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From Jignesh Patel <jpa...@bangtechnology.com>
Subject RE: detecting the shutdown of tomcat in a servlet
Date Sat, 31 Jul 2004 14:24:26 GMT
Hi Yoav,

According to your suggestion it is advisable not to use
ServletContextListener if we are using <load on startup> feature.
And we just need to create a separate servlet for destroying daemon
threads.

Please provide us your valuable thoughts.


-Jignesh

 

On Wed, 2004-07-28 at 08:57, Shapira, Yoav wrote:
> Hi,
> Excellent answer by Rodrigo Ruiz.  I wanted to correct one tiny part,
> and for Tomcat it's a theoretical correction only, but since this a
> common mistake and a blemish on an otherwise great post:
> 
> <load-on-startup> servlets are initialized on startup by the container.
> But that doesn't mean they are destroyed on shutdown like the
> ServletContextListener.  The container is free to destroy these servlets
> as it sees necessary, usually to preserve resources if they are not
> under load and other servlets are.  Therefore it's entirely possible and
> legal for a <load-on-startup> servlet to be initialized and destroyed
> numerous times while the webapp is NOT restarted.
> 
> Accordingly, take his advice and use a ServletContextListener.  That's
> what it's for ;)
> 
> Yoav Shapira
> Millennium Research Informatics
> 
> 
> >-----Original Message-----
> >From: Rodrigo Ruiz [mailto:rruiz@gridsystems.com]
> >Sent: Wednesday, July 28, 2004 6:21 AM
> >To: Tomcat Users List
> >Subject: Re: detecting the shutdown of tomcat in a servlet
> >
> >There is more than one way :-)
> >
> >- From within a servlet, add a shutdown hook with
> >Runtime.getRuntim().addShutdownHook()
> >- Create a ServletContextListener, and implement the clean stop of your
> >daemon in the listener contextDestroyed() method
> >- Create an initialization servlet, and implement the clean stop in its
> >destroy() method
> >
> >and probably a few more if you use specific Tomcat classes.
> >
> >I would not use the first option unless really necessary, as it seems
> to
> >me a too much "low level solution".
> >My favourite is the second option, as this is what
> >ServletContextListeners are for. You could start and stop the thread
> >from this listener.
> >
> >The second and third options will perform the thread stop when the
> >context or the container are shut down. This includes a context stop
> >from the admin webapp. Whether this is good or bad for your purposes
> >depends on the actions you need to perform. I suppose you do not want
> >your thread to keep running if you stop the webapp, because restarting
> >the webapp would lead to have two daemon threads :-)
> >
> >HTH,
> >Rodrigo Ruiz
> >
> >STOCKHOLM, Raymond wrote:
> >
> >>In my tomcat 4.1.30n, I have a webapp in which a deamon Thread
> (started
> >automatically)
> >>is scheduled to send automatic mails every morning.
> >>
> >>I would like to make a clean stop of my deamon when tomcat shutdowns.
> >>
> >>How can I detect that tomcat is shuting down ?
> >>
> >>
> >>Raymond Stockholm
> >>Aubay Luxembourg
> >>51, Rue de Strasbourg
> >>L-2561 LUXEMBOURG
> >>Tel : +352 29 92 50 31
> >>
> >>
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> >>
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