Saturday, February 13, 2010

simplest wait-notify app


String consume() {
synchronized (queue) {
while (queue.size() == 0) {
queue.wait(5000);
}
return queue.remove(0);
}
}
void produce(String s) {
synchronized(queue) {
queue.add(s);
queue.notify();
}
}
// entire test program is
public class WaitNotifyDemo{
final private List queue = new ArrayList();
final private Random rand=new Random();
public static void main(String[] args) {
final WaitNotifyDemo instance=new WaitNotifyDemo();
//an anon class implementing Runnable, passed into new Thread() as constructor arg
Thread t = new Thread(new Runnable(){
public void run() {
for(Integer i=0;i<100;i++) {
instance.produce(i.toString());
try {
int sleep = Math.abs(instance.rand.nextInt()%5000);
Thread.sleep(sleep);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
t.setName("producer");
t.start();
new Thread("consumer"){
public void run() {
for(;;) {
String item = instance.consume();
}
}
}.start();
}

String consume() {
synchronized (queue) {
while (queue.size() == 0) {
try {
queue.wait(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "] either timeout or notification happened");
}
String a= queue.remove(0);
System.out.println(Thread.currentThread().getName() + "] notification received. removing " + a);
return a;
}
}
void produce(String s) {
synchronized(queue) {
System.out.println(Thread.currentThread().getName() + "] notifying after producing " + s);
queue.add(s);
queue.notify();
}
}
}

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http://www.linkedin.com/in/tanbin