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spring框架使用任务调度quartz的例子-TriggerListener 篇

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有时候我们的任务(Job)需要再某些任务完成之后才能进行;例如从旧的数据库批量导数据的时候;需要现将被其他数据依赖的数据导入新的数据库;然后再进行关系的导入.。在这种情况下我们就可以使用Quartz的listener来做文章了。

  首先我们写一个主任务的类,命名为MainJob;她的作用是作为一系列任务的开始点。

  MainJob.Java

package jobs;
import org.apache.log4j.Logger;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springFramework.scheduling.quartz.QuartzJobBean;
public class MainJob extends QuartzJobBean {
  private Logger logger = Logger.getLogger(getClass());
  @Override
  protected void executeInternal(JobExecutionContext arg0)
      throws JobExecutionException {
    // TODO Auto-generated method stub
    logger.debug("Just say hi.");
  }
}

  然后我们新建另外一个任务(SecondJob)作为后续任务:

SecondJob.java
package jobs;
import org.apache.log4j.Logger;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.scheduling.quartz.QuartzJobBean;
public class SecondJob extends QuartzJobBean {
  private Logger logger = Logger.getLogger(getClass());
  @Override
  protected void executeInternal(JobExecutionContext arg0)
      throws JobExecutionException {
    // TODO Auto-generated method stub
    logger.debug("I'm the second job.");
  }
} 


  创建一个TriggerListener,重写其triggerComplete方法,并且添加一些方便spring注入的属性和方法。

NextJobTriggerListener.Java
package listeners;
import org.apache.log4j.Logger;
import org.quartz.JobDetail;
import org.quartz.JobExecutionContext;
import org.quartz.Scheduler;
import org.quartz.Trigger;
import org.quartz.listeners.TriggerListenerSupport;
import org.springFramework.scheduling.quartz.QuartzJobBean;
import org.springframework.scheduling.quartz.SimpleTriggerBean;
public class NextJobTriggerListener extends TriggerListenerSupport {
  private Logger logger = Logger.getLogger(getClass());
  private String name;
  public String getName() {
    return this.name;
  }
  public void setName(String name)
  {
    this.name=name;
  }
  private SimpleTriggerBean nextTrigger;
  public void setNextTrigger(SimpleTriggerBean nextTrigger) {
    this.nextTrigger = nextTrigger;
  }
  @Override
  public void triggerComplete(Trigger trigger, JobExecutionContext context, int code) {
    try{
    Scheduler schduler=context.getScheduler();
    JobDetail nextJob=nextTrigger.getJobDetail();
    //查找名称和即将加入的任务一样的任务
    JobDetail oldJob=schduler.getJobDetail(nextJob.getName(),nextJob.getGroup());
    //查找名称和即将加入的触发器一样的触发器
    Trigger oldTrigger=schduler.getTrigger( nextTrigger.getName(),nextTrigger.getGroup());
    if(oldJob==null&&oldTrigger==null)//同名的任务和触发器都不存在
    {
      logger.debug("inside scheduleJob."+code);
      schduler.scheduleJob(nextJob,nextTrigger);
    }else//同名的任务或触发器
    {
      logger.debug("oldJob==null:"+(oldJob==null));
      logger.debug("oldTrigger==null:"+(oldTrigger==null));  
    }
    super.triggerComplete(trigger, context, code);
    }catch(Exception e)
    {
      e.printStackTrace();
    }
  }
}


  配置spring 的applicationContext.XML

  applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springFramework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:jee="http://www.springframework.org/schema/jee"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
      http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.0.xsd">
  <!-- 主任务 -->
  <bean id="mainJob"
    class="org.springframework.scheduling.quartz.JobDetailBean">
    <!-- 运行的类 -->
    <property name="jobClass">
      <value>jobs.MainJob</value>
    </property>
  </bean>
  <!-- 主任务的监听器 -->
  <bean id="mainTriggerListener"
        class="listeners.NextJobTriggerListener">
        <!-- 下个触发器 -->
        <property name="nextTrigger" ref="secondTrigger"></property>
        <!-- 监听器名称 -->
        <property name="name" value="mainTriggerListener"></property>
  </bean>
  <!-- 主任务的触发器 -->
  <bean id="mainTrigger"
    class="org.springframework.scheduling.quartz.SimpleTriggerBean">
    <property name="jobDetail">
      <!-- 上面创建的任务调度对象 -->
      <ref bean="mainJob" />
    </property>
    <!-- 启动60秒后执行任务调度的excute方法 -->
    <property name="startDelay">
      <value>6000</value>
    </property>
    <!-- 运行次数 -->
    <property name="repeatCount">
      <value>0</value>
    </property>
    <!-- 隔一个小时运行一次(貌似多余,不写会报错) -->
    <property name="repeatInterval">
      <value>3600000</value>
    </property>
    <property name="triggerListenerNames">
      <list>
        <value>mainTriggerListener</value>
      </list>
    </property>
  </bean>
  <!-- 后续任务 -->
  <bean id="secondJob"
    class="org.springframework.scheduling.quartz.JobDetailBean">
    <!-- 运行的类 -->
    <property name="jobClass">
      <value>jobs.SecondJob</value>
    </property>
  </bean>
  <!-- 后续任务的触发器 -->
  <bean id="secondTrigger"
    class="org.springframework.scheduling.quartz.SimpleTriggerBean">
    <property name="jobDetail">
      <!-- 上面创建的任务调度对象 -->
      <ref bean="secondJob" />
    </property>
    <!-- 启动6秒后执行任务调度的excute方法 -->
    <property name="startDelay">
      <value>6000</value>
    </property>
    <!-- 运行次数 -->
    <property name="repeatCount">
      <value>0</value>
    </property>
    <!-- 隔一个小时运行一次(貌似多余,不写会报错) -->
    <property name="repeatInterval">
      <!--
      <value>3600000</value>
       -->
       <value>6000</value>
    </property>
  </bean>
  <!-- 任务调度工厂类 -->
  <bean
    class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
    <!-- 这一部分的配置不用管 -->
    <property name="quartzProperties">
      <props>
        <prop key="org.quartz.threadPool.class">
          org.quartz.simpl.SimpleThreadPool
        </prop>
        <prop key="org.quartz.threadPool.threadCount">10</prop>
        <prop key="org.quartz.threadPool.threadPriority">
          5
        </prop>
        <prop
          key="org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread">
          true
        </prop>
      </props>
    </property>
    <!-- 触发器,可以放一大堆触发器 -->
    <property name="triggers">
      <list>
        <!-- 在这里加 -->
         <ref bean="mainTrigger"/>
      </list>
    </property>
    <property name="triggerListeners">
      <list>
        <!-- 触发器的监听器 -->
        <ref bean="mainTriggerListener"/>
      </list>
    </property>
  </bean>
</beans>    开启服务器,输出


DEBUG [MainJob.executeInternal(14)] Just say hi.
DEBUG [NextJobTriggerListener.triggerComplete(38)] inside scheduleJob.3
DEBUG [SecondJob.executeInternal(14)] I'm the second job.
DEBUG [NextJobTriggerListener.triggerComplete(43)] oldJob==null:false
DEBUG [NextJobTriggerListener.triggerComplete(44)] oldTrigger==null:false    另外这里一个任务只绑定了一个简单的触发器,这样做是为了比较方便地可以检测到任务完成的情况;至于任务的具体内容就任由大家发挥了。写这篇文章希望能有人在其中获得启发。

 

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