如何停止使用@Scheduled 批注启动的计划任务? [英] How to stop a scheduled task that was started using @Scheduled annotation?
问题描述
我使用 Spring Framework 的 @Scheduled
注释.
I have created a simple scheduled task using Spring Framework's @Scheduled
annotation.
@Scheduled(fixedRate = 2000)
public void doSomething() {}
现在我想在不再需要时停止此任务.
Now I want to stop this task, when no longer needed.
我知道可能有一种替代方法可以在此方法开始时检查一个条件标志,但这不会停止此方法的执行.
I know there could be one alternative to check one conditional flag at the start of this method, but this will not stop execution of this method.
Spring 是否提供任何东西来停止 @Scheduled
任务?
Is there anything Spring provides to stop @Scheduled
task ?
推荐答案
选项 1:使用后处理器
供应ScheduledAnnotationBeanPostProcessor
并显式调用 postProcessBeforeDestruction(Object bean, String beanName)
,用于调度应该被阻止.
Option 1: Using a post processor
Supply ScheduledAnnotationBeanPostProcessor
and explicitly invoke postProcessBeforeDestruction(Object bean, String beanName)
, for the bean whose scheduling should be stopped.
private final Map<Object, ScheduledFuture<?>> scheduledTasks =
new IdentityHashMap<>();
@Scheduled(fixedRate = 2000)
public void fixedRateJob() {
System.out.println("Something to be done every 2 secs");
}
@Bean
public TaskScheduler poolScheduler() {
return new CustomTaskScheduler();
}
class CustomTaskScheduler extends ThreadPoolTaskScheduler {
@Override
public ScheduledFuture<?> scheduleAtFixedRate(Runnable task, long period) {
ScheduledFuture<?> future = super.scheduleAtFixedRate(task, period);
ScheduledMethodRunnable runnable = (ScheduledMethodRunnable) task;
scheduledTasks.put(runnable.getTarget(), future);
return future;
}
@Override
public ScheduledFuture<?> scheduleAtFixedRate(Runnable task, Date startTime, long period) {
ScheduledFuture<?> future = super.scheduleAtFixedRate(task, startTime, period);
ScheduledMethodRunnable runnable = (ScheduledMethodRunnable) task;
scheduledTasks.put(runnable.getTarget(), future);
return future;
}
}
当某个 bean 的调度不得不停止时,您可以查找映射以获取相应的 Future
并明确取消它.
When the scheduling for a bean has to be stopped, you can lookup the map to get the corresponding Future
to it and explicitly cancel it.
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