当关机挂钩坏了 [英] When Shutdown Hooks Break Bad

问题描述

如果我将 shutdown hook 添加到我的Java程序的运行时，如下所示：

If I add a shutdown hook to my Java program's runtime like so:

public class MyShutdownHook implements Runnable
{
    @Override
    public void run()
    {
        // Stuff I want executed anytime
        // the program, Java, or the OS exits normally,
        // crashes, or terminates unexpectedly for any reason.
    }
}

// The in another method...
Runtime.getRuntime().addShutdownHook(new MyShutdownHook());

...然后曾 任何情况下 run（）当程序/ Java / OS正常退出，崩溃或意外终止时，方法将不会执行？如果是这样，什么情况可以绕过运行时的关闭钩子，为什么？

...then are there ever any situations where that run() method won't execute when the program/Java/OS exits normally, crashes or terminates unexpectedly? If so, what situations would be able to by-pass Runtime's shutdown hook, and why?

推荐答案

• 如果进程被终止，则不会执行关闭挂钩。

  • If the process is killed, a shutdown hook will not be executed.

    如果进程崩溃，将不会执行关闭挂钩。

    If the process crashes, a shutdown hook will not be executed.

    如果你有一个Windows服务，并且关闭钩子需要很长时间才能执行，它将被终止。

    If you have a Windows service and the shutdown hook takes to long to execute, it will be terminated.

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