On Thu, 29 Mar 2001, Mark Galbreath wrote:
> You could do it if the servlet sent the client an applet. Then, if
> you override the public void stop() method of java.applet.Applet,
> the method will be called by the browser or applet viewer to inform
> this applet that it should stop its execution. It is called when the
> Web page that contains this applet has been replaced by another
> page, and also just before the applet is to be destroyed (e.g., the
> browser closes). Just have the method call the servlet and inform
> it that the applet is about to be destroyed. In fact, a subclass of
> java.applet.Applet should override public void stop() if it has any
> operation that it wants to perform each time the Web page containing
> it is no longer visible.
This may get you better coverage, but it still won't get you to 100%.
What if someone has Java disabled, what if there are network problems,
what if the client browser crashes, etc. (And is invalidating the
session really what you want to do when they simply move to another
page?)
Again, you are inevitably going to have to rely on a timeout facility.
Whether doing what you suggest above is worth it will depend on the
exact goals/requirements of the particular project.
> ----- Original Message -----
> From: "Milt Epstein" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, March 29, 2001 8:29 AM
> Subject: Re: CLIENT CLOSED/TERMINATED and more...
>
>
> > On Thu, 29 Mar 2001, kal inuganti wrote:
> >
> > > Dear List Members,
> > >
> > > I am back with a basic question. It would be helpful if someone
> > > could tell me how my server can detect if the client is disconnected
> > > (what I mean by disconnected is - if the client closes the window)?
> > > If the client is disconnected I want to invalidate a session.
> >
> > Basically, you can't do it with 100% reliability, so you're going to
> > need to fall back on using a timeout.
> >
> >
> > > And one more thing... If the client opens the same page in a new
> > > window (^N in the same browser) I want the request to be redirected
> > > so that a different session can be created. It would be helpful if
> > > some pseudo code or directions can be given in this connection.
> >
> > Not sure you can do this, you may only be able to have one such
> > session at a time.
> >
>
Milt Epstein
Research Programmer
Software/Systems Development Group
Computing and Communications Services Office (CCSO)
University of Illinois at Urbana-Champaign (UIUC)
[EMAIL PROTECTED]
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