Quartz2作業監聽 - tw511教學網

在本教學中，我們將展示/介紹如何建立一個JobListener，跟蹤執行工作狀態在作業完成等。

P.S 這個例子是Quartz 2.1.5

1. Quartz 作業

作業 - 用於列印一個簡單的資訊，並丟擲一個JobExecutionException進行測試。

File : HelloJob.java

package com.yiibai;
 
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! - by tw511.com");	
 
		//Throw exception for testing
		throw new JobExecutionException("Testing Exception");
	}
 
}

2. JobListener

建立一個JobListener，只是實現了JobListener介面，並覆蓋所有的介面的方法。

File : HelloJobListener.java

package com.yiibai.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());
		}
 
	}
 
}

注意：
不知道什麼是“jobExecutionVetoed”，並會在何時觸發？

3. CronTrigger

例如上面HelloJobListener連線到排程和監控作業的狀態。

File : CronTriggerExample.java

package com.yiibai.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.yiibai.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);
 
    }
}

執行CronTriggerExample.java, 這裡是輸出結果：

jobToBeExecuted
Job : group1.dummyJobName is going to start...
Hello Quartz! - by tw511.com
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! - by tw511.com
jobWasExecuted
Job : group1.dummyJobName is started and finished...
Exception thrown by: group1.dummyJobName Exception: Testing Exception

以下程式碼下載地址：http://pan.baidu.com/s/1pJ6xiwb