如何在IM应用程序（如GTalk，Skype等）中管理在线用户
[英]How to manage online users in IM applications such as GTalk, Skype etc
问题描述
Do they keep an online user list in a database and update it with every login and logout event, and run queries for online friends? 
他们是否将在线用户列表保存在数据库中，并在每次登录和注销事件时进行更新，并为在线朋友运行查询？
What about scalability? 那么可伸缩性呢？
Are there better solutions? 有更好的解决方案吗？
1 个解决方案
解决方案1
0 2011-09-01 16:56:48
If you try to either store presence in a traditional database, or poll for changes to anything, you're going to have a tough time scaling your presence system. 如果您尝试将状态存储在传统数据库中，或者轮询任何内容的更改，那么将很难扩展您的状态系统。 Start with one of the open source XMPP servers , pull it apart, and see how it works. 从一台开源XMPP服务器开始 ，将其拆开，看看它是如何工作的。 Each one of them scales differently, but at least you'll understand more about where you need to start. 它们中的每一个都有不同的缩放比例，但是至少您会了解更多有关从何开始的知识。
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