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: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:当一个或一组 JobDetail 暂停时调用这个方法。
7) jobsResumed: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: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:当Scheduler 开启时,调用该方法
10) schedulerInStandbyMode: 当Scheduler处于StandBy模式时,调用该方法
11) schedulerShutdown:当Scheduler停止时,调用该方法
12) schedulingDataCleared:当Scheduler中的数据被清除时,调用该方法。
jobToBeExecuted