[大数据]java 使用redis分布式锁解决商品超卖问题

@Override
    public String getGood(Long id) {
        redisLock.tryLock(id+"userLock", 30, 30, TimeUnit.SECONDS);
        Suser suserCache=redisCache.getCacheObject("suser:"+id);
        if(suserCache==null){
            Suser suser=suserMapper.selectById(id);
            redisCache.setCacheObject("suser:"+id,suser,300, TimeUnit.SECONDS);
        }
        Suser suser=redisCache.getCacheObject("suser:"+id);
        if(suser.getNum()<=0){
            redisLock.unlock(id+"userLock");
            return "商品数量不足";
        }
        suser.setNum(suser.getNum()-1);
        redisCache.setCacheObject("suser:"+id,suser,300, TimeUnit.SECONDS);
        suserMapper.updateById(suser);
        redisLock.unlock(id+"userLock");
        return "抢购成功";
    }