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From "Lawrence, Gabriel" <glawre...@ucsd.edu>
Subject RE: In memory session replication and session listeners?
Date Fri, 13 Jun 2003 15:52:41 GMT
Flip,

Got it. That's an easy, crafty way to do it. Will try it out and let you
know how it works. 

-gabe

-----Original Message-----
From: Filip Hanik [mailto:mail@filip.net] 
Sent: Thursday, June 12, 2003 9:19 PM
To: Tomcat Users List
Subject: RE: In memory session replication and session listeners?

The session listener is only notified on the machine the value actually
gets
set.
Session data doesn't get replicated using the
setAttribute/removeAttribute
methods, but pure serialization.

And for now, the clustering doesn't have a public API to send your own
data
through it.
one way you an do it, is to implement the java.io.Externilizable
interface,
and when the data gets
deserialized, then set the stuff in your global variable, just remember
to
only set it once.

do you see where I am going with this?

Filip

> -----Original Message-----
> From: Lawrence, Gabriel [mailto:glawrence@ucsd.edu]
> Sent: Thursday, June 12, 2003 4:18 PM
> To: Tomcat Users List
> Subject: In memory session replication and session listeners?
>
>
> I'm using the tomcat 4 clustering stuff found at:
>
> http://cvs.apache.org/~fhanik/index.html
>
> And I have one issue. I have a service that tracks some information
that
> is reported outside the users session. This is examined by a different
> client then the users client. I want to keep this global information
in
> sync across my loadbalanced servers, as I can't necessarily predict
> which server the this different client is going to hit.
>
> The way it works without clustering is that I have a session listener
> set up that gets notified whenever data is added to a users session.
> This then triggers a update to my global store as well. What I think
I'm
> seeing is that when session information is replicated to my other
> server, the fact that something was set isn't triggering a session
> listener call on the other server. Does that mesh with peoples
> understanding?
>
> Is there a way I can get it to?
>
> Thanks!
> -gabe
>
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