1. Exploring Quartz Scheduler http://quartz-scheduler.org
Orlando Java User Group
Zemian Deng

2. Agenda (1.5 hours) Introduction (5 mins) Scheduling Jobs (20 mins)
How job is stored and executed (15 mins)
Scheduler Deployment (20 mins)
Tips for working with quartz API (5 mins)
QA session (25 mins)

3. Introduction: What is Quartz
Fancier java.util.Timer
Unix CRON replacement
A rich API set to the scheduler
Job data persistence
Job executions control

4. Creating A Job Class
public class SimpleJob implements org.quartz.Job {
@Override
public void execute(JobExecutionContext ctx)
throws JobExecutionException {
System.out.println(“job is running”); }

5. Scheduling One Time Job
import org.quartz.JobDetail; import org.quartz.Scheduler; import org.quartz.SimpleTrigger; import org.quartz.impl.StdSchedulerFactory; public class QuartzExample { public static void main(String[] args) throws Exception { Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler(); JobDetail job = new JobDetail("job1", SimpleJob.class); SimpleTrigger trigger = new SimpleTrigger("job1"); scheduler.scheduleJob(job, trigger); scheduler.start(); Thread.sleep(3000L); }

6. More Scheduling Job Examples
One time job with startTime
Repeat job now
Repeat job with startTime
Repeat job forever
Cron job

7. Introduction: Quartz 2.0 vs 1.8
Released in March 2011
New API
Java DSL for creating jobs
Database schema changes

8. Job Storages In Memory Job Storage - RAMJobStore
JDBC Job Storage - JobStoreTX
Tx DataSource Job Storage - JobStoreCMT
Spring Tx DataSource Job Storage - LocalDataSourceJobStore

9. Quartz Scheduler Deployment
Standalone single JVM/Quartz scheduler
Server/Client based via RMI registry
Web Container single JVM/Quartz scheduler
Allow http client to interact with scheduler!
Clustering Quartz scheduler servers

10. Scheduler Tips #1 SimpleTrigger Total Run Count = RepeatCount - 1
You able to specify an end date regardless of repeatCount.
Trigger is NOT sensitive to Daylight Saving Time (DST).

11. Scheduler Tips #2 CronTrigger
Cron Expression has optional fields.
Finest field unit is in second.
Trigger is senstive to DST.
Day-Of-Week starts with 1=SUN
You are allow only one Nth day-of-week (‘#’).

12. Scheduler Tips #3
Tired of java.util.Calendar & java.util.Date? Use org.quartz.TriggerUtils or Apache commons-langs DateUtils

13. Scheduler Tips #4 Spring Quartz Scheduler
You can’t disable auto shutdown!
The dataSource can partake Spring Tx Manager Abstraction.
Job may have access to Spring App Context through the Scheduler’s Context space.

14. Scheduler Tips #5
When using RMI server mode, there is a bug that can crash your scheduler:

15. Questions?