Quartz使用(4)

1. 概述

Quartz的监听器用于当任务调度中你所关注事件发生时，能够及时获取这一事件的通知。类似于任务执行过程中的邮件、短信类的提醒。Quartz监听器主要有JobListener、TriggerListener、SchedulerListener三种，顾名思义，分别表示任务、触发器、调度器对应的监听器。三者的使用方法类似，在开始介绍三种监听器之前，需要明确两个概念：全局监听器与非全局监听器，二者的区别在于：全局监听器能够接收到所有的Job/Trigger的事件通知，而非全局监听器只能接收到在其上注册的Job或Trigger的事件，不在其上注册的Job或Trigger则不会进行监听。关于全局与非全局的监听器的使用，在本文中会做一介绍。

2. JobListener

任务调度过程中，与任务Job相关的事件包括：job开始要执行的提示; job执行完成的提示灯。其接口如下：

public interface JobListener {

    public String getName();

    public void jobToBeExecuted(JobExecutionContext context);

    public void jobExecutionVetoed(JobExecutionContext context);

    public void jobWasExecuted(JobExecutionContext context,
            JobExecutionException jobException);

}

 其中：

1) getName方法：用于获取该JobListener的名称。

2) jobToBeExecuted方法：Scheduler在JobDetail将要被执行时调用这个方法。

3) jobExecutionVetoed方法：Scheduler在JobDetail即将被执行，但又被TriggerListerner否决时会调用该方法

4) jobWasExecuted方法：Scheduler在JobDetail被执行之后调用这个方法

示例：

下面的代码展示了简单使用JobListener的使用，其中区别了全局监听器与非全局监听器的创建及使用方法。

1) 简单的HelloWordJob创建

package org.ws.quartz.test3;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HelloWorldJob implements Job{
    
    private static Logger logger = LoggerFactory.getLogger(HelloWorldJob.class);
    
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        logger.info("Hello World");
    }
}

2) 创建简单的JobListener

package org.ws.quartz.test3;

import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleJobListener implements JobListener{

    private static Logger logger = LoggerFactory.getLogger(SimpleJobListener.class);
    
    @Override
    public String getName() {
        String name = getClass().getSimpleName();
        logger.info(" listener name is:"+name);
        return name;
    }

    @Override
    public void jobToBeExecuted(JobExecutionContext context) {
        String jobName = context.getJobDetail().getKey().getName();
        logger.info(jobName + " is going to be executed");
    }

    @Override
    public void jobExecutionVetoed(JobExecutionContext context) {
        String jobName = context.getJobDetail().getKey().getName();
        logger.info(jobName + " was vetoed and not executed");
    }

    @Override
    public void jobWasExecuted(JobExecutionContext context, JobExecutionException jobException) {
        String jobName = context.getJobDetail().getKey().getName();
        logger.info(jobName + " was executed");

    }
}

3) 调度器的创建与执行

package org.ws.quartz.test3;

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.matchers.EverythingMatcher;
import org.quartz.impl.matchers.KeyMatcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleQuartzExample {
    
    private static Logger logger = LoggerFactory.getLogger(SimpleQuartzExample.class);
    
    public static void main(String[] args) throws SchedulerException, InterruptedException {
        
        SimpleQuartzExample exam = new SimpleQuartzExample();
        
        logger.info("init scheduler componets");
        
        // 创建调度器
        Scheduler scheduler = exam.createScheduler();
        
        // 创建两个任务及对应的触发器
        JobDetail jobDetail1 = exam.createJobDetail("HelloWord1_Job", "HelloWorld1_Group");
        Trigger trigger1 = exam.createTrigger("HelloWord1_Job", "HelloWorld1_Group");
        
        JobDetail jobDetail2 = exam.createJobDetail("HelloWord2_Job", "HelloWorld2_Group");
        Trigger trigger2 = exam.createTrigger("HelloWord2_Job", "HelloWorld2_Group");
        
        // 构建调度任务
        scheduler.scheduleJob(jobDetail1, trigger1);
        scheduler.scheduleJob(jobDetail2, trigger2);
        
        // 创建并注册一个全局的Job Listener
        scheduler.getListenerManager().addJobListener(new SimpleJobListener(), EverythingMatcher.allJobs());
        
        // 创建并注册一个指定任务的Job Listener
//        scheduler.getListenerManager().addJobListener(new SimpleJobListener(), KeyMatcher.keyEquals(JobKey.jobKey("HelloWorld1_Job", "HelloWorld1_Group")));
        
        logger.info("execute scheduler");
        // 开启调度器
        scheduler.start();
        
        Thread.sleep(20000);
        
        scheduler.shutdown();
        
        logger.info("shut down scheduler");
    }

    protected Scheduler createScheduler() throws SchedulerException{
        return StdSchedulerFactory.getDefaultScheduler(); 
    }
    
    protected JobDetail createJobDetail(String jobName, String jobGroup){
        return JobBuilder.newJob(HelloWorldJob.class)
                .withIdentity(jobName, jobGroup)
                .build();
    }
    
    protected Trigger createTrigger(String triggerName, String triggerGroup){
        return  TriggerBuilder.newTrigger()
                .withIdentity(triggerName, triggerGroup)
                .withSchedule(
                        SimpleScheduleBuilder.simpleSchedule()
                        .withIntervalInSeconds(10)
                        .repeatForever()
                        ).build();
    }
}

① 执行全局监听器的结果如下：

2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] init scheduler componets
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] execute scheduler
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job is going to be executed
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.HelloWorldJob1] Hello World
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job was executed
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord2_Job is going to be executed
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.HelloWorldJob1] Hello World
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:11 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord2_Job was executed
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job is going to be executed
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.HelloWorldJob1] Hello World
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job was executed
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord2_Job is going to be executed
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.HelloWorldJob1] Hello World
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:14:21 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord2_Job was executed

② 将代码中的注释去掉，并注释全区监听器的创建，执行非全局监听器结果如下：

2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] init scheduler componets
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] execute scheduler
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job is going to be executed
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:32:57 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job was executed
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job is going to be executed
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job was executed
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 17:33:07 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job is going to be executed
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.SimpleJobListener] HelloWord1_Job was executed
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.SimpleJobListener]  listener name is:SimpleJobListener
  2017-07-16 17:33:17 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] shut down scheduler
  

备注：

除了代码中将对应的job注册到监听器中的两种方法，也有如下几种其他方法：

1) 将同一任务组的任务注册到监听器中

scheduler.getListenerManager().addJobListener(new SimpleJobListener(), GroupMatcher.jobGroupEquals("HelloWorld2_Group"));

2) 将两个任务组的任务注册到监听器中

scheduler.getListenerManager().addJobListener(new SimpleJobListener(), OrMatcher.or(GroupMatcher.jobGroupEquals("HelloWorld1_Group"), GroupMatcher.jobGroupEquals("HelloWorld2_Group")));

3. TriggerListener

任务调度过程中，与触发器Trigger相关的事件包括：触发器触发、触发器未正常触发、触发器完成等。TriggerListener的接口如下：

public interface TriggerListener {

    public String getName();

    public void triggerFired(Trigger trigger, JobExecutionContext context);

    public boolean vetoJobExecution(Trigger trigger, JobExecutionContext context);

    public void triggerMisfired(Trigger trigger);

    public void triggerComplete(Trigger trigger, JobExecutionContext context,
            int triggerInstructionCode);
}

其中：

1) getName方法：用于获取触发器的名称

2) triggerFired方法：当与监听器相关联的Trigger被触发，Job上的execute()方法将被执行时，Scheduler就调用该方法。

3) vetoJobExecution方法：在 Trigger 触发后，Job 将要被执行时由 Scheduler 调用这个方法。TriggerListener 给了一个选择去否决 Job 的执行。假如这个方法返回 true，这个 Job 将不会为此次 Trigger 触发而得到执行。

4) triggerMisfired方法：Scheduler 调用这个方法是在 Trigger 错过触发时。你应该关注此方法中持续时间长的逻辑：在出现许多错过触发的 Trigger 时，长逻辑会导致骨牌效应。你应当保持这上方法尽量的小。

5) triggerComplete方法：Trigger 被触发并且完成了 Job 的执行时，Scheduler 调用这个方法。

 示例：

下面的例子简单展示了TriggerListener的使用，其中创建并注册TriggerListener与JobListener几乎类似。

1) HelloWorldJob类

package org.ws.quartz.test3;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HelloWorldJob implements Job{
    
    private static Logger logger = LoggerFactory.getLogger(HelloWorldJob.class);
    
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        logger.info("Hello World");
    }
}

2) SimpleTriggerListener

package org.ws.quartz.test3;

import org.quartz.JobExecutionContext;
import org.quartz.Trigger;
import org.quartz.Trigger.CompletedExecutionInstruction;
import org.quartz.TriggerListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleTriggerListener implements TriggerListener{
    
    private static Logger logger = LoggerFactory.getLogger(SimpleTriggerListener.class);
    
    private String name;
    
    public SimpleTriggerListener(String name) {
        this.name = name;
    }
    
    @Override
    public String getName() {
        return name;
    }

    @Override
    public void triggerFired(Trigger trigger, JobExecutionContext context) {
        String triggerName = trigger.getKey().getName();
        logger.info(triggerName + " was fired");
    }

    @Override
    public boolean vetoJobExecution(Trigger trigger, JobExecutionContext context) {
        String triggerName = trigger.getKey().getName();
        logger.info(triggerName + " was not vetoed");
        return false;
    }

    @Override
    public void triggerMisfired(Trigger trigger) {
        String triggerName = trigger.getKey().getName();
        logger.info(triggerName + " misfired");
    }

    @Override
    public void triggerComplete(Trigger trigger, JobExecutionContext context,
            CompletedExecutionInstruction triggerInstructionCode) {
        String triggerName = trigger.getKey().getName();
        logger.info(triggerName + " is complete");
    }
}

3) 任务调度与运行，涉及到多种TriggerListener的创建与注册。

package org.ws.quartz.test3;

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.TriggerKey;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.matchers.EverythingMatcher;
import org.quartz.impl.matchers.GroupMatcher;
import org.quartz.impl.matchers.KeyMatcher;
import org.quartz.impl.matchers.OrMatcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleQuartzExample {
    
    private static Logger logger = LoggerFactory.getLogger(SimpleQuartzExample.class);
    
    public static void main(String[] args) throws SchedulerException, InterruptedException {
        
        SimpleQuartzExample exam = new SimpleQuartzExample();
        
        logger.info("init scheduler componets");
        
        // 创建调度器
        Scheduler scheduler = exam.createScheduler();
        
        // 创建两个任务及对应的触发器
        JobDetail jobDetail1 = exam.createJobDetail("HelloWord1_Job", "HelloWorld1_Group");
        Trigger trigger1 = exam.createTrigger("HelloWord1_Job", "HelloWorld1_Group");
        
        JobDetail jobDetail2 = exam.createJobDetail("HelloWord2_Job", "HelloWorld2_Group");
        Trigger trigger2 = exam.createTrigger("HelloWord2_Job", "HelloWorld2_Group");
        
        // 构建调度任务
        scheduler.scheduleJob(jobDetail1, trigger1);
        scheduler.scheduleJob(jobDetail2, trigger2);
        
        // 创建并注册一个全局的Trigger Listener
        scheduler.getListenerManager().addTriggerListener(new SimpleTriggerListener("SimpleTrigger"), EverythingMatcher.allTriggers());
        
        // 创建并注册一个局部的Trigger Listener
//        scheduler.getListenerManager().addTriggerListener(new SimpleTriggerListener("SimpleTrigger"), KeyMatcher.keyEquals(TriggerKey.triggerKey("HelloWord1_Job", "HelloWorld1_Group")));
        
        // 创建并注册一个特定组的Trigger Listener
//        scheduler.getListenerManager().addTriggerListener(new SimpleTriggerListener("SimpleTrigger"), GroupMatcher.groupEquals("HelloWorld1_Group"));
        
        logger.info("execute scheduler");
        // 开启调度器""
        scheduler.start();
        
        Thread.sleep(20000);
        
        scheduler.shutdown();
        
        logger.info("shut down scheduler");
    }

    protected Scheduler createScheduler() throws SchedulerException{
        return StdSchedulerFactory.getDefaultScheduler(); 
    }
    
    protected JobDetail createJobDetail(String jobName, String jobGroup){
        return JobBuilder.newJob(HelloWorldJob.class)
                .withIdentity(jobName, jobGroup)
                .build();
    }
    
    protected Trigger createTrigger(String triggerName, String triggerGroup){
        return  TriggerBuilder.newTrigger()
                .withIdentity(triggerName, triggerGroup)
                .withSchedule(
                        SimpleScheduleBuilder.simpleSchedule()
                        .withIntervalInSeconds(10)
                        .repeatForever()
                        ).build();
    }
}

执行全局监听器的结果如下：

2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] init scheduler componets
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] execute scheduler
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job was fired
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job was not vetoed
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job is complete
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job was fired
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job was not vetoed
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 18:31:58 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job is complete
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job was fired
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job was not vetoed
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job is complete
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job was fired
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job was not vetoed
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 18:32:08 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job is complete
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job was fired
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job was not vetoed
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord1_Job is complete
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job was fired
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job was not vetoed
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.SimpleTriggerListener] HelloWord2_Job is complete
  2017-07-16 18:32:18 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] shut down scheduler
  

4. SchedulerListener

SchedulerListener会在Scheduler的生命周期中关键事件发生时被调用。与Scheduler有关的事件包括：增加一个job/trigger，删除一个job/trigger，scheduler发生严重错误，关闭scheduler等。

SchedulerListener的接口如下：

public interface SchedulerListener {

    public void jobScheduled(Trigger trigger);

    public void jobUnscheduled(String triggerName, String triggerGroup);

    public void triggerFinalized(Trigger trigger);

    public void triggersPaused(String triggerName, String triggerGroup);

    public void triggersResumed(String triggerName, String triggerGroup);

    public void jobsPaused(String jobName, String jobGroup);

    public void jobsResumed(String jobName, String jobGroup);

    public void schedulerError(String msg, SchedulerException cause);

    public void schedulerStarted();

    public void schedulerInStandbyMode();

    public void schedulerShutdown();

    public void schedulingDataCleared();
}

其中：

1) jobScheduled方法：用于部署JobDetail时调用

2) jobUnscheduled方法：用于卸载JobDetail时调用

3) triggerFinalized方法：当一个 Trigger 来到了再也不会触发的状态时调用这个方法。除非这个 Job 已设置成了持久性，否则它就会从 Scheduler 中移除。

4) triggersPaused方法：Scheduler 调用这个方法是发生在一个 Trigger 或 Trigger 组被暂停时。假如是 Trigger 组的话，triggerName 参数将为 null。

5) triggersResumed方法：Scheduler 调用这个方法是发生成一个 Trigger 或 Trigger 组从暂停中恢复时。假如是 Trigger 组的话，假如是 Trigger 组的话，triggerName 参数将为 null。参数将为 null。
6) jobsPaused方法：当一个或一组 JobDetail 暂停时调用这个方法。
7) jobsResumed方法：当一个或一组 Job 从暂停上恢复时调用这个方法。假如是一个 Job 组，jobName 参数将为 null。
8) schedulerError方法：在 Scheduler 的正常运行期间产生一个严重错误时调用这个方法。
9) schedulerStarted方法：当Scheduler 开启时，调用该方法
10) schedulerInStandbyMode方法： 当Scheduler处于StandBy模式时，调用该方法
11) schedulerShutdown方法：当Scheduler停止时，调用该方法
12) schedulingDataCleared方法：当Scheduler中的数据被清除时，调用该方法。

 示例：

下面的代码简单描述了如何使用SchedulerListener方法：

1) HelloWorldJob

package org.ws.quartz.test3;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HelloWorldJob implements Job{
    
    private static Logger logger = LoggerFactory.getLogger(HelloWorldJob.class);
    
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        logger.info("Hello World");
    }
}

2) 简单的SchedulerListener

package org.ws.quartz.test3;

import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.SchedulerException;
import org.quartz.SchedulerListener;
import org.quartz.Trigger;
import org.quartz.TriggerKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleSchedulerListener implements SchedulerListener{

    private static Logger logger = LoggerFactory.getLogger(SimpleSchedulerListener.class);
    
    @Override
    public void jobScheduled(Trigger trigger) {
        String jobName = trigger.getJobKey().getName();
        logger.info(jobName + " has been scheduled");
    }

    @Override
    public void jobUnscheduled(TriggerKey triggerKey) {
        logger.info(triggerKey + " is being unscheduled");
    }

    @Override
    public void triggerFinalized(Trigger trigger) {
        logger.info("Trigger is finished for " + trigger.getJobKey().getName());
    }

    @Override
    public void triggerPaused(TriggerKey triggerKey) {
        logger.info(triggerKey + " is being paused");
    }

    @Override
    public void triggersPaused(String triggerGroup) {
        logger.info("trigger group "+triggerGroup + " is being paused");
    }

    @Override
    public void triggerResumed(TriggerKey triggerKey) {
        logger.info(triggerKey + " is being resumed");
    }

    @Override
    public void triggersResumed(String triggerGroup) {
        logger.info("trigger group "+triggerGroup + " is being resumed");
    }

    @Override
    public void jobAdded(JobDetail jobDetail) {
        logger.info(jobDetail.getKey()+" is added");
    }

    @Override
    public void jobDeleted(JobKey jobKey) {
        logger.info(jobKey+" is deleted");
    }

    @Override
    public void jobPaused(JobKey jobKey) {
        logger.info(jobKey+" is paused");
    }

    @Override
    public void jobsPaused(String jobGroup) {
        logger.info("job group "+jobGroup+" is paused");
    }

    @Override
    public void jobResumed(JobKey jobKey) {
        logger.info(jobKey+" is resumed");
    }

    @Override
    public void jobsResumed(String jobGroup) {
        logger.info("job group "+jobGroup+" is resumed");
    }

    @Override
    public void schedulerError(String msg, SchedulerException cause) {
        logger.error(msg, cause.getUnderlyingException());
    }

    @Override
    public void schedulerInStandbyMode() {
        logger.info("scheduler is in standby mode");
    }

    @Override
    public void schedulerStarted() {
        logger.info("scheduler has been started");
    }

    @Override
    public void schedulerStarting() {
        logger.info("scheduler is being started");
    }

    @Override
    public void schedulerShutdown() {
        logger.info("scheduler has been shutdown");
    }

    @Override
    public void schedulerShuttingdown() {
        logger.info("scheduler is being shutdown");
    }

    @Override
    public void schedulingDataCleared() {
        logger.info("scheduler has cleared all data");
    }
}

3) 任务调度以及SchedulerListener的加载调用

package org.ws.quartz.test3;

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.TriggerKey;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.matchers.EverythingMatcher;
import org.quartz.impl.matchers.GroupMatcher;
import org.quartz.impl.matchers.KeyMatcher;
import org.quartz.impl.matchers.OrMatcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleQuartzExample {
    
    private static Logger logger = LoggerFactory.getLogger(SimpleQuartzExample.class);
    
    public static void main(String[] args) throws SchedulerException, InterruptedException {
        
        SimpleQuartzExample exam = new SimpleQuartzExample();
        
        logger.info("init scheduler componets");
        
        // 创建调度器
        Scheduler scheduler = exam.createScheduler();
        
        // 创建任务及对应的触发器
        JobDetail jobDetail = exam.createJobDetail("HelloWord_Job", "HelloWorld_Group");
        Trigger trigger = exam.createTrigger("HelloWord_Job", "HelloWorld_Group");
        
        
        // 构建调度任务
        scheduler.scheduleJob(jobDetail, trigger);
        
        // 创建SchedulerListener
        scheduler.getListenerManager().addSchedulerListener(new SimpleSchedulerListener());
        
        // 移除对应的SchedulerListener
//        scheduler.getListenerManager().removeSchedulerListener(new SimpleSchedulerListener());
        
        logger.info("execute scheduler");
        // 开启调度器""
        scheduler.start();
        
        Thread.sleep(20000);
        
        scheduler.shutdown();
        
        logger.info("shut down scheduler");
    }

    protected Scheduler createScheduler() throws SchedulerException{
        return StdSchedulerFactory.getDefaultScheduler(); 
    }
    
    protected JobDetail createJobDetail(String jobName, String jobGroup){
        return JobBuilder.newJob(HelloWorldJob.class)
                .withIdentity(jobName, jobGroup)
                .build();
    }
    
    protected Trigger createTrigger(String triggerName, String triggerGroup){
        return  TriggerBuilder.newTrigger()
                .withIdentity(triggerName, triggerGroup)
                .withSchedule(
                        SimpleScheduleBuilder.simpleSchedule()
                        .withIntervalInSeconds(10)
                        .repeatForever()
                        ).build();
    }
}

执行后的结果如下：

2017-07-16 19:13:59 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] init scheduler componets
  2017-07-16 19:14:00 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] execute scheduler
  2017-07-16 19:14:00 [INFO]-[org.ws.quartz.test3.SimpleSchedulerListener] scheduler is being started
  2017-07-16 19:14:00 [INFO]-[org.ws.quartz.test3.SimpleSchedulerListener] scheduler has been started
  2017-07-16 19:14:00 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 19:14:10 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 19:14:20 [INFO]-[org.ws.quartz.test3.HelloWorldJob] Hello World
  2017-07-16 19:14:20 [INFO]-[org.ws.quartz.test3.SimpleSchedulerListener] scheduler is in standby mode
  2017-07-16 19:14:20 [INFO]-[org.ws.quartz.test3.SimpleSchedulerListener] scheduler is being shutdown
  2017-07-16 19:14:20 [INFO]-[org.ws.quartz.test3.SimpleSchedulerListener] scheduler has been shutdown
  2017-07-16 19:14:20 [INFO]-[org.ws.quartz.test3.SimpleQuartzExample] shut down scheduler