On Fri Apr 18 15:29:16 CEST 2008 Christopher Schultz <[EMAIL PROTECTED]> wrote:
Ronald,
Ronald Klop wrote:
> But why does the client still have the same session after one node
> shuts down. The session doesn't live on one node. It lives as long as
> the cluster lives.
That's a good point.
> I understand the Session object in the JVM is destroyed, but one part of
> clustering (for me) is to replicate the Session object, so the
> 'browser-session' lives on.
Fair enough.
> There is no way for me to detect if the browser-session expires or if
> the Session object expires except by hacking around with ugly if
> statements and making the deployement more difficult and fragile.
>
> I think session.destroyed should only be called if the last node of the
> cluster shuts down. Or if the session expires by timeout.
Unfortunately, I was unable to find any detail in the servlet
specification, which means that implementors are free to do what they'd
like in these situations. On the other hand, it means that you might
have an opportunity to lobby the Tomcat folks to add a configuration
parameter (similar to expireSessionsOnShutdown) to achieve the behavior
you desire.
The problem is that sessionDestroyed can be used to support both
resource release (kind of like a "finally" for sessions) as well as
"logout" (in your case). For the former, it is very important for that
event to fire, even on a single node being taken out of service. For
others (such as yourself), it is inconvenient. It's hard to satisfy both
requirements.
The Tomcat folks seem to have erred on the side of inclusivity (always
send the event) because there are possibilities to work around it. If
the event were never sent, there's no way to handle resource release at all.
Optional configuration sounds like a good choice.
-chris
Thanks for the explanation. I would implement the resource release stuff in a
ContextListener or by ValueUnboundListeners, but that is another discussion.
My problem isn't that big in practice. Just the accounting of logouts is not
100% correct. I'll think about something genius to work around it. If I can't
think of anything I will try to lobby more.
Ronald.
