In Tapestry, individual page and component fields, marked with the @Perist
or @SessionState annotations, will be stored in the the HttpSession.
Tapestry generates a unique session attribute key that identifies the name
of the page, nested component id, and field name.
If any request, Ajax or otherwise, is received after the session has been
invalidated, Tapestry will simply proceed using default (typically, null)
values for such fields. In some cases, the page may wish to inject the
Request so as to query whether the session is invalidated ... though it may
be easier to see if the specific field is null when it is not expected to
be.
Lance's note about a thread local map is actually a more recent
optimization; once you have the basic infrastructure to intercept field
access so as to store and retrieve data from the HttpSession, you can do
the same trick to separate instances from their state.
On Tue, Jan 8, 2013 at 8:54 PM, Shaun Thompson
<stho...@gmail.com<javascript:_e({}, 'cvml', 'stho...@gmail.com');>
> wrote:
> I'm currently evaluating component based frameworks, as we are using
> Wicket, and one of the problems we encounter is Ajax interactions after the
> http session has expired.
>
> If a user clicks on a component that is Ajax enabled - the framework throws
> a PageExpiration exception.
>
> For most applications, we want the request to still continue.
>
> The HelloWorld example from Tapestry doesn't appear to experience this.
>
> My questions are
>
> - For persistent data on a page where is this serialized to?
> - Are all Ajax interactions safe in this manner, form buttons, links, etc
>
--
Howard M. Lewis Ship
Creator of Apache Tapestry
The source for Tapestry training, mentoring and support. Contact me to
learn how I can get you up and productive in Tapestry fast!
(971) 678-5210
http://howardlewisship.com
--
Howard M. Lewis Ship
Creator of Apache Tapestry
The source for Tapestry training, mentoring and support. Contact me to
learn how I can get you up and productive in Tapestry fast!
(971) 678-5210
http://howardlewisship.com
