如何找出多少个使用长轮询方法的在线用户？

Question

i need best way to find out how many people are online with long polling method.

why i need long polling method to acquire that?

i need to know how many person are online in my site.of course i can do this with some query and update it in my site by each page load but i think no way to use this method in chat room is there?

`lastvisit` >= DATE_SUB(now(), INTERVAL 5 MINUTE)

any solution for this?if i can acquire that with no server polling i do appreciate if you guide me to right direction

Answer 1

If you're using long polling, then the number of users will be the number of active connectons to the poll handler - ie the total number of connections less those for other URLs - which is trivial to extract from the output of mod_status, however you omitted to tell us what server you are using.

However, if it were me, I'd simply use a database bound session handler and count the current sessions from there (but it's equally possible to do this using file or memory bound session handlers).

Since changes in the numbers are likely to be small relative to the number of requests coming in, this could be collected based on a scheduled job or by comparing a random number against a threshold rather than collected on every request.