java中quartz的调度器能否设置任务优先级-乐工具技术知识

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：

首先，创建一个新的类，实现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;
    }
}

然后，创建一个自定义的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 acquireNextTriggers(long noLaterThan, int maxCount, long timeWindow) {
        List triggers = super.acquireNextTriggers(noLaterThan, maxCount, timeWindow);
        triggers.sort(Comparator.comparingInt(trigger -> ((PriorityTriggerFiredBundle) trigger).getPriority()));
        return triggers;
    }
}