在Java中实现阻塞函数调用 [英] Implement a blocking function call in Java

问题描述

在Java中实现阻塞函数调用的建议/最佳方法是什么，稍后可以通过另一个线程的调用解除阻塞？

What is the recommended / best way to implement a blocking function call in Java, that can be later unblocked by a call from another thread?

基本上我想对一个对象有两个方法，其中第一个调用阻塞任何调用线程，直到第二个方法由另一个线程运行：

Basically I want to have two methods on an object, where the first call blocks any calling thread until the second method is run by another thread:

public class Blocker {

  /* Any thread that calls this function will get blocked */
  public static SomeResultObject blockingCall() {
     // ...      
  }

  /* when this function is called all blocked threads will continue */
  public void unblockAll() {
     // ...
  }

} 

意图BTW不仅仅是为了获得阻塞行为，

The intention BTW is not just to get blocking behaviour, but to write a method that blocks until some future point when it is possible to compute the required result.

推荐答案

您可以使用 CountDownLatch 。

latch = new CountDownLatch(1);

要阻止，请调用：

latch.await();

要解除封锁，请致电：

latch.countDown();

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