You can use Quartz (http://www.opensymphony.com/quartz/) for scheduling.
To be notified with the servlet loads, add a listener in your web.xml
file:
<listener>
<listener-class>com.foo.ApplicationListener</listener-class>
</listener>
Also, you probably want your application to startup on load in web.xml:
<servlet>
<servlet-name>YourName</servlet-name>
<servlet-class>org.apache.tapestry.ApplicationServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
In com.foo.ApplicationListener.java, add things like (and I'm
copying/pasting here, so expect parts will be left out and won't
compile, but it should be enough to get you going):
package com.foo;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.Trigger;
import org.quartz.impl.StdSchedulerFactory;
public class ApplicationListener implements ServletContextListener
{
// The Quartz standard scheduler for use in this application.
private static final SchedulerFactory schedulerFactory = new
StdSchedulerFactory();
// This method called when servlet starts up
public void contextInitialized(ServletContextEvent event)
{
try
{
JobDetail job = new JobDetail("jobName", "jobGroup",
NotificationJob.class);
Scheduler scheduler = schedulerFactory.getScheduler();
// Create hourly trigger, MON-FRI, from 8am until 11pm
Trigger trigger = new CronTrigger("triggerName", "groupName", "0 0
8-23 ? * MON-FRI");
// Schedule the job with the trigger
scheduler.scheduleJob(job, trigger);
// Scheduler will not execute jobs until it has been started
//(though they can be scheduled before start())
scheduler.start();
}
catch (ParseException exception)
{
exception.printStackTrace();
}
catch (SchedulerException exception)
{
exception.printStackTrace();
}
}
// This method called when servlet shutdown
public void contextDestroyed(ServletContextEvent event)
{
try
{
schedulerFactory.getScheduler().shutdown();
}
catch (SchedulerException exception)
{
exception.printStackTrace();
}
}
}
Quartz has several trigger types (hourly, etc). You'll also want a
1-shot that fires on load, it sounds like (check the docs for how to do
this -- fairly simple, but I'd have to look it up, too). Your
NotificationJob.java will look something like:
package com.foo;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
public class NotificationJob implements Job
{
public void execute(JobExecutionContext context) throws
JobExecutionException
{
// Do your stuff here
}
}
/dev/mrg
-----Original Message-----
From: Frank [mailto:[EMAIL PROTECTED]
Sent: Monday, January 30, 2006 9:45 AMimport
To: [email protected]
Subject: Schedule a task when servlet loads on server.
Hi,
How do I make a scheduled task, that starts when the servlet loads and
run
ex. every hour ?
Cheers
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