Re: Concurrent Users

 Having a clustered environment complicates things :-)

One solution I am looking at is to leverage existing log4j calls in our
code to send messages via a socket appender to a common console gui app.

One advantage is that the main servlet code doesn't have to change to
support the console which can therefore be developed and enhanced as a
independent side project.

Note also that as of v2.3 there is a new HttpSessionListener interface
with methods sessionCreated() and sessionDestroyed() which gives a more
direct indication than the bound/unbound methods of the
HttpSessionBindingListener interface.

Michael Rutherfurd

"A mailing list for discussion about Sun Microsystem's Java Servlet API
Technology." <[email protected]> wrote on 17/06/2004 04:19:15
AM:

> Thanks a lot Chris...But will it work in clustered environment where we
> can have 2 or more number of web containers. Is it possible to get the
> count in Clustered Environment?
>
> -----Original Message-----
> From: A mailing list for discussion about Sun Microsystem's Java Servlet
> API Technology. [mailto:[email protected]] On Behalf Of
> Chris Pratt
> Sent: Wednesday, June 16, 2004 9:23 PM
> To: [email protected]
> Subject: Re: Concurrent Users
>
> Two things to note.  Since there is no way to positively no when a user
> has left your site, there's no accurate way of knowing how many users
> are currently viewing your site.  With that said, if you want to count
> the number of outstanding users whose sessions have not timed out, make
> a User object that you store in the Session (or use your existing one)
> and have it implement the HttpSessionBindingListener interface.  Create
> a Class level variable (i.e. static) to hold the count which gets
> incremented on each call to valueBound() and decremented on each call to
> valueUnbound().
>   (*Chris*)
>
> Original Message -----------------------
> You can keep a class level variable. Increment that when the user joins
> in
> the session and decrement that when the session times out or when you
> invalidate the session.
>
>
> >From: Khalid Umar <[email protected]>
> >Reply-To: "A mailing list for discussion about Sun Microsystem's Java
> >         Servlet API Technology." <[email protected]>
> >To: [email protected]
> >Subject: Concurrent Users
> >Date: Wed, 16 Jun 2004 16:45:52 +0530
> >
> >Is there a way to find out the number of concurrent users logged into a
> >web application?
> >
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