public static void main( String[] args ){
Lock lock = new Lock();
final Consumer consumer1 = new Consumer( lock, 1 );
final Consumer consumer2 = new Consumer( lock, 2 );
final Producer producer = new Producer( lock );
(new Thread( new Runnable() {
public void run() {
consumer1.consume();
}
})).start();
(new Thread( new Runnable() {
public void run() {
consumer2.consume();
}
})).start();
(new Thread( new Runnable() {
public void run() {
producer.produce();
}
})).start();
}
public static final class Lock {
public Lock() {
super();
lock();
}
public boolean isAvailable() {
return available;
}
public void lock() {
available = false;
}
public void unlock() {
available = true;
}
private boolean available = false;
}
public static final class Consumer {
public Consumer( Lock lock, int id ) {
this .lock = lock;
this .id = id;
}
public void consume() {
System.out.println( "Consumer " + id + ": consume was called" );
synchronized ( lock ) {
while ( !lock.isAvailable() ) {
System.out.println( "Consumer" + id + ": waiting..." );
try {
lock.wait();
} catch (InterruptedException e) {}
}
}
System.out.println( "Consumer" + id + ": exiting" );
}
private Lock lock;
private int id;
}
public static final class Producer {
public Producer( Lock lock ) {
this .lock = lock;
}
public void produce() {
System.out.println( "Producer: produce was called" );
System.out.println( "Producer: unlocking..." );
lock.unlock();
lock.notifyAll();
System.out.println( "Producer: exiting" );
}
private Lock lock;
}
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