java - 如何在 Spring MVC 中设置 quartz 触发器的优先级

Question

我使用带有 cron 表达式的 Quartz 调度程序来在我的 Java Spring MVC 应用程序中定期执行一些任务。在我的 root-context.xml 文件中，我有以下内容:

<!--Quartz Scheduler Beans   -->

    <bean id="emailNotificationJob" 
    class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">

    <property name="targetObject" ref="eventsService" />
    <property name="targetMethod" value="sendEventEmailNotification" />
    <property name="concurrent" value="false" />    <!-- this is the property to prevent concurrent execution -->
    </bean>

    <bean id="deleteWebContentsJob" 
    class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">

    <property name="targetObject" ref="webContentDefinitionService" />
    <property name="targetMethod" value="deleteWebContents" />
    <property name="concurrent" value="false" />    
    </bean>


    <bean id="saveStaticContentsJob" 
    class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">

    <property name="targetObject" ref="webContentDefinitionService" />
    <property name="targetMethod" value="saveStaticContents" />
    <property name="concurrent" value="false" />    
    </bean>

    <bean id="emailTrigger" 
                class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">

    <property name="jobDetail" ref="emailNotificationJob" />
    <property name="cronExpression" value="0 0/1 * 1/1 * ? *" />

    </bean> 

    <bean id="deleteWebContentsTrigger" 
                class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">

    <property name="jobDetail" ref="deleteWebContentsJob"/>
    <property name="cronExpression" value="0 1 0 1/1 * ? *" />

    </bean>


    <bean id="staticContentsUploadTrigger" 
                class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">

    <property name="jobDetail" ref="saveStaticContentsJob" />
    <property name="cronExpression" value="0 0/1 * 1/1 * ? *" />

    </bean> 

    <!-- Scheduler factory bean to glue together jobDetails and triggers to Configure Quartz Scheduler -->
    <bean  class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <property name="jobDetails">
            <list>
                <ref bean="emailNotificationJob" />
                <ref bean="deleteWebContentsJob" />
                <ref bean="saveStaticContentsJob" />
            </list>
        </property>

        <property name="triggers">
            <list>
                <ref bean="emailTrigger" />
                <ref bean="deleteWebContentsTrigger" />
                 <ref bean="staticContentsUploadTrigger" />
            </list>
        </property>
    </bean>

    <!-- Quartz Bean End -->

我在我的应用程序中使用 Quartz Scheduler 2.2.1。

我想为各种触发器设置优先级。这里我有两个触发器，设置为以相同的时间间隔触发。我正在尝试将其中一个设置为优先级 1，另一个设置为优先级 2。有没有办法做到这一点。

Answer 1

CronTriggerFactoryBean 有一个名为 priority 的属性 (spring-context-support:4.2.4.RELEASE)。这又用于设置 CronTriggerImpl 的优先级，其具有 javadoc其中指出:

The priority of a Trigger acts as a tie breaker such that if two Triggers have the same scheduled fire time, then Quartz will do its best to give the one with the higher priority first access to a worker thread.

If not explicitly set, the default value is 5.

话又说回来，如果线程池中有足够的线程供两个进程使用，我不确定优先级是否会产生任何影响(取决于优先级是否也分配给实际的工作线程)。