Quartz JobListener 任务监听器

Quartz  Scheduler 可以对Job(任务)建立一个监听器，分别对任务执行  《之前， 之后， 取消》 3个阶段进行监听。 

实现监听器需要实现JobListener接口，然后注册到Scheduler上就可以了。

一：首先写一个监听器实现类

package com.gary.operation.jobdemo.example1;

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

public class MyJobListener implements JobListener {

    @Override
    public String getName() {
        return "MyJobListener";
    }

    /**
     * (1)
     * 任务执行之前执行
     * Called by the Scheduler when a JobDetail is about to be executed (an associated Trigger has occurred).
     */
    @Override
    public void jobToBeExecuted(JobExecutionContext context) {
        System.out.println("MyJobListener.jobToBeExecuted()");
    }

    /**
     * (2)
     * 这个方法正常情况下不执行,但是如果当TriggerListener中的vetoJobExecution方法返回true时,那么执行这个方法.
     * 需要注意的是 如果方法(2)执行 那么(1),(3)这个俩个方法不会执行,因为任务被终止了嘛.
     * Called by the Scheduler when a JobDetail was about to be executed (an associated Trigger has occurred),
     * but a TriggerListener vetoed it's execution.
     */
    @Override
    public void jobExecutionVetoed(JobExecutionContext context) {
        System.out.println("MyJobListener.jobExecutionVetoed()");
    }

    /**
     * (3)
     * 任务执行完成后执行,jobException如果它不为空则说明任务在执行过程中出现了异常
     * Called by the Scheduler after a JobDetail has been executed, and be for the associated Trigger's triggered(xx) method has been called.
     */
    @Override
    public void jobWasExecuted(JobExecutionContext context,
            JobExecutionException jobException) {
        System.out.println("MyJobListener.jobWasExecuted()");
    }

}

二：将这个监听器注册到Scheduler

假设有一个任务的key是 job1与 group1

// define the job and tie it to our HelloJob class
        JobDetail job = newJob(HelloJob.class)
            .withIdentity("job1", "group1")
            .build();

全局注册,所有Job都会起作用
Registering A JobListener With The Scheduler To Listen To All Jobs
sched.getListenerManager().addJobListener(new MyJobListener());

指定具体的任务
Registering A JobListener With The Scheduler To Listen To A Specific Job
Matcher<JobKey> matcher = KeyMatcher.keyEquals(new JobKey("job1", "group1"));
sched.getListenerManager().addJobListener(new MyJobListener(), matcher);

指定一组任务
Registering A JobListener With The Scheduler To Listen To All Jobs In a Group
GroupMatcher<JobKey> matcher = GroupMatcher.jobGroupEquals("group1");
sched.getListenerManager().addJobListener(new MyJobListener(), matcher);

可以根据组的名字匹配开头和结尾或包含
GroupMatcher<JobKey> matcher = GroupMatcher.groupStartsWith("g");
GroupMatcher<JobKey> matcher = GroupMatcher.groupContains("g");
sched.getListenerManager().addJobListener(new MyJobListener(), matcher);