Producer consumer in Java 1 : Producer Consumer « Threads « Java






Producer consumer in Java 1

Producer consumer in Java 1

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

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

/** Producer-Consumer in Java. Version 1.
 */
public class ProdCons1 {

  protected LinkedList list = new LinkedList();

  protected void produce() {
    int len = 0;
    synchronized(list) {
      Object justProduced = new Object();
      list.addFirst(justProduced);
      len = list.size();
      list.notifyAll();
    }
    System.out.println("List size now " + len);
  }

  protected void consume() {
    Object obj = null;
    int len = 0;
    synchronized(list) {
      while (list.size() == 0) {
        try {
          list.wait();
        } catch (InterruptedException ex) {
          return;
        }
      }
      obj = list.removeLast();
      len = list.size();
    }
    System.out.println("Consuming object " + obj);
    System.out.println("List size now " + len);
  }

  public static void main(String[] args) throws IOException {
    ProdCons1 pc = new ProdCons1();
    System.out.println("Ready (p to produce, c to consume):");
    int i;
    while ((i = System.in.read()) != -1) {
      char ch = (char)i;
      switch(ch) {
        case 'p':  pc.produce(); break;
        case 'c':  pc.consume(); break;
      }
    }
  }
}


           
       








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