在Java中,Quartz調度器本身并不直接支持任務優先級。但是,你可以通過自定義一個實現org.quartz.spi.TriggerFiredBundle
接口的類來實現任務優先級。
以下是一個簡單的示例,展示了如何實現一個帶有優先級的觸發器:
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
,繼承自org.quartz.simpl.RAMJobStore
或其他你喜歡的JobStore
實現,并重寫acquireNextTriggers
方法。在這個方法中,你可以根據任務的優先級對觸發器進行排序。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 {
// ... 其他方法和屬性
@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調度器中。這可以通過編程方式或在quartz.properties
文件中完成。請注意,這只是一個簡單的示例,你可能需要根據你的需求進行調整。此外,這種方法可能會影響調度器的性能,因為它需要對觸發器進行排序。在使用此方法時,請確保對性能進行充分的測試。