工作中redis锁的问题记录

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受到公司刚大佬的影响,说了很多关于写总结的好处,于是我就试着写一写微笑



上次上线的新车2,版本,有这么一个问题,我们服务端给app提供了一个上传图片的接口,图片是接受参数是一个数组,意思是等图片上传完之后,统一将图片id给我们就好了,但是因为上传接货单的上限是50张图片,所有如果一次就将图片全部上传并调用我们接口的话,app那边反应将会很慢,所以最后定的方案就是上传一张接货单就调用我们一次接口。

我们服务这边,是第一次上传借货单的时候就去创建一张接货单审核单,一个物流单对应一个物流单审核单,意味着一次上传的图片都挂在接货单审核单下面,因为app那边是上传接货单的时候是上传一次就掉一次接口,所以这里存在高并发的问题,第一次的代码是这个样的。

 /**     * 批量上传接货单     *     * @param orderID     * @param detailBos     * @throws BusinessException     */    @Override    public void mutilCreateReceiveOrder(Integer orderID, List<FreshCarReceivingGoodsPhotoDetailBo> detailBos) throws BusinessException {        if (orderID == null || detailBos == null){            throw new BusinessException("订单ID或者接货单不能为空");        }        //创建一张接货单审核单        FreshCarReceivGoodsBo freshCarReceivGoodsBo = new FreshCarReceivGoodsBo();        freshCarReceivGoodsBo.setOrderID(orderID);        Integer recID = this.create(freshCarReceivGoodsBo);        //填充到接货单集合中        List<FreshCarReceivingGoodsPhotoDetailBo> list = new ArrayList<>();        for (FreshCarReceivingGoodsPhotoDetailBo bo: detailBos){            if (bo == null){                continue;            }            bo.setReceivGoodsID(recID);            bo.setIsDelete(false);            bo.setCreateTime(new Date());            list.add(bo);        }        freshCarReceivingGoodsPhotoDetailDomain.create(list);    }/**     * 创建收货审核单     *     * @param freshCarReceivGoodsBo     * @return     * @throws BusinessException     */    @Override    public Integer create(FreshCarReceivGoodsBo freshCarReceivGoodsBo) throws BusinessException {        if (freshCarReceivGoodsBo == null){            throw new BusinessException("收货审核单不能为空");        }        FreshCarReceivGoods freshCarReceivGoods = BeanUtil.convert(freshCarReceivGoodsBo,FreshCarReceivGoods.class);        Integer orderID = freshCarReceivGoods.getOrderID();        if (orderID == null ){            throw new BusinessException("订单ID不能为空");        }        //查询该订单下是否存在收货审核单        RedisLock lock = null;        try {            lock = redisUtil.initLock(RedisKeyConstant.getKey(RedisKeyConstant.Business.COMMON, RedisKeyConstant.Project.COMMON,                    orderID.toString())); //获取锁            if(lock.lock(1000)){                FreshCarReceivGoodsBo  bo = this.getByOrderID(orderID);                if (bo != null){                    if (bo.getCheckStatus().equals(ReceiveStatusEnums.ReceiveCheckStatusEnum.WAITCHECK) ||                            bo.getCheckStatus().equals(ReceiveStatusEnums.ReceiveCheckStatusEnum.SAVE)) {                        return bo.getID();                    }                    if (bo.getCheckStatus().equals(ReceiveStatusEnums.ReceiveCheckStatusEnum.PASS)){                        throw new BusinessException("该订单已存在审核通过的接货审核单,无法再创建");                    }                }                //初始状态为保存                freshCarReceivGoods.setCheckStatus(ReceiveStatusEnums.ReceiveCheckStatusEnum.SAVE.getValue());                freshCarReceivGoods.setCreateTime(new Date());                freshCarReceivGoods.setIsDelete(false);                //保存                return freshCarReceivGoodsService.save(freshCarReceivGoods);            }else{                throw new BusinessException("get lock fail");            }        } finally {            if (null != lock) {                lock.unlock();            }        }
这样写的话,发现后面还是会一次上传还是会创建两张相同时间的接货单审核单。

问题分析:

     这个代码的锁的范围只是在创建接货单审核单的地方,而且而且创建借货单审核单,和保存图片是在同一个domain里面,所以是在同一个事务下面,当两个线程同时进来的时候,一个线程被挡住,一个进程进去创建了审核单,但是这个时候事务并没有提交,等第二个线程进来的时候,根本在数据库里面查不到记录,所以又创建了一遍,所以后台才会出现有两个审核单的情况。

问题解决:

最后我们是这样解决的,我们将锁的范围扩大,将创建借货单审核单和保存接货单信息放在同一个锁里面,而且是在同一个事务下面,这个的缺点是相应时间会长,但是能避免创建两个接货单审核单的情况。

代码如下:

/**     * 批量上传接货单     *     * @param orderID     * @param detailBos     * @throws BusinessException     */    @Override    public void mutilCreateReceiveOrder(Integer orderID, List<FreshCarReceivingGoodsPhotoDetailBo> detailBos) throws BusinessException {        if (orderID == null || detailBos == null){            throw new BusinessException("订单ID或者接货单不能为空");        }        RedisLock lock = null;        try {        lock = redisUtil.initLock(RedisKeyConstant.getKey(RedisKeyConstant.Business.COMMON, RedisKeyConstant.Project.COMMON,        "freshCar_order_"+orderID.toString()));        if(lock.lock(2000)){            //创建一张接货单审核单            FreshCarReceivGoodsBo freshCarReceivGoodsBo = new FreshCarReceivGoodsBo();            freshCarReceivGoodsBo.setOrderID(orderID);            Integer recID = this.create(freshCarReceivGoodsBo);            //填充到接货单集合中            List<FreshCarReceivingGoodsPhotoDetailBo> list = new ArrayList<>();            for (FreshCarReceivingGoodsPhotoDetailBo bo: detailBos){                if (bo == null){                    continue;                }                bo.setReceivGoodsID(recID);                bo.setIsDelete(false);                bo.setCreateTime(new Date());                list.add(bo);            }            freshCarReceivingGoodsPhotoDetailDomain.create(list);        }else{            throw new BusinessException("get lock fail");        }        } finally {            if (null != lock) {                lock.unlock();            }        }    }

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