在java中调度可运行的任务

Question

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

调度此对象将返回ScheduledFuture对象,可以使用该对象取消下一次任务运行.

这里要注意的一件事是任务本身与时间表完全脱钩 -

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

哪里-

SomeTask task = new SomeTask();

所以任务本身并不了解时间表.如果有办法让任务取消并为自己创建一个新的时间表,请启发.

谢谢

Answer 1

ScheduledExecutorService如果需要,没有理由为什么任务无法引用并安排自己再次运行:

// (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);
    }
  }
}