public class ActiveObjectDemo {
private ExecutorService ex = Executors.newSingleThreadExecutor();
private Random rand = new Random(47);
// Insert a random delay to produce the effect
// of a calculation time:
private void pause(int factor) {
try {
TimeUnit.MILLISECONDS.sleep(100 + rand.nextInt(factor));
} catch (InterruptedException e) {
print("sleep() interrupted");
}
}
public Future<Integer> calculateInt(final int x, final int y) {
return ex.submit(
new Callable<Integer>() {
public Integer call() {
print("starting " + x + " + " + y);
pause(500);
return x + y;
}
});
}
public Future<Float> calculateFloat(final float x, final float y) {
return ex.submit(
new Callable<Float>() {
public Float call() {
print("starting " + x + " + " + y);
pause(2000);
return x + y;
}
});
}
public void shutdown() {
ex.shutdown();
}
public static void main(String[] args) {
ActiveObjectDemo d1 = new ActiveObjectDemo();
// Prevents ConcurrentModificationException:
List<Future<?>> results = new CopyOnWriteArrayList<Future<?>>();
for (float f = 0.0f; f < 1.0f; f += 0.2f) results.add(d1.calculateFloat(f, f));
for (int i = 0; i < 5; i++) results.add(d1.calculateInt(i, i));
print("All asynch calls made");
while (results.size() > 0) {
for (Future<?> f : results)
if (f.isDone()) {
try {
print(f.get());
} catch (Exception e) {
throw new RuntimeException(e);
}
results.remove(f);
}
}
d1.shutdown();
}
} /* Output: (85% match)
public static void main(String[] args) throws Exception {
Car car = new Car();
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new WaxOff(car));
exec.execute(new WaxOn(car));
TimeUnit.SECONDS.sleep(5); // Run for a while...
exec.shutdownNow(); // Interrupt all tasks
}
public static void main(String[] args) throws Exception {
ToastQueue dryQueue = new ToastQueue(),
butteredQueue = new ToastQueue(),
finishedQueue = new ToastQueue();
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new Toaster(dryQueue));
exec.execute(new Butterer(dryQueue, butteredQueue));
exec.execute(new Jammer(butteredQueue, finishedQueue));
exec.execute(new Eater(finishedQueue));
TimeUnit.SECONDS.sleep(5);
exec.shutdownNow();
}
public static void main(String[] args) {
ExecutorService exec = Executors.newCachedThreadPool();
DelayQueue<Event> queue = new DelayQueue<Event>();
GreenhouseControls gc = new GreenhouseControls(queue);
gc.addEvent(gc.new Bell(900));
Event[] eventList = {
gc.new ThermostatNight(0),
gc.new LightOn(200),
gc.new LightOff(400),
gc.new WaterOn(600),
gc.new WaterOff(800),
gc.new ThermostatDay(1400)
};
gc.addEvent(gc.new Restart(2000, eventList));
if (args.length == 1) gc.addEvent(new GreenhouseControls.Terminate(new Integer(args[0]), exec));
exec.execute(gc);
}
public static void main(String[] args) throws Exception {
ExecutorService exec = Executors.newCachedThreadPool(new DaemonThreadFactory());
for (int i = 0; i < 10; i++) exec.execute(new DaemonFromFactory());
print("All daemons started");
TimeUnit.MILLISECONDS.sleep(500); // Run for a while
}