.NET的ManualResetEvent的和WaitHandle中的Java的等效 [英] Java Equivalent of .NET's ManualResetEvent and WaitHandle

问题描述

我想知道，如果Java提供了.NET的类的ManualResetEvent和WaitHandle中的等价物，因为我想编写一个给定的超时块，除非事件被触发code。

I would like to know if Java provides an equivalent of .NET's classes of ManualResetEvent and WaitHandle, as I would like to write code that blocks for a given timeout unless an event is triggered.

WaitHandle中和的ManualResetEvent的.NET类提供了一个很好的，无障碍的接口，即它也是线程安全的，据我所知，那么，是什么的Java所提供的？

The .NET classes of WaitHandle and ManualResetEvent provide a nice, hassle-free interface for that which is also thread-safe as far as I know, so what does Java has to offer?

推荐答案

你有没有考虑过使用等 / 通知 （相当于 Monitor.Wait 和 Monitor.Pulse ）呢？

Have you considered using wait/notify (the equivalent of Monitor.Wait and Monitor.Pulse) instead?

您将要检查的一点点，看看你是否真正的需要的等待（避免竞争条件），但它应该工作。

You'll want a little bit of checking to see whether you actually need to wait (to avoid race conditions) but it should work.

否则，像<一个href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/CountDownLatch.html"><$c$c>CountDownLatch可能做你想要的。

Otherwise, something like CountDownLatch may well do what you want.

编辑：我刚刚注意到 CountDownLatch 基本上是一次性使用 - 以后无法复位计数，据我所看到的。您可能希望<一个href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/Semaphore.html"><$c$c>Semaphore代替。使用的tryAcquire 这样的等待一个超时：

I've only just noticed that CountDownLatch is basically "single use" - you can't reset the count later, as far as I can see. You may want Semaphore instead. Use tryAcquire like this to wait with a timeout:

if (semaphore.tryAquire(5, TimeUnit.SECONDS)) {
   ...
   // Permit was granted before timeout
} else {
   // We timed out while waiting
}

请注意，这是不同于的ManualResetEvent ，每个成功调用的tryAcquire 将减少许可证的数量 - 所以最终他们会再次冒了出来。你不能让它永久的设置像你可以用的ManualResetEvent 。 （这将与 CountdownLatch 工作，但你不能重置吧：）

Note that this is unlike ManualResetEvent in that each successful call to tryAcquire will reduce the number of permits - so eventually they'll run out again. You can't make it permanently "set" like you could with ManualResetEvent. (That would work with CountdownLatch, but then you couldn't "reset" it :)

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