look for the listener element
HTH,
Jon
Patrick Herrera wrote:
Hi all,
I would like to implement a ServletContextListener, but I can't find an example of the tags I need to add to my web.xml file to register a class as a listener.
Can anyone point me in the direction of an example?
Thanks,
Patrick
-----Original Message-----
From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Tuesday, 28 October 2003 1:16 AM
To: Tomcat Users List
Subject: RE: modifying shutdown behaviour?
Howdy,
When the $CATALINA_HOME/bin/shutdown.sh script is called I would like
a
particular web application to release its resources cleanly and
perform
tidy
You could implement a ServletContextListener. The
contextDestroyed()
method
will be called when your application is about to be removed.
If you have a servlet which initializes resource for your context (like an InitServlet), you can simply implemnent the "destroy" method to release your resources.
This may be easier than writing a ServletContextListener, and has fewer moving parts.
I would strongly disagree ;) The container is free to destroy and reload any servlet, including load-on-startup servlets, at any time it deems such action necessary.
If you need something done on shutdown or startup or both, it's much
cleaner to write a listener for that purpose than a servlet, for
multiple reasons: - The footprint of a servlet in memory is bigger
- Another servlet adds to request mapping overhead, reducing performance
- Servlets are not supposed to be written only for init/destroy
functionality, ServletContextListeners are expressly designed for this
purpose
- It's a lot easier to mess up thread-safety in a servlet (which of
course may have multiple instances in memory) than in a listener
The moving parts claim you make -- I'm not sure I understand that. Mind elaborating? ;)
Yoav Shapira
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