春天的Cron表达

Question

I have one requirement to send mails on weekly basis at some point based on some database check and its working perfectly fine with below config.

<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> 
    <property name="jobDetails">
        <list>              
            <ref bean="emailWeeklyNotification"/>
        </list>
    </property> 
    <property name="triggers">
        <list> 
            <ref bean="emailWeeklyTrigger"/>
        </list>
    </property>
</bean>

<bean id="emailWeeklyTrigger"   class="org.springframework.scheduling.quartz.CronTriggerBean"> 
    <property name="jobDetail" ref="emailWeeklyNotification" />  
    <property name="cronExpression" value="${email.weekly.sched}" /> 
</bean>

<bean id="emailWeeklyNotification" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">     
    <property name="targetObject" ref="emailService" />
    <property name="targetMethod" value="myMthod" />     
</bean>

${email.weekly.sched} for this value is coming from DB like "0 0 6 ? * MON"

emailService is a my Class which is having this method with some other placeholders.

So my question is, what to write in this expression which will break Spring's code so my scheduler method should not be called becuse there is nothing in DB and still mails are going.

Though this going to be a temp fix becuase we have new code, which is checking the size of collection before sending mails, but not in PROD.

I tried writing like "0 -1 17 ? * THU" or "0 56 17 ? * FUN" but its failing in deployment itself.

Please suggest.

Thanks

Answer 1

org.springframework.util.StringUtils.CronSequenceGenerator接缝无法使模式停止触发。