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From Leon Rosenberg <rosenberg.l...@googlemail.com>
Subject Re: custom session manager
Date Thu, 06 Oct 2005 14:11:24 GMT
Sorry, aber how exactly does it solves the problem of having one
session per user? :-)



On 10/6/05, Tobias Meyer <tm@allocation.net> wrote:
> > -----Urspr√ľngliche Nachricht-----
> > Von: Leon Rosenberg [mailto:rosenberg.leon@googlemail.com]
> > Gesendet: Donnerstag, 6. Oktober 2005 11:20
> > An: Tomcat Users List
> > Betreff: Re: custom session manager
> >
> >
> > On 10/6/05, Tobias Meyer <tm@allocation.net> wrote:
> > >
> > > Or, cou could add a static hashmap to your Servlet (or a
> > bean if using JSPs)
> > > where you simply add the sessions with every request. You
> > would have to put
> > > an attribute implementing
> > javax.servlet.http.HttpSessionActivationListener
> > > in each session though, that removes the session from your
> > hashmap when the
> > > session is expired or you will end up with having many
> > invalid entries in
> > > your hashmap. (And I don't even know what happens if you
> > keep the references
> > > to those Session objects when they are recycled by tomcat)
> > > We do this to keep track of our sessions within the application.
> >
> > If you keep your sessions in a hashmap forever they will never be
> > freed by the garbage collector and you will end with an outofmemory
> > error one day.
>
> That's why I said you need one Attribute that implements the
> HttpSessionActivationListener, which, on second thought , was wrong - you
> need to implement HttpSessionBindingListener.
>
> The Method
>
> public void valueUnbound(HttpSessionBindingEvent event)
>
> will get called automatically when the session expires, and you can add code
> that removes the session from the hashmap.
>
>
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