Re: HOW CAN I USE THREADS IN TOMCAT
Hello, Prince! You wrote to Tomcat Users List [EMAIL PROTECTED] on Sat, 1 Nov 2003 13:21:42 +0530: P Hi, P I need to send a mail automatically at 10 minutes interval. how can P i do this? how can i activate threads in tomcat? Tomcat is a Java application, there are no difference of using threads with Tomcat or without it. Simply expand Thread class, and run your thread. But don't forget to notify and kill your thread when Tomcat is shutting down. Here is a link that might help you. http://developer.java.sun.com/developer/codesamples/thrds.html --- Regards Ivan[a]yourmail.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: HOW CAN I USE THREADS IN TOMCAT
Hi, I have an instance of MyMailScheduler - mmsched in a ContextListener class for my webapp. mmsched spawns threads to do some work regarding sending emails. In my contextDestroy method I do : mmsched = null; I was under the impression that if tomcat was shutdown or the webapp was stopped my threads would be automatically killed since mmsched would be garbage collected. Am I understanding this right or do I need to do something else ? My webapp does two mail related tasks for two different sets of data. Both tasks are identical and therefore I spawn two threads. The two threads do not share any data structures. Also do I need to make the run() method synchronized ? Thanks. On Monday, November 3, 2003, at 08:45 PM, IvanLatysh wrote: Hello, Prince! You wrote to Tomcat Users List [EMAIL PROTECTED] on Sat, 1 Nov 2003 13:21:42 +0530: P Hi, P I need to send a mail automatically at 10 minutes interval. how can P i do this? how can i activate threads in tomcat? Tomcat is a Java application, there are no difference of using threads with Tomcat or without it. Simply expand Thread class, and run your thread. But don't forget to notify and kill your thread when Tomcat is shutting down. Here is a link that might help you. http://developer.java.sun.com/developer/codesamples/thrds.html --- Regards Ivan[a]yourmail.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: HOW CAN I USE THREADS IN TOMCAT
Hi, The problem is that stop / suspend are deprecated. The destroy() method has yet not been implemented ? What does one do then? I have a solution - Keep a reference to the instances of the threads spawned in a hashtable. In contextDestroy make all these references null . Will this solution work ? Thanks. On Monday, November 3, 2003, at 09:27 PM, Shapira, Yoav wrote: Howdy, I have an instance of MyMailScheduler - mmsched in a ContextListener class for my webapp. mmsched spawns threads to do some work regarding sending emails. In my contextDestroy method I do : mmsched = null; mmsched should have a close()/stop()/shutdown() method which stops its threads. You call this method, and then set mmsched to null. I was under the impression that if tomcat was shutdown or the webapp was stopped my threads would be automatically killed since mmsched would be garbage collected. Am I understanding this right or do I need to do something else ? The JVM can't stop non-daemon threads. Either make mmsched spawn daemon threads, or make the mmsched stop() method interrupt and stop all its threads. My webapp does two mail related tasks for two different sets of data. Both tasks are identical and therefore I spawn two threads. The two threads do not share any data structures. Also do I need to make the run() method synchronized ? You don't need to make the run() method synchronized. Yoav Shapira This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
HOW CAN I USE THREADS IN TOMCAT
Hi, I need to send a mail automatically at 10 minutes interval. how can i do this? how can i activate threads in tomcat? regards Prince - Original Message - From: Bill Barker [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Saturday, November 01, 2003 1:00 PM Subject: Re: Opinions The recent port of the 3.3 variable-substitution to Tomcat 5 may very well solve your problems here :). The ports are supposed to move to commons-digester, so should be available in 4.1.30 as well. Francois JEANMOUGIN [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Hu! It's in early developments or is it suitable for production ? It's ready for production. People are already using it in production with tomcat 5. Of course, I'm biased ;) Well, there is that beta flag in front of tomcat5 that tell me that your opinion is more than biased :). Of course, I saw a mail telling that the beta flag is related to specification instability (not code), anyway... It's a Developer, rather than Sysadmin, option. Chances are you won't need to worry about it as you'll use commons-daemon with tomcat, which already does the required jsvc invocation for you. Well, that does not help that much. I hope that there will be a configuration scheme that'll let easily define user/group/port and so on for the connectors. Just waiting for a sysadmin point of view :). Thanks, François. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: HOW CAN I USE THREADS IN TOMCAT
Use cron under unix and/or a java app that would use Javamail classes. Of course you can do it inside a servlet. - Original Message - From: Prince [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] Sent: Saturday, November 01, 2003 8:51 AM Subject: HOW CAN I USE THREADS IN TOMCAT Hi, I need to send a mail automatically at 10 minutes interval. how can i do this? how can i activate threads in tomcat? regards Prince - Original Message - From: Bill Barker [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Saturday, November 01, 2003 1:00 PM Subject: Re: Opinions The recent port of the 3.3 variable-substitution to Tomcat 5 may very well solve your problems here :). The ports are supposed to move to commons-digester, so should be available in 4.1.30 as well. Francois JEANMOUGIN [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Hu! It's in early developments or is it suitable for production ? It's ready for production. People are already using it in production with tomcat 5. Of course, I'm biased ;) Well, there is that beta flag in front of tomcat5 that tell me that your opinion is more than biased :). Of course, I saw a mail telling that the beta flag is related to specification instability (not code), anyway... It's a Developer, rather than Sysadmin, option. Chances are you won't need to worry about it as you'll use commons-daemon with tomcat, which already does the required jsvc invocation for you. Well, that does not help that much. I hope that there will be a configuration scheme that'll let easily define user/group/port and so on for the connectors. Just waiting for a sysadmin point of view :). Thanks, François. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: HOW CAN I USE THREADS IN TOMCAT
A servlet is just a Java class. You can do anything you can do with the
java language, including start threads. The following starts a thread
that runs some task every 10 minutes. The thread is started in the
servlet init method. I choose to set the thread to daemon mode, meaning
that when the main thread of execution shuts down the mailer thread will
automatically be killed. Otherwise you need to be sure to keep track of
it and be sure to signal it to shutdown in your Servlet.destroy method.
public class MyServlet extends HttpServlet
{
private static class MailerThread extends Thread
{
public void run ()
{
while (true)
{
// do something
synchronized (this)
{
wait (10*60*1000);
}
}
}
}
// the servlet init method
public void init ()
{
MailerThread thread = new MailerThread ();
thread.setDaemon (true);
thread.start ();
}
// ... doGet, etc. ...
}
-Erik
Eric C wrote:
Use cron under unix and/or a java app that would use Javamail classes.
Of course you can do it inside a servlet.
- Original Message -
From: Prince [EMAIL PROTECTED]
To: Tomcat Users List [EMAIL PROTECTED]
Sent: Saturday, November 01, 2003 8:51 AM
Subject: HOW CAN I USE THREADS IN TOMCAT
Hi,
I need to send a mail automatically at 10 minutes interval. how can i do
this? how can i activate threads in tomcat?
regards
Prince
- Original Message -
From: Bill Barker [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, November 01, 2003 1:00 PM
Subject: Re: Opinions
The recent port of the 3.3 variable-substitution to Tomcat 5 may very
well
solve your problems here :). The ports are supposed to move to
commons-digester, so should be available in 4.1.30 as well.
Francois JEANMOUGIN [EMAIL PROTECTED] wrote in
message
news:[EMAIL PROTECTED]
Hu! It's in early developments or is it suitable for production ?
It's ready for production. People are already using it in production
with tomcat 5. Of course, I'm biased ;)
Well, there is that beta flag in front of tomcat5 that tell me that your
opinion is more than biased :). Of course, I saw a mail telling that the
beta flag is related to specification instability (not code), anyway...
It's a Developer, rather than Sysadmin, option. Chances are you won't
need to worry about it as you'll use commons-daemon with tomcat, which
already does the required jsvc invocation for you.
Well, that does not help that much. I hope that there will be a
configuration scheme that'll let easily define user/group/port and so on
for
the connectors. Just waiting for a sysadmin point of view :).
Thanks,
François.
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
--
http://www.spectacle.ca/
The New Online Source for Live Music in Montreal
.::514.286.1699::.
RE: HOW CAN I USE THREADS IN TOMCAT
I would also add that unless you have a particular need to embed this in
a specific Servlet, it might make more sense to add this thread to a
context listener handler.
For example, if I wanted to send out email to 1000 people (not Spam, of
course! ;-) and I initiated this from within a Servlet, in this case I'd
add a thread to the Servlet and let the Servlet return while the email
was still going out. This assumes I handle any errors in some other way
than displaying the results on the page.
On the other hand, if I wanted to, perhaps, clean-up some temporary data
within a database every so often, and I wanted to include this
funcitonality within a Web app rather than in a separate application
that I run from the CL via Cron every now and then, I'd probably
implement this within a context listener handler so that the thread
starts up when the Web app starts up and continues utnil the Web app
shuts down.
Just a thought!
-Fred Whipple
iMagine Internet Services
-Original Message-
From: Erik Wright [mailto:[EMAIL PROTECTED]
Sent: Saturday, November 01, 2003 11:03 AM
To: Tomcat Users List
Subject: Re: HOW CAN I USE THREADS IN TOMCAT
A servlet is just a Java class. You can do anything you can
do with the
java language, including start threads. The following starts a thread
that runs some task every 10 minutes. The thread is started in the
servlet init method. I choose to set the thread to daemon
mode, meaning
that when the main thread of execution shuts down the mailer
thread will
automatically be killed. Otherwise you need to be sure to
keep track of
it and be sure to signal it to shutdown in your
Servlet.destroy method.
public class MyServlet extends HttpServlet
{
private static class MailerThread extends Thread
{
public void run ()
{
while (true)
{
// do something
synchronized (this)
{
wait (10*60*1000);
}
}
}
}
// the servlet init method
public void init ()
{
MailerThread thread = new MailerThread ();
thread.setDaemon (true);
thread.start ();
}
// ... doGet, etc. ...
}
-Erik
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
