users@glassfish.java.net

RE: Keeping a timer alive

From: Dru Devore <ddevore_at_duckhouse.us>
Date: Thu, 24 Jul 2008 13:15:04 -0700
Oh my...that was so much easier than I thought. With little work and it just works.

I am reading elsewhere that the timing in EJB 3 is still not implemented which, if I remember correctly, is why I didn't do it this way from the start. But if you use this example:
http://www.diotalevi.com/weblog/2006/10/30/java-ee-in-the-trenches-how-to-use-the-timerservice-and-write-a-timer-session-bean/
Everything for what I need is right there.

One last question though. If something goes horribly wrong with an execution of the task and it dies, runtime exception or something, am I right in saying that it will pickup with the next one? (I am going to be testing it if you don't know for sure)

Thanks for the suggestion.



-------- Original Message --------
Subject: RE: Keeping a timer alive
From: "Manfred Riem" <mriem@manorrock.org>
Date: Thu, July 24, 2008 12:48 pm
To: <users@glassfish.dev.java.net>

Hi Dru,
 
While it might seem to be a lot of overhead it is J2EE standard. Spawning a thread
in a servlet is not. The question is if you want to deal with race conditions that are
associated with threading.
 
Manfred
 
From: Dru Devore [mailto:ddevore@duckhouse.us]
Sent: Thursday, July 24, 2008 10:31 AM
To: users@glassfish.dev.java.net
Subject: RE: Keeping a timer alive
 
I am sure I can make this work though all I really need is a a timer that kicks off a method every X seconds and is managed by someone. Using the servlet I simply had a thread that would sleep for X seconds but I didn't have any management, which could be done if I need to.

Looking at the EJB timer service it looks like a lot of overhead and work to do a run this every X seconds. Is there a solution I am missing or do I need to create a monitor thread for my run every x seconds thread?




-------- Original Message --------
Subject: RE: Keeping a timer alive
From: "Manfred Riem" <mriem@manorrock.org>
Date: Thu, July 24, 2008 10:25 am
To: <users@glassfish.dev.java.net>

The following URLs come to mind:
 
 
Hope this helps,
Manfred
 
From: Dru Devore [mailto:ddevore@duckhouse.us]
Sent: Thursday, July 24, 2008 8:18 AM
To: users@glassfish.dev.java.net
Subject: RE: Keeping a timer alive
 
When it was written I am sure there was but I can't think of any presently.

I am looking for examples/tutorials do you have any good ones?




-------- Original Message --------
Subject: RE: Keeping a timer alive
From: "Manfred Riem" <mriem@manorrock.org>
Date: Thu, July 24, 2008 9:55 am
To: <users@glassfish.dev.java.net>

Any reason why you are not EJB timer service?
 
From: Dru Devore [mailto:ddevore@duckhouse.us]
Sent: Thursday, July 24, 2008 7:52 AM
To: glassfish_user
Subject: Keeping a timer alive
 

I have a timer that is running in a servlet in Glassfish and I encountered a problem with it last night, the timer thread stopped. I need a way to ensure the timer is running and if it does stop, to restart it. Is there a way to have the server monitor this or am I hoping for too much?

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