怎么在代码层处理app客户端同个人同时并发多个请求?
怎么在代码层处理app客户端同个人同时并发多个请求?
有个分享统计的接口,有时候客户端同个人会并发多个请求过来,服务端做了集群,最先通过redis 做一个cache(uid+articleid)判断是否有,结果直接绕过.
有没有什么办法直接在代码逻辑里面判断到,然后直接返回,而不是要到mysql那里通过唯一索引什么的来解决.
谢谢~~~
回复内容：
怎么在代码层处理app客户端同个人同时并发多个请求?
有个分享统计的接口,有时候客户端同个人会并发多个请求过来,服务端做了集群,最先通过redis 做一个cache(uid+articleid)判断是否有,结果直接绕过.
有没有什么办法直接在代码逻辑里面判断到,然后直接返回,而不是要到mysql那里通过唯一索引什么的来解决.
谢谢~~~
记录这个人访问时间间隔，如果频率超出限定值，直接返回错误代码~~
同个人的请求也可以通过redis控制请求频率啊。redis中key:uid+operation 通过increment(原子操作) 拿锁限制。
你的需求是并发安全方面的，就是如果同时多个请求，每个请求都涉及到查询，判断，更新这样的三个步骤，由于多个线程同时进行前两部操作，而导致判断被绕过。
解决办法：
1.redis的watch，将查询到更新这三个步骤绑定到一起，其实直接使用redis的事务应该就可以了，无需使用watch，具体请实际测试
2.利用redis设计一个分布式锁，可参考官方给出的方案：http://www.oschina.net/translate/redis-distlock
3.利用队列，将同一个用户的请求放入同一个队列，依次进行处理
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