Order.java Source code

Introduction

Here is the source code for Order.java

Source

// : c13:Restaurant.java
// The producer-consumer approach to thread cooperation.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

class Order {
    private static int i = 0;

    private int count = i++;

    public Order() {
        if (count == 10) {
            System.out.println("Out of food, closing");
            System.exit(0);
        }
    }

    public String toString() {
        return "Order " + count;
    }
}

class WaitPerson extends Thread {
    private Restaurant restaurant;

    public WaitPerson(Restaurant r) {
        restaurant = r;
        start();
    }

    public void run() {
        while (true) {
            while (restaurant.order == null)
                synchronized (this) {
                    try {
                        wait();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }
            System.out.println("Waitperson got " + restaurant.order);
            restaurant.order = null;
        }
    }
}

class Chef extends Thread {
    private Restaurant restaurant;

    private WaitPerson waitPerson;

    public Chef(Restaurant r, WaitPerson w) {
        restaurant = r;
        waitPerson = w;
        start();
    }

    public void run() {
        while (true) {
            if (restaurant.order == null) {
                restaurant.order = new Order();
                System.out.print("Order up! ");
                synchronized (waitPerson) {
                    waitPerson.notify();
                }
            }
            try {
                sleep(100);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}

public class Restaurant {

    Order order; // Package access

    public static void main(String[] args) {
        Restaurant restaurant = new Restaurant();
        WaitPerson waitPerson = new WaitPerson(restaurant);
        Chef chef = new Chef(restaurant, waitPerson);
    }
} ///:~