Howdy,
You want to find out the number of active sessions (or active users) in
each app. So you write an HttpSessionListener which keeps a counter
that is incremented in every sessionCreated event and decremented in
every sessionDestroyed event. This is fairly simple and has been
covered many times on this list in the past.
Your case is slightly more complicates, because you want one object to
keep track of users in all web applications. Even though I think this
is a bad idea (it violates webapp self-containment principles), here's
how you would go about it.
You can't just use the listener approach above because there will be one
instance of the listener for each webapp. So you instead have a
singleton object which keeps the counter (either one total counter or
one counter per webapp, or both, depending on what you want to do).
Your listeners don't keep a count themselves: instead, they increment
and decrement the count in the singleton. The singleton is deployed in
$CATALINA_HOME/common/lib or $CATALINA_HOME/shared/lib, so that all
applications can access it.
Yoav Shapira
Millennium ChemInformatics
-Original Message-
From: Kumar, Sumit [mailto:[EMAIL PROTECTED]
Sent: Tuesday, November 25, 2003 3:09 PM
To: 'Tomcat Users List'
Subject: RE: sharing sessions across multiple webapps
Didn't get you. Can you explain it a little more for me.
Thanks
-sumit
-Original Message-
From: Shapira, Yoav [mailto:[EMAIL PROTECTED]
Sent: Tuesday, November 25, 2003 1:40 PM
To: Tomcat Users List
Subject: RE: sharing sessions across multiple webapps
Howdy,
Yes, write an HttpSessionListener which accesses a singleton whose code
is in common/lib.
Yoav Shapira
Millennium ChemInformatics
-Original Message-
From: Kumar, Sumit [mailto:[EMAIL PROTECTED]
Sent: Tuesday, November 25, 2003 2:16 PM
To: 'Tomcat Users List'
Subject: sharing sessions across multiple webapps
I have two webapps on my server.
I am using the same userInformation object in both the webapps that is
located in tomcat/common/classes. When a user is authenticated by any
webapp
it puts the userinformation object in session. I want to track number
of
active users for each application. My userinformation object is
implementing
the HttpSessionBindingListener. The problem is it shows the total
number of
users for both apps. Can I find out the number of active users for
each
app
and still use the code at one place.
thanks
-sumit
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