ManualResetEvent.java

package com.lgq.rssreader.core;

//ManualResetEvent ��Javaʵ��
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class ManualResetEvent
{
  private volatile CountDownLatch event;
  private final Integer mutex;

  public ManualResetEvent(boolean signalled)
  {
      mutex = new Integer(-1);
      if (signalled)
      {
          event = new CountDownLatch(0);
      }
      else
      {
          event = new CountDownLatch(1);
      }
  }

  public void set()
  {
      event.countDown();
  }

  public void reset()
  {
      synchronized (mutex)
      {
          if (event.getCount() == 0)
          {
              event = new CountDownLatch(1);
          }
      }
  }

  public void waitOne() throws InterruptedException
  {
      event.await();
  }

  public boolean waitOne(int timeout, TimeUnit unit) throws InterruptedException
  {
      return event.await(timeout, unit);
  }

  public boolean isSignalled()
  {
      return event.getCount() == 0;
  }

  public boolean waitOne(int timeout) throws InterruptedException
  {
      return waitOne(timeout, TimeUnit.MILLISECONDS);
  }

}