Hello Dave,
There is 1 instance of ApplicationServlet, with newer releases of
tapestry there is less and less things I can think of doing in the
ApplicationServlet. You can extend from
org.apache.tapestry.ApplicationServlet and create your own (perfectly ok
to do). In ApplicationServlet, usually you would do some global
configuration settings, resource allocation, fork threads, etc..
Without knowing too much about the application you're trying to develop,
you could fork threads in your ApplicationServlet that would do your
background processing and just clean them up in destroy(). I would not
recommend getting your ApplicationServlet instance, but perhaps develop
separate logic that would get triggered via a UI. This logic would do
monitoring/control and return response to the user via a UI. If you
need some global object or perhaps one of the threads that got forked
upon ApplicationServlet startup, consider having a pool of threads that
have the same purpose that you can just grab at any point...
Hope this helps,
Dennis
Dave Rathnow wrote:
I'm new to Tapestry and have just started working with it. My background is
WebObjects so
most of my question will come from that perspective.
The application I'm developing will be doing some background processing with
the UI providing
monitoring and control functions. In WebObjects, we would use an single Application instance
that is created when the web application is first started. We would store the objects required to
access and control the back ground processing. This Application instance is then available in
in each request-response loop through a Session object, or through a global
static method.
Is this same model provided by the ApplicationServlet class in Tapestry? Is
there a single instance
of this object and if so, how can I get it? Is it common practice to subclass
this class and
then do all your own application specific logic in the derived class?
Thanks,
Dave.
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