import org.springframework.aop.framework.AopContext;
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import org.springframework.aop.framework.AopProxy;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.redis.core.StringRedisTemplate;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import javax.annotation.Resource;
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import java.time.LocalDateTime;
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/**
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* <p>
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* 服务实现类
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* </p>
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*
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* @author 虎哥
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* @since 2021-12-22
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*/
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@Service
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public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
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@Autowired
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private ISeckillVoucherService iSeckillVoucherService;
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@Autowired
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private RedisIdWorker redisIdWorker;
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@Resource
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private StringRedisTemplate stringRedisTemplate;
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@Resource
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private RedissonClient redissonClient;
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@Override
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public Result seckillVoucher(Long voucherId) {
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// 根据vorcherId查询优惠券
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SeckillVoucher seckillVoucher = iSeckillVoucherService.getById(voucherId);
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// 判断秒杀功能是否已经开始或结束
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if (seckillVoucher.getBeginTime().isAfter(LocalDateTime.now())) {
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return Result.fail("秒杀功能还未开始");
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} else if (seckillVoucher.getEndTime().isBefore(LocalDateTime.now())) {
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return Result.fail("秒杀功能已经结束");
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}
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// 判断库存是否充足
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if(seckillVoucher.getStock()<1){
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return Result.fail("库存不足");
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}
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Long userID = UserHolder.getUser().getId();
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// // 基于悲观锁，但是这个在集群环境下还是会导致线程不安全
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// synchronized(userID.toString().intern()) {
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// // 获取代理对象，才能让事务生效
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// IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
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// return proxy.creatVoucheOrder(voucherId);
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// }
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// 不再用自己实现的分布式锁了，因为它存在不可重入，不可重试，超时释放，主从一致的问题
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// SimpleRedisLock simpleRedisLock = new SimpleRedisLock("oreder:" + userID, stringRedisTemplate);
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// boolean isLock = simpleRedisLock.tryLock(1200L);
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// 利用redission 的分布式锁可以解决上述问题
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RLock lock = redissonClient.getLock("lock:oreder:" + userID);
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boolean isLock = lock.tryLock();
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if(!isLock){
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return Result.fail("请勿重复下单");
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}
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// 获取代理对象，才能让事务生效
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try {
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IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
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return proxy.creatVoucheOrder(voucherId);
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} finally {
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// 释放锁
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lock.unlock();
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}
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}
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@Transactional
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public Result creatVoucheOrder(Long voucherId) {
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Long userID = UserHolder.getUser().getId();
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// 判断当前用户是否已经抢过订单了
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Integer count = query().eq("user_id", userID).eq("voucher_id", voucherId).count();
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if(count>0){
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return Result.fail("您已经抢过该优惠券了");
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}
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// 扣减库存,乐观锁，CAS法
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// boolean succed = iSeckillVoucherService.update().setSql("stock = stock-1").
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// eq("voucher_id",voucherId).eq("stock",seckillVoucher.getStock()).update(); 这种情况会导致即使有很多余额也会说库存不足
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boolean succed = iSeckillVoucherService.update().setSql("stock = stock-1").
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eq("voucher_id",voucherId).gt("stock",0).update();
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if(!succed){
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System.out.println("失败");
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return Result.fail("库存不足");
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}
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// 创建一个新的voucherOrder订单
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VoucherOrder voucherOrder = new VoucherOrder();
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long orderId = redisIdWorker.nextId("order");
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voucherOrder.setId(orderId);
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voucherOrder.setUserId(userID);
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voucherOrder.setVoucherId(voucherId);
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save(voucherOrder);
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// 返回订单id
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return Result.ok(orderId);
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}
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}
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