consumer.java

JAVA网络编程技术内幕一书的源代码

/*
 * 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.io.*;
import java.util.*;

public class Consumer extends Thread {
  protected Vector objects;

  public Consumer () {
    objects = new Vector();
  }

  public void run () {
    try {
      while (true) {
        Object object = extract ();
        System.out.println (object);
      }
    } catch (InterruptedException ignored) {
    }
  }
  
  protected Object extract () throws InterruptedException {
    synchronized (objects) {
      while (objects.isEmpty ()) {
        objects.wait ();
      }
      Object object = objects.firstElement ();
      objects.removeElementAt (0);
      return object;
    }
  }
  
  public void insert (Object object) {
    synchronized (objects) {
      objects.addElement (object);
      objects.notify ();
    }
  }

  public static void main (String[] args) throws IOException, InterruptedException {
    Consumer consumer = new Consumer ();
    consumer.start ();
    BufferedReader keyboard = new BufferedReader (
      new FileReader (FileDescriptor.in));
    String line;
    while ((line = keyboard.readLine ()) != null) {
      consumer.insert (line);
      Thread.sleep (1000);
    }
  }
}