queue.java

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/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.util.Vector;

public class Queue {
  protected Vector queue;
  
  public Queue () {
    queue = new Vector ();
  }

  public Object remove () throws InterruptedException {
    synchronized (queue) {
      while (queue.isEmpty ()) {
        queue.wait ();
      }
      Object item = queue.firstElement ();
      queue.removeElement (item);
      return item;
    }
  }

  public void add (Object item) {
    synchronized (queue) {
      queue.addElement (item);
      queue.notify ();
    }
  }

  public boolean isEmpty () {
    return queue.isEmpty ();
  }
}