segmenfault的消息推送后台是咋做的？我知道前台肯定AJAX-PHP Tutorial-php.cn

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segmenfault的消息推送后台是咋做的？我知道前台肯定AJAX

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Jun 06, 2016 pm 08:43 PM

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首先我想知道比如说这个离线消息，是存在mysql里面的还是nosql数据库里面的呢？
然后我就想知道他的更新策略。
比如是客户端一上线的时候，是客户端到服务器取数据还是服务器判断用户是否上线。一旦上线就推送消息到客户端呢？

然后这些已读消息是不是读过了就从数据库删掉了？是读完了就删掉了还是比如做一个定时任务，比如每天凌晨4点统一删掉已读消息？
这个消息发送模块是一个异步的吗？但是我看见好多消息提醒的开源程序都是同步的。（没有什么异步框架之类的东西，比如wecenter，好像都用的是php，php本身不能异步，这个发消息到底是异步的还是同步的》求解惑！
因为我这一块也是不懂，说起来也是醉了。
大神解惑！

回复内容：

消息可以存在MySQL里面，但是未读的消息序列可以存在NoSQL里面，SF应该是存Redis里面了。
没有那么复杂的思路，就是普通的轮训，上线就从服务器上抓，而不是服务器向客户端推。
不是，因为你可以从消息中查看到已读消息的。不过SF会清除老数据，也就是说一个账户最多能存300条消息似乎，更早的就会被删掉。删除个消息分分钟的事情而已，我个人感觉没必要用队列。
因为是轮询，不是推送，所以你这里谈同步异步似乎没什么意义。如果看你举的例子的话，SF应该是一样的。

最后感觉你把推送和轮询搞混掉了，推送是服务器主动往客户端推消息，轮询是客户端请求服务器然后服务器返回消息。这两个机制是不一样的。如果是推送的话，必然是搞个消息队列让服务器一个一个推比较爽咯。

他不是ajax,是websocket

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