Quartz Scheduler - SimpleTrigger Example
November 20, 2023
SimpleTrigger is instantiated using TriggerBuilder. Find the code snippet.
SimpleTrigger trigger = TriggerBuilder.newTrigger().withIdentity("greattrigger", "mygroup")
.startAt(new Date(Calendar.getInstance().getTimeInMillis()+ 3000))
.withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(2)
.withRepeatCount(5)).build();
TriggerBuilder provides different methods for its configuration.
1.
withIdentity() : This method is used to provide a unique identity to trigger. We pass trigger name and group name.
2.
startAt() : Using this method we set the time when trigger will start for the first time.
3.
withSchedule() : Here we provide a ScheduleBuilder. In our example we are using SimpleScheduleBuilder.
SimpleScheduleBuilder is instantiated using simpleSchedule() method. We can configure SimpleScheduleBuilder using its different method.
1.
withIntervalInSeconds() : Using this method, we specify the interval time in seconds for trigger execution.
2.
withRepeatCount() : Here we specify how many times the trigger will repeat. If we specify n, it means complete number of time of trigger execution is n+1.
Complete Example
Find the gradle file to resolve Quartz 2 Jar dependencies.build.gradle
apply plugin: 'java'
apply plugin: 'eclipse'
archivesBaseName = 'concretepage'
version = '1'
repositories {
mavenLocal()
mavenCentral()
}
dependencies {
compile 'org.quartz-scheduler:quartz:2.2.1'
}
jar {
manifest {
attributes 'Main-Class': 'com.concretepage.SimpleTriggerExample'
}
}
PrintDateJob.java
package com.concretepage.job;
import java.util.Date;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobKey;
public class PrintDateJob implements Job {
@Override
public void execute(JobExecutionContext context)
throws JobExecutionException {
JobKey jobKey = context.getJobDetail().getKey();
System.out.println(jobKey+": "+ new Date());
}
}
SimpleTriggerExample.java
package com.concretepage;
import java.util.Calendar;
import java.util.Date;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.SimpleTrigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import com.concretepage.job.PrintDateJob;
public class SimpleTriggerExample {
public static void main(String[] args) throws SchedulerException {
SchedulerFactory schedulerFactory = new StdSchedulerFactory();
Scheduler scheduler = schedulerFactory.getScheduler();
JobDetail jobDetail = JobBuilder.newJob(PrintDateJob.class).withIdentity("goodjob", "mygroup").build();
SimpleTrigger trigger = TriggerBuilder.newTrigger().withIdentity("greattrigger", "mygroup")
.startAt(new Date(Calendar.getInstance().getTimeInMillis()+ 3000))
.withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(2)
.withRepeatCount(5)).build();
scheduler.scheduleJob(jobDetail, trigger);
scheduler.start();
try {
//wait for 20 seconds to finish the job
Thread.sleep(20000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//shutdown scheduler gracefully
scheduler.shutdown(true);
}
}
mygroup.goodjob: Sat May 23 11:55:27 IST 2015 mygroup.goodjob: Sat May 23 11:55:29 IST 2015 mygroup.goodjob: Sat May 23 11:55:31 IST 2015 mygroup.goodjob: Sat May 23 11:55:33 IST 2015 mygroup.goodjob: Sat May 23 11:55:35 IST 2015 mygroup.goodjob: Sat May 23 11:55:37 IST 2015
