// concurrency/Restaurant25.java
// TIJ4 Chapter Concurrency, Exercise 25, page 1212
// In the Chef class in Restaurant.java, return from run() after 
// calling shutdownNow() and observe the difference in behavior.

/* My solution to one of the exercises in 
* Thinking in Java 4th Edition (by Bruce Eckel).
* It compiles and runs correctly using JDK 1.6.0
* @author Greg Gordon
* @author www.greggordon.org
* September, 2009
*/

import java.util.concurrent.*;
import static net.mindview.util.Print.*;

class Meal {
	private final int orderNum;
	public Meal(int orderNum) { this.orderNum = orderNum; }
	public String toString() { return "Meal " + orderNum; }
}

class WaitPerson25 implements Runnable {
	private Restaurant25 restaurant;
	public WaitPerson25(Restaurant25 r) { restaurant = r; }
	public void run() {
		try {
			while(!Thread.interrupted()) {
				synchronized(this) {
					while(restaurant.meal == null)
						wait(); // ... for the chef to produce a meal
				}
				print("WaitPerson25 got " + restaurant.meal);
				synchronized(restaurant.chef) {
					restaurant.meal = null;
					restaurant.chef.notifyAll(); // ready for another
				}
			}	
		} catch(InterruptedException e) {
			print("WaitPerson25 interrupted");
		}
	}
}

class Chef25 implements Runnable {
	private Restaurant25 restaurant;
	private int count = 0;
	public Chef25(Restaurant25 r) { restaurant = r; }
	public void run() {
		try {
			while(!Thread.interrupted()) {
				synchronized(this) {
					while(restaurant.meal != null) 
						wait(); // ... for the meal to be taken
				}
				if(++count == 10) {
					print("Out of food, closing");
					restaurant.exec.shutdownNow();
					return; // now Chef25 won't make another meal
				}
				printnb("Order up! ");
				synchronized(restaurant.waitPerson) {
					restaurant.meal = new Meal(count);
					restaurant.waitPerson.notifyAll();
				}
				TimeUnit.MILLISECONDS.sleep(100);
			}
		} catch(InterruptedException e) {
			print("Chef25 interrupted");
		}
	}	
}

public class Restaurant25 {
	Meal meal;
	ExecutorService exec = Executors.newCachedThreadPool();
	WaitPerson25 waitPerson = new WaitPerson25(this);
	Chef25 chef = new Chef25(this);
	public Restaurant25() {
		exec.execute(chef);
		exec.execute(waitPerson);
	}
	public static void main(String[] args) {
		new Restaurant25();
	}
}