java 为方法设置时间限制/超时
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Set a time limit / timeout for a method
提问by Lasse A Karlsen
I have a simple method like this:
我有一个像这样的简单方法：
public void foo(int runForHowLong) {
Motor.A.forward();
}
Now a want to be able to pass an argument to foo(), which sets a time limit for how long foo() will run. Like if I send foo(2), it runs for 2 seconds.
现在希望能够将参数传递给 foo()，它设置了 foo() 运行多长时间的时间限制。就像我发送 foo(2) 一样，它会运行 2 秒。
回答by yegor256
You can use AOP and a @Timeableannotation from jcabi-aspects(I'm a developer):
您可以使用 AOP 和@Timeable来自jcabi-aspects的注释（我是开发人员）：
class Motor {
@Timeable(limit = 1, unit = TimeUnit.SECONDS)
void forward() {
// execution as usual
}
}
When time limit is reached your thread will get interrupted()flag set to trueand it's your job to handle this situation correctly and to stop execution.
当达到时间限制时，您的线程将被interrupted()设置为标志，true您的工作是正确处理这种情况并停止执行。
回答by rit
Look at this question on Stackoverflow: Run code for x seconds in Java?
看看 Stackoverflow 上的这个问题：Run code for x seconds in Java?
It is exactly the same related to the requirements.
它与要求完全相同。
As I interprete from your question you'd like to have the method running for 2 minutes. To achieve that you need to start a Thread which you control for 2 minutes and then stop the thread.
正如我从您的问题中解释的那样，您希望该方法运行 2 分钟。为此，您需要启动一个您控制 2 分钟的线程，然后停止该线程。
回答by Kounavi
The TimeUnitclass provides method required for this.
Check it out here: TimeUnit in JDK 6
的TimeUnit类提供此要求的方法。
在这里查看：JDK 6 中的 TimeUnit
回答by Jon Newmuis
If you want for it to run for two seconds, you can use
Thread.sleep(2000). Note thatThread.sleep(2000)is more of a "suggestion" than a "command"; it will not run for exactly2000 milliseconds, due to scheduling in the JVM. It can pretty much be simplified to be roughly2000 milliseconds.If you want it to continue calling
forwardfor 2 seconds (which would result in quite a few invocations of the function), you will need to use a timer of some sort.
如果你想让它运行两秒钟，你可以使用
Thread.sleep(2000). 请注意，这Thread.sleep(2000)更像是“建议”而不是“命令”；它不会运行恰好2000毫秒，由于JVM调度。它几乎可以简化为大约2000 毫秒。如果您希望它继续调用
forward2 秒（这将导致该函数多次调用），您将需要使用某种计时器。
