scheduling using Quartz

[Shruti Kale]

Hi guys!

I want to run a cron job from my java applications using Quartz. The thing is I can not understand how to go about it. i have read their documentation and examples but they do not present a clear pciture as to how Quartz can be used to schedule jobs.

Can anyone give me step by step instructions about how to go about it. I know i am asking a tedious explanation but any help will be greatly appreciated.

thanks and regards
smriti

[Magnus Palm�r]

You need to:
1) Get a scheduler
2) One or more jobdetails (each jobdetail will be associated with a class that does the work (by implementing one of the job interfaces).
3) For each jobdetail you need a crontrigger.
4) Schedule the jobdetail with the crontrigger.

I don't have a good and clean example but I'll extract some code that I'm using that might give you some ideas.
(Code below is taken from a "when-I-have-time-over" project and is slightly modified since it is spread around in a couple of helper classes as of now)

_schedFact = new StdSchedulerFactory();
_scheduler = _schedFact.getScheduler();
// This can be done later 
_scheduler.start();
 
String jobdetailName = jobProps.getProperty(AIAConstants.QUARTZ_JOBD_NAME,cfgFiles[i]);
// from my properties file
//quartz.jobdetail.class=com.blabla.JobTestWorker
JobDetail jobDetail = new JobDetail(jobdetailName, jobProps.getProperty(AIAConstants.QUARTZ_JOBD_GROUP,Scheduler.DEFAULT_GROUP), Class.forName(jobProps.getProperty(AIAConstants.QUARTZ_JOBD_CLASS)));
 
String trigName = jobProps.getProperty(AIAConstants.QUARTZ_TRIGG_NAME);
String schedGroup = props.getProperty(AIAConstants.QUARTZ_TRIGG_GROUP, Scheduler.DEFAULT_GROUP);
String cronCfg=props.getProperty("quartz.trigger.interval");
 
//From my properties file
#"0 0/15 7-16 ? * MON-FRI" --> Fire every 15min starting at  07:14 am every Monday, Tuesday, Wednesday, Thursday and Friday 
//quartz.trigger.croncfg=0 * * ? * MON-FRI
Trigger trigger = new CronTrigger(trigName,schedGroup ,cronCfg);
 
_scheduler.scheduleJob(jobDetail, trigger);
 
 
// jobTestWorker
public class JobTestWorker implements InterruptableJob {
 
 
//this is the method needed to get implemented
public void execute(JobExecutionContext jec) throws JobExecutionException {
 
_jobData = jec.getJobDetail().getJobDataMap();
_props = (Properties)_jobData.get(AIAConstants.QUARTZ_JOB_PROPS);
 
 
public void interrupt() throws UnableToInterruptJobException {  

[ December 07, 2004: Message edited by: Magnus Palm�r ]

[Joseph Maddison]

I'm just starting to look into Quartz, myself, but the first hit under Google for "java quartz" is the following link: http://www.onjava.com/pub/a/onjava/2004/03/10/quartz.html. It appears to be a comprehensive discussion of Quartz with sample programs.

Hope this helps,
Joseph