Set when quartz scheduled task trigger starts

This paper is finally updated at 757 Days ago, , The information may have developed or changed .

demand

• In order to put the trigger's Cron Expressions in the database , Convenient maintenance . Therefore, you need to go to the database to get the data when the project is started Cron expression , And configure the trigger , Add to the scheduler .

Realization

• When configuring scheduled tasks Bean when , By setting init Method , Implementation configuration Bean Get from the database Cron expression .
• Because it needs to be added ini Method , So you need to create a new class , Inherit CronTriggerBean.
• stay ini Method from the database Cron expression , And set it to trigger in .

<bean id="Task" class="xxx" >
</bean>

<bean id="TaskDetail"
        class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
    <property name="targetObject">
        <ref bean="Task" />
    </property>
    <property name="targetMethod">
        <value>exec</value>
    </property>
</bean>
<!-- Trigger Cron The expression is obtained from the database at startup  -->  
<bean id="TaskTrigger" class="CronTriggerBean"
    lazy-init="false" init-method="init">
    <property name="jobDetail" ref="TaskDetail" />
</bean>

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public class CronTriggerBean extends CronTriggerBean{
    public void init(){
        String hql = "xxx";        
        List<TRetryCron> list = Dao.getHibernateTemplate().find(sb.toString());
        String cronExpression=null;
        if(null!=list&&list.size()>0){
            cronExpression=list.get(0).getCCronExpression();
        }else{
            //  Avoid failing to get... From the database Cron expression , Cause exception , Here's one that will never be implemented Cron expression 
            cronExpression="0 0 5 31 2 ?";
            logger.error(" Failed to get a valid... From the database Cron expression .");    
        }
        try {
            super.setCronExpression(cronExpression);
        } catch (ParseException e) {
            logger.error(String.format(" analysis Cron Expression failed , Set a never executed Cron expression 【0 0 5 31 2 ?】, Failed parsing Cron Expression for 【%s】.", cronExpression));   
            //  analysis Crontab Expression failed , Set a never executed Cron expression 
            try {
                super.setCronExpression("0 0 5 31 2 ?");
            } catch (ParseException e1) {
            }
        }
    }
}

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