Would something as simple as this in your servelet's doService
method work for you?

        protected void doService(HttpServletRequest request,
                        HttpServletResponse response) throws IOException,
ServletException {
                Clock c = new Clock();
                HttpSession s = request.getSession();
                fCurrentSession.set(s);
                synchronized (s) {
                        super.doService(request, response);
                }
                String temp = "Total Render time = " + c;
                Log.info(temp);
        }

> -----Original Message-----
> From: Michael Prescott [mailto:[EMAIL PROTECTED]
> Sent: Friday, August 26, 2005 8:28 AM
> To: [email protected]
> Subject: Design issue: synchronizing across callbacks?
> 
> I have an application where certain screens can only be shown based on a
> user's state (in an underlying model).  State changes with every page
> request (merely viewing the page can mean you're in a new state).
> 
> Because users can double-click or click multiple links rapidly
> (effectively making concurrent, incompatible requests), I need to
> implement 'validity' checks correctly, redirecting requests for pages
> that shouldn't be shown.
> 
> I can check the model's state in validate(), but that isn't sufficient
> because a concurrent request to a different page might change the model
> state immediately after the validate() call but before.  I'm new enough
> to Tapestry that I'm not sure how I can synchronize access to my model
> at a scope that spans all of these callbacks.
> 
> What's the typical way of handling this sort of thing?
> 
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