在Java中,Quartz调度器本身并不直接支持任务优先级。但是,你可以通过自定义一个实现org.quartz.spi.TriggerFiredBundle
接口的类来实现任务优先级。
以下是一个简单的示例,展示了如何实现一个带有优先级的触发器:
org.quartz.spi.TriggerFiredBundle
接口:import org.quartz.JobDetail;
import org.quartz.Trigger;
import org.quartz.spi.TriggerFiredBundle;
public class PriorityTriggerFiredBundle implements TriggerFiredBundle {
private final TriggerFiredBundle delegate;
private final int priority;
public PriorityTriggerFiredBundle(TriggerFiredBundle delegate, int priority) {
this.delegate = delegate;
this.priority = priority;
}
@Override
public JobDetail getJobDetail() {
return delegate.getJobDetail();
}
@Override
public Trigger getTrigger() {
return delegate.getTrigger();
}
@Override
public Job getJob() {
return delegate.getJob();
}
public int getPriority() {
return priority;
}
}
JobStore
,继承自org.quartz.simpl.RAMJobStore
或其他你喜欢的JobStore
实现,并重写acquireNextTriggers
方法。在这个方法中,你可以根据任务的优先级对触发器进行排序。import org.quartz.impl.jdbcjobstore.JobStoreSupport;
import org.quartz.spi.OperableTrigger;
import org.quartz.spi.TriggerFiredResult;
import java.util.Comparator;
import java.util.List;
public class PriorityJobStore extends JobStoreSupport {
// ... 其他方法和属性
@Override
public List<OperableTrigger> acquireNextTriggers(long noLaterThan, int maxCount, long timeWindow) {
List<OperableTrigger> triggers = super.acquireNextTriggers(noLaterThan, maxCount, timeWindow);
triggers.sort(Comparator.comparingInt(trigger -> ((PriorityTriggerFiredBundle) trigger).getPriority()));
return triggers;
}
}
JobStore
添加到Quartz调度器中。这可以通过编程方式或在quartz.properties
文件中完成。请注意,这只是一个简单的示例,你可能需要根据你的需求进行调整。此外,这种方法可能会影响调度器的性能,因为它需要对触发器进行排序。在使用此方法时,请确保对性能进行充分的测试。