Quartz 2 JobListener-Beispiel

Beispiel für Quartz 2 JobListener

In diesem Lernprogramm zeigen wir Ihnen, wie SieJobListener erstellen, um den Status laufender Jobs zu verfolgen, z. B. wenn der Job beendet ist.

P.S This example is tested with Quartz 2.1.5

1. Quartz Job

Job, drucke eine einfache Nachricht und wirf einJobExecutionException zum Testen.

Datei: HelloJob.java

package com.example.quartz;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

public class HelloJob implements Job
{
    public void execute(JobExecutionContext context)
    throws JobExecutionException {

        System.out.println("Hello Quartz! 123");

        //Throw exception for testing
        throw new JobExecutionException("Testing Exception");
    }

}

2. JobListener

Um einen JobListener zu erstellen, implementieren Sie einfach dieJobListener-Schnittstelle und überschreiben Sie alle Methoden der Schnittstelle.

Datei: HelloJobListener.java

package com.example.quartz.listener;

import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobListener;

public class HelloJobListener implements JobListener {

    public static final String LISTENER_NAME = "dummyJobListenerName";

    @Override
    public String getName() {
        return LISTENER_NAME; //must return a name
    }

    // Run this if job is about to be executed.
    @Override
    public void jobToBeExecuted(JobExecutionContext context) {

        String jobName = context.getJobDetail().getKey().toString();
        System.out.println("jobToBeExecuted");
        System.out.println("Job : " + jobName + " is going to start...");

    }

    // No idea when will run this?
    @Override
    public void jobExecutionVetoed(JobExecutionContext context) {
        System.out.println("jobExecutionVetoed");
    }

    //Run this after job has been executed
    @Override
    public void jobWasExecuted(JobExecutionContext context,
            JobExecutionException jobException) {
        System.out.println("jobWasExecuted");

        String jobName = context.getJobDetail().getKey().toString();
        System.out.println("Job : " + jobName + " is finished...");

        if (!jobException.getMessage().equals("")) {
            System.out.println("Exception thrown by: " + jobName
                + " Exception: " + jobException.getMessage());
        }

    }

}

Note
Keine Ahnung, was "jobExecutionVetoed" ist und wann es ausgelöst wird? Kommentieren Sie, wenn Sie das wissen, danke.

3. CronTrigger

Beispiel zum Anhängen von überHelloJobListener an den Scheduler und zum Überwachen des Auftragsstatus.

Datei: CronTriggerExample.java

package com.example.quartz;

import org.quartz.CronScheduleBuilder;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.Scheduler;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.matchers.KeyMatcher;

import com.example.quartz.listener.HelloJobListener;

public class CronTriggerExample {
    public static void main( String[] args ) throws Exception
    {

    JobKey jobKey = new JobKey("dummyJobName", "group1");
        JobDetail job = JobBuilder.newJob(HelloJob.class)
        .withIdentity(jobKey).build();

        Trigger trigger = TriggerBuilder
        .newTrigger()
        .withIdentity("dummyTriggerName", "group1")
        .withSchedule(
            CronScheduleBuilder.cronSchedule("0/5 * * * * ?"))
        .build();

        Scheduler scheduler = new StdSchedulerFactory().getScheduler();

        //Listener attached to jobKey
        scheduler.getListenerManager().addJobListener(
            new HelloJobListener(), KeyMatcher.keyEquals(jobKey)
        );

        //Listener attached to group named "group 1" only.
        //scheduler.getListenerManager().addJobListener(
        //  new HelloJobListener(), GroupMatcher.jobGroupEquals("group1")
        //);

        scheduler.start();
        scheduler.scheduleJob(job, trigger);

    }
}

Führen SieCronTriggerExample.java aus. Hier ist die Ausgabe.

jobToBeExecuted
Job : group1.dummyJobName is going to start...
Hello Quartz! 123
jobWasExecuted
Job : group1.dummyJobName is started and finished...
Exception thrown by: group1.dummyJobName Exception: Testing Exception

jobToBeExecuted
Job : group1.dummyJobName is going to start...
Hello Quartz! 123
jobWasExecuted
Job : group1.dummyJobName is started and finished...
Exception thrown by: group1.dummyJobName Exception: Testing Exception

Quellcode herunterladen

Laden Sie es herunter -Quartz2-JobListener-Example.zip (13 KB)

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