[Zope] Re: Connected users

[Tres Seaver]

Sean Hastings wrote:
> HTTP connections open - send a request - get a response - and close.
> users are only really "connected" during that brief period of time.
> 
> If you want to create some other definition of "connected", you could check
> for time since the last request and decide that any user who has made a
> request in the last X minutes is still "connected".
> 
> If you want to get really tricky, you could have your Zope pages return a
> document with frames, and have one of those frames contain an HTTP reload
> command which keeps hitting the sever ever X seconds to let you know that
> the browser is still open to your page. (The return to this request can even
> be used to generate pop up messages for "connected" users) But even this
> doesn't guarantee that your user is still there. He or she may have walked
> away from the computer, taken a cab to the airport, and gotten on a flight
> to Tonga. :-)

If you can tolerate the cost, you can also force your users to create 
sessions, and then track how many of those are active;  they eventually 
time out, giving you a rough idea how many users are online.

Tres.
-- 
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Tres Seaver                                tseaver at zope.com
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