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 $
*
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* 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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