RE: Help on Action implementing thread for checking user registration thru email?

[Daniel Perry]

I previously posted a message on how i did this as a struts plugin, so i've
reposted below.

To do what you require, instead of scheduling a job for each entry after
24hrs, i would include a timestamp in the database, then say every hour,
check for expired entries and delete them.

----------------------------
Nope, you dont need to start another process - i use a struts plugin to load
and initialise Quartz.  It will run in other threads, but this will all be
done for you behind the scenes.

The code for my struts plugin is below (if it's of any help).  Add the
following entry to the struts-config-default.xml in the plug-in section to
load it:

<plug-in className="com.netcase.pdp.service.SchedulerService"></plug-in>

It runs a "Job" every 30 mins.

This job takes the form:

public class RemoveOldProvisionalTrainingJob implements StatefulJob {
public void execute(JobExecutionContext arg0) throws JobExecutionException {
// code to do actual work here
}
}


Note that i'm implementing StatfulJob - this stops it running two of the
same job at the same time.

Daniel.


---------------------SchedulerService.java-------------------------
package com.netcase.pdp.service;

import java.util.Date;

import javax.servlet.ServletException;

import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.SimpleTrigger;

import
com.netcase.pdp.service.scheduledjobs.RemoveOldProvisionalTrainingJob;

/**
 * @author Daniel Perry
 *
 */
public class SchedulerService implements PlugIn {

        Scheduler sched;

        public void init(ActionServlet servlet, ModuleConfig moduleConf)
                        throws ServletException {
                System.out.println("Starting scheduler service...");

                SchedulerFactory schedFact = new org.quartz.impl.StdSchedulerFactory();
                try {
                        sched = schedFact.getScheduler();
                        sched.start();

                                JobDetail jobDetail = new JobDetail(
                                                "removeOldProvisionalTrainingJob",
                                                Scheduler.DEFAULT_GROUP,
                                                RemoveOldProvisionalTrainingJob.class);

                                // new trigger - repeat every 30 mins starting in 5 
mins time
                                // (delay for startup)
                                SimpleTrigger trigger = new 
SimpleTrigger("30MinTrigger",
                                                Scheduler.DEFAULT_GROUP, new Date(new 
Date().getTime()
                                                                + (5L* 60L * 1000L)), 
null,
                                                SimpleTrigger.REPEAT_INDEFINITELY, 30 
* 60L * 1000L);

                                sched.scheduleJob(jobDetail, trigger);


                } catch (SchedulerException ex) {
                        ex.printStackTrace();
                }

        }

        public void destroy() {
                try {
                        sched.shutdown();
                } catch (SchedulerException ex) {
                        ex.printStackTrace();
                }
                sched = null;
        }

}
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