java中调度可运行任务

发布于 2024-08-19 03:54:14 字数 547 浏览 10 评论 0原文

我正在跟进一个有趣的问题，关于使用 ScheduledThreadPoolExecutor 执行某些重复任务。

调度此对象会返回一个 ScheduledFuture 对象，可使用该对象取消任务的下一次运行。

这里需要注意的一件事是任务本身与时间表完全解耦——

ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(1);
ScheduledFuture nextSchedule = 
    executor.schedule(task, 60000, TimeUnit.MILLISECONDS);

其中——

SomeTask task = new SomeTask();

所以任务本身不知道时间表。请告知是否有办法让任务取消并为自己创建新的计划。

谢谢

原文

I am following up an interesting question on so, on usage of ScheduledThreadPoolExecutor for some repeating task.

Scheduling this object returns a ScheduledFuture object which one can use to cancel the next run of the task.

One thing to note here is the task itself is completely decoupled from the schedule--

ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(1);
ScheduledFuture nextSchedule = 
    executor.schedule(task, 60000, TimeUnit.MILLISECONDS);

where-

SomeTask task = new SomeTask();

So the task itself is not aware of the schedule. Please enlighten if there is a way to get the task to cancel and create a new schedule for itself.

Thanks

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浅黛梨妆こ 2024-08-26 03:54:14

任务没有理由无法引用 ScheduledExecutorService 并在需要时安排自身再次运行：

// (Need to make variable final *if* it is a local (method) variable.)
final ScheduledExecutorService execService = Executors.newSingleThreadScheduledExecutor();

// Create re-usable Callable.  In cases where the Callable has state
// we may need to create a new instance each time depending on requirements.
Callable<Void> task = new Callable() {
  public Void call() {
    try {
      doSomeProcessing();
    } finally {
      // Schedule same task to run again (even if processing fails).
      execService.schedule(this, 1, TimeUnit.SECONDS);
    }
  }
}

There's no reason why the task cannot reference the ScheduledExecutorService and schedule itself to run again if required:

// (Need to make variable final *if* it is a local (method) variable.)
final ScheduledExecutorService execService = Executors.newSingleThreadScheduledExecutor();

// Create re-usable Callable.  In cases where the Callable has state
// we may need to create a new instance each time depending on requirements.
Callable<Void> task = new Callable() {
  public Void call() {
    try {
      doSomeProcessing();
    } finally {
      // Schedule same task to run again (even if processing fails).
      execService.schedule(this, 1, TimeUnit.SECONDS);
    }
  }
}

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