如何在Spring Quartz Scheduler中跳过特定的作业执行

问题描述

我为要每30分钟执行一次的作业设置了一个CronExpression.但是，如果先前的工作没有完成，我需要跳过特定的工作.

I have a CronExpression set for the job to be executed at every 30 minutes. But I need to skip a particular job if the earlier job is not complete.

例如我有100名员工的姓名要在数据库中更新，我将其称为"Job1"，从10AM开始.现在，情况就像"Job1"正在处理中，等到我有另一个作业"Job2"对齐时，我需要更新另外50个员工的姓名.我的问题是，我需要跳过作业2"和其他作业，直到当前运行的作业完成.

For eg. I have 100 Employee whose Names to be updated in the database and I terms it as "Job1" which starts at 10AM. Now the case is like "Job1" is in process and by the time I have another job- "Job2" aligned where I need to update another 50 Employee's names. My problem is this,I need to skip "Job2" and further jobs till my currently running Job is completed.

    <bean name="employeeNameUpdateJob" class="org.springframework.scheduling.quartz.JobDetailBean">
        <property name="name" value="Employee Update Job"/>
        <property name="group" value="Employee Update Group Job"/>
        <property name="jobClass"
            value="com.emp.scheduler.EmployeeUpdateScheduler" />
        <property name="volatility" value="false" />
    </bean>

<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
        <property name="name" value="Employee Update Trigger"/>
        <property name="group" value="Employee Update Group Trigger"/>
        <property name="volatility" value="false" />
        <property name="jobDetail" ref="employeeNameUpdateJob"/>
        <property name="cronExpression" value="0 0/30 * * * ?"/>
    </bean>

推荐答案

一种方法是实现TriggerListener接口，该接口提供了vetoJobExecution(Trigger trigger, JobExecutionContext context)方法来否决下一个作业的执行.从此方法返回true将停止执行作业.

One way is to implement TriggerListener interface, which provides a vetoJobExecution(Trigger trigger, JobExecutionContext context) method to veto the execution of a next job. Returning true from this method will stop the execution of job.

接口文档: http ://quartz-scheduler.org/api/2.0.0/org/quartz/TriggerListener.html#vetoJobExecution(org.quartz.Trigger ，org.quartz.JobExecutionContext)

Interface documentation: http://quartz-scheduler.org/api/2.0.0/org/quartz/TriggerListener.html#vetoJobExecution(org.quartz.Trigger, org.quartz.JobExecutionContext)

示例:

//SampleTriggerListener.java
public class SampleTriggerListener implements TriggerListener {

    @Override
    public boolean vetoJobExecution(Trigger trigger, JobExecutionContext ctx) {
        if(!previousJobCompleted)
            return true;

        return false;
    }
}


//Main.java
//init jobs, trigger & scheduler
this.scheduler.addTriggerListener(new SampleTriggerListener());
this.scheduler.start();

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