@Override

public Result seckillVoucher(Long voucherId) {

    //1.判断优惠券ID是否存在

    SeckillVoucher seckillVoucher = iSeckillVoucherService.getById(voucherId);

    //2.不存在，返回异常

    if(seckillVoucher == null){

        return Result.fail("优惠券不存在");

    }

    //3.存在，判断秒杀是否开始

    if(seckillVoucher.getBeginTime().isAfter(LocalDateTime.now())){

        return Result.fail("秒杀未开始");

    }

    //4.存在，判断秒杀是否结束

    if(seckillVoucher.getEndTime().isBefore(LocalDateTime.now())){

        return Result.fail("秒杀已结束");

    }

    //5.库存为空，返回异常

    if(seckillVoucher.getStock() < 1){

        return Result.fail("库存不足");

    }

    Long userId = UserHolder.getUser().getId();
    /*----------这里调用-------------*/

    synchronized (userId.toString().intern()){

        return createVoucherOrder(voucherId);

    }
    /*----------用这种-------------*/

    synchronized (userId.toString().intern()){

        return ((IVoucherOrderService)AopContext.currentProxy()).createVouch

    }

}

@Transactional

public Result createVoucherOrder(Long voucherId){

    //判断用户是否已经有优惠券

    QueryWrapper<VoucherOrder> queryWrapper = new QueryWrapper<>();

    queryWrapper.eq("user_id",UserHolder.getUser().getId());

    queryWrapper.eq("voucher_id",voucherId);

    int record = this.count();

    if(record > 0){

        return Result.fail("this user have voucher");

    }

    //6.库存不为空，新增数据，减库存

    boolean success = iSeckillVoucherService.update()

            .setSql("stock = stock - 1")

            .eq("voucher_id", voucherId)

            .gt("stock",0)

            .update();

    if(!success){

        return Result.fail("库存不足");

    }

    long orderId = redisWorker.nextId("order");

    VoucherOrder voucherOrder = new VoucherOrder();

    voucherOrder.setId(orderId);

    voucherOrder.setUserId(UserHolder.getUser().getId());

    voucherOrder.setVoucherId(voucherId);

    save(voucherOrder);

    //返回订单ID

    return Result.ok(orderId);

}