等待Timer在Java中完成 [英] Waiting for a Timer to finish in Java

问题描述

我正在使用 java.util。计时器安排定期任务。有一次，我想关闭它，等待它完成。

I'm using java.util.Timer to schedule a periodic task. At one point, I'd like to shut it down, and wait for it to finish.

Timer.cancel（）将阻止以后的任何任务运行。如何确保当前没有任何任务正在运行（或等待它们？）

Timer.cancel() will prevent any future tasks from running. How do I make sure any tasks are not running at the moment (or wait for them if they are?)

我可以引入外部同步机制，但我不知道看看它们如何涵盖所有案例。例如，如果我在任务中的某个监视器上进行同步，我仍然会错过任务刚刚开始执行但没有使用监视器的情况。

I can introduce external synchronization mechanisms, but I don't see how they can cover all cases. For example, if I synchronize on some Monitor within the task, I still miss the case when the task just started executing but didn't take the monitor.

什么是建议等待所有任务都完成，包括当前正在运行的任务？

What is the recommended practice for waiting until all tasks are really done, including currently running tasks?

推荐答案

你最好使用 ScheduledExecutorService 而不是Timer来安排定期任务。 ScheduledExecutorService提供了一个shutdown（）方法，该方法将执行任何挂起的任务。然后，您可以调用awaitTermination（）以等待shutdown（）完成。

You would be better using an ScheduledExecutorService instead of a Timer to schedule your periodic task. ScheduledExecutorService provides a shutdown() method that will execute any pending tasks. You can then call awaitTermination() to wait for shutdown() to finish.

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