• quartz---的Scheduler


                           quartz---的Scheduler

        

      从这副图中可以很直观的看出来quartz的关系:

        调度:Scheduler任务调度器,是实际执行任务调度的控制器。在spring中通过SchedulerFactoryBean封装起来。

        触发器:Trigger 触发器,用于定义任务调度的时间规则,有SimpleTrigger,CronTrigger,DateIntervalTrigger和NthIncludedDayTrigger,其中CronTrigger用的比较多,本文主要介绍这种方式。CronTrigger在spring中封装在CronTriggerFactoryBean中。

       1)scheduler.start();scheduler.standby();用代码解释:

     1 package com.imooc.demo.helloQuartz;
     2 
     3 import java.text.SimpleDateFormat;
     4 import java.util.Date;
     5 
     6 import org.quartz.CronScheduleBuilder;
     7 import org.quartz.CronTrigger;
     8 import org.quartz.JobBuilder;
     9 import org.quartz.JobDetail;
    10 import org.quartz.Scheduler;
    11 import org.quartz.SchedulerException;
    12 import org.quartz.SchedulerFactory;
    13 import org.quartz.TriggerBuilder;
    14 import org.quartz.impl.StdSchedulerFactory;
    15 
    16 public class HelloScheduler {
    17 
    18     public static void main(String[] args) throws SchedulerException, InterruptedException {
    19         Date date = new Date();
    20         SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    21         System.out.println("Current Time is:"+sf.format(date));
    22         // 创建一个jobDatail实例,将该实力与helloJob绑定
    23         JobDetail detail = JobBuilder.newJob(HelloJob.class).withIdentity("myJob")
    24                 .build();
    25 
    26         //美每秒触发一次任务
    27         CronTrigger trigger = (CronTrigger)TriggerBuilder
    28                 .newTrigger()
    29                 .withIdentity("myTrigger", "group1")
    30                 //2017-2019每月的第二周的星期5下午14开始触发,每隔5秒允许一次
    31                 .withSchedule(CronScheduleBuilder.cronSchedule("* * * * * ?"))
    32                 .build();
    33         // 创建Scheduler实例
    34         SchedulerFactory factory = new StdSchedulerFactory();
    35         Scheduler scheduler = factory.getScheduler();
    36         scheduler.start();
    37         // 把jobDetail和Trigger与scheuler绑定在一起:触发启动
    38         System.out.println("----:"+sf.format(scheduler.scheduleJob(detail, trigger)));;
    39         Thread.sleep(2000L);
    40         //挂起
    41         scheduler.standby();
    42         
    43         //scheduler挂起3秒后继续执行
    44         Thread.sleep(3000L);
    45         scheduler.start();
    46     }
    47 }

        每秒执行一次,2秒后停止,执行3次后停止执行,运行结果:

      2)shutdown();

     1 package com.imooc.demo.helloQuartz;
     2 
     3 import java.text.SimpleDateFormat;
     4 import java.util.Date;
     5 
     6 import org.quartz.CronScheduleBuilder;
     7 import org.quartz.CronTrigger;
     8 import org.quartz.JobBuilder;
     9 import org.quartz.JobDetail;
    10 import org.quartz.Scheduler;
    11 import org.quartz.SchedulerException;
    12 import org.quartz.SchedulerFactory;
    13 import org.quartz.TriggerBuilder;
    14 import org.quartz.impl.StdSchedulerFactory;
    15 
    16 public class HelloScheduler {
    17 
    18     public static void main(String[] args) throws SchedulerException, InterruptedException {
    19         Date date = new Date();
    20         SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    21         System.out.println("Current Time is:"+sf.format(date));
    22         // 创建一个jobDatail实例,将该实力与helloJob绑定
    23         JobDetail detail = JobBuilder.newJob(HelloJob.class).withIdentity("myJob")
    24                 .build();
    25 
    26         //美每秒触发一次任务
    27         CronTrigger trigger = (CronTrigger)TriggerBuilder
    28                 .newTrigger()
    29                 .withIdentity("myTrigger", "group1")
    30                 //2017-2019每月的第二周的星期5下午14开始触发,每隔5秒允许一次
    31                 .withSchedule(CronScheduleBuilder.cronSchedule("* * * * * ?"))
    32                 .build();
    33         // 创建Scheduler实例
    34         SchedulerFactory factory = new StdSchedulerFactory();
    35         Scheduler scheduler = factory.getScheduler();
    36         scheduler.start();
    37         // 把jobDetail和Trigger与scheuler绑定在一起:触发启动
    38         System.out.println("----:"+sf.format(scheduler.scheduleJob(detail, trigger)));;
    39         Thread.sleep(2000L);
    40         //挂起
    41         scheduler.shutdown();
    42         
    43         //scheduler挂起3秒后继续执行
    44         Thread.sleep(3000L);
    45         scheduler.start();
    46     }
    47 }

    运行结果为:

        

       总结 :

        在shutdown()后,程序不能再从新start().

     1 package com.imooc.demo.helloQuartz;
     2 
     3 import java.text.SimpleDateFormat;
     4 import java.util.Date;
     5 
     6 import org.quartz.CronScheduleBuilder;
     7 import org.quartz.CronTrigger;
     8 import org.quartz.JobBuilder;
     9 import org.quartz.JobDetail;
    10 import org.quartz.Scheduler;
    11 import org.quartz.SchedulerException;
    12 import org.quartz.SchedulerFactory;
    13 import org.quartz.TriggerBuilder;
    14 import org.quartz.impl.StdSchedulerFactory;
    15 
    16 public class HelloScheduler {
    17 
    18     public static void main(String[] args) throws SchedulerException, InterruptedException {
    19         Date date = new Date();
    20         SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    21         System.out.println("Current Time is:"+sf.format(date));
    22         // 创建一个jobDatail实例,将该实力与helloJob绑定
    23         JobDetail detail = JobBuilder.newJob(HelloJob.class).withIdentity("myJob")
    24                 .build();
    25 
    26         //美每秒触发一次任务
    27         CronTrigger trigger = (CronTrigger)TriggerBuilder
    28                 .newTrigger()
    29                 .withIdentity("myTrigger", "group1")
    30                 //2017-2019每月的第二周的星期5下午14开始触发,每隔5秒允许一次
    31                 .withSchedule(CronScheduleBuilder.cronSchedule("* * * * * ?"))
    32                 .build();
    33         // 创建Scheduler实例
    34         SchedulerFactory factory = new StdSchedulerFactory();
    35         Scheduler scheduler = factory.getScheduler();
    36         scheduler.start();
    37         // 把jobDetail和Trigger与scheuler绑定在一起:触发启动
    38         System.out.println("----:"+sf.format(scheduler.scheduleJob(detail, trigger)));;
    39         Thread.sleep(2000L);
    40         //shutdown(true)标志等待所有正在执行的job执行完之后,再关闭scheduler
    41         //shutdown(false)即shutdown()表示job执行完毕之后,再关闭scheduler
    42         //shutdown挂起3秒后继续执行
    43         scheduler.shutdown(true);
    44         System.out.println("scheruler is shut down?:"+scheduler.isShutdown());
    45 
    46     }
    47 }

    运行结果:

      

    总结 :

        shutdown(true)标志等待所有正在执行的job执行完之后,再关闭scheduler

    总结 :
        shutdown(false)即关闭scheduler ,然后执行job之后,关掉程序

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  • 原文地址:https://www.cnblogs.com/meiLinYa/p/9021332.html
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