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From "Filip Hanik" <>
Subject RE: JDBC Session Manager.
Date Tue, 24 Jun 2003 22:14:57 GMT
just use session replication, it will take care of the problem of non sticky
load balancing


> -----Original Message-----
> From: Angus Mezick []
> Sent: Tuesday, June 24, 2003 2:01 PM
> To:
> Subject: JDBC Session Manager.
> This is NOT about the JDBC Session Store.
> Ok, now that is out of the way.  I am working in an environment with a
> cisco load balancer that is broken (or the sales rep lied).  I can NOT
> do sticky sessions reliably to save its life.  So I implemented a
> session manage in the iplanet server we were using to use a DB as a
> session store.  The only sessions in memory were the ones in use.  All
> sessions not associated with a currently processing request were stored
> in the DB.  This allowed us to have some VERY nice clustering
> functionality without having to deal with ANY stickyness.  On a request
> as session was either inserted or selected from the db.  Iplanet only
> called the update method once at the end of the processing of a
> servlet's service method in the NSServletRunner class. (when the request
> input stream is closed)  At this point the manager's update() class is
> called.  This is usually an empty class.
> I am wondering what the best way to implement the same functionality in
> tomcat would be.  My current though is to change
> core.ApplicationDispatcher.invoke() to have the session from the request
> call the manager's update method. (I see a whole lot more changes in
> there)  I would much rather have this event code be trapped by the
> manager and then call the update.  Anyone know how to go about this?
> Should I have sent this to the developer's list?
> support.fireInstanceEvent(InstanceEvent.AFTER_DISPATCH_EVENT,
>                                       servlet, request, response);
> Angus Mezick
> GuideStar - Philanthropic Research Inc.
> 427 Scotland St.
> Williamsburg, Virginia 23185
> PHONE: (757)299-4631 x35  FAX:(757)229-8912
> <>
> <>
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