Producer consumer for J2SE 1.5 using concurrent
/*
* 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
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* notice, this list of conditions and the following disclaimer.
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* 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
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* 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.*;
import java.util.concurrent.*;
/** Producer-Consumer in Java, for J2SE 1.5 using concurrent.
*/
public class ProdCons15 {
protected boolean done = false;
/** Inner class representing the Producer side */
class Producer implements Runnable {
protected BlockingQueue queue;
Producer(BlockingQueue theQueue) { this.queue = theQueue; }
public void run() {
try {
while (true) {
Object justProduced = getRequestFromNetwork();
queue.put(justProduced);
System.out.println("Produced 1 object; List size now " + queue.size());
if (done) {
return;
}
}
} catch (InterruptedException ex) {
System.out.println("Producer INTERRUPTED");
}
}
Object getRequestFromNetwork() { // Simulation of reading from client
try {
Thread.sleep(10); // simulate time passing during read
} catch (InterruptedException ex) {
System.out.println("Producer Read INTERRUPTED");
}
return(new Object());
}
}
/** Inner class representing the Consumer side */
class Consumer implements Runnable {
protected BlockingQueue queue;
Consumer(BlockingQueue theQueue) { this.queue = theQueue; }
public void run() {
try {
while (true) {
Object obj = queue.take();
int len = queue.size();
System.out.println("List size now " + len);
process(obj);
if (done) {
return;
}
}
} catch (InterruptedException ex) {
System.out.println("CONSUMER INTERRUPTED");
}
}
void process(Object obj) {
// Thread.sleep(xxx) // Simulate time passing
System.out.println("Consuming object " + obj);
}
}
ProdCons15(int nP, int nC) {
BlockingQueue myQueue = new LinkedBlockingQueue();
for (int i=0; i<nP; i++)
new Thread(new Producer(myQueue)).start();
for (int i=0; i<nC; i++)
new Thread(new Consumer(myQueue)).start();
}
public static void main(String[] args)
throws IOException, InterruptedException {
// Start producers and consumers
int numProducers = 4;
int numConsumers = 3;
ProdCons15 pc = new ProdCons15(numProducers, numConsumers);
// Let the simulation run for, say, 10 seconds
Thread.sleep(10*1000);
// End of simulation - shut down gracefully
pc.done = true;
}
}
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