ProdCons1.java Source code

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Here is the source code for ProdCons1.java

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/*
 * 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;
            }
        }
    }
}