I can't pass the second requirement.

Question about the task

Restaurant (part 21)

Java Multithreading, Level 9, Lesson 15

Resolved

Maybe the cause is not in the OrderManager constructor?

We continue to fix the bug.

Now all the orders arrive in the queue, but they don't reach the cooks.
We'll make OrderManager find any available cook and give it an order. To implement this logic, we need a deamon thread. It will check for orders in the queue, and then grab available cooks and give them orders.

We're going to need a method that determines whether a cook is busy.
1. In the Cook class, create a boolean busy field with a getter.
2. At the beginning of the startCookingOrder method, set busy to true; and at the end of the method, set it to false.
3. In the startCookingOrder method, simulate the delay resulting from preparing a dish: sleep for 10 times the order's required preparation time. In other words, if an order takes 30 minutes to prepare, then the delay will be 30 * 10 milliseconds.
4. To get a list of all the cooks, in the StatisticsManager class, add a getter for the field that is populated in the register(Cook cook) method.
5. In the OrderManager constructor, create and run a daemon thread. Here's the logic of the run method:
check the queue every 10 milliseconds. If the queue has orders, then look for available cooks and pass them the orders (startCookingOrder method). If there are no available cooks or there are no orders in the queue, then keep waiting.

Requirements:

A boolean busy field and corresponding getter must be created in the Cook class.
The daemon thread described in the task conditions must be created and started in the OrderManager class constructor.
In the startCookingOrder method, the Thread.sleep() method must be called with an argument equal to ten times the order's required preparation time.

package com.codegym.task.task27.task2712; import com.codegym.task.task27.task2712.kitchen.Cook; import com.codegym.task.task27.task2712.kitchen.Order; import com.codegym.task.task27.task2712.kitchen.Waiter; import com.codegym.task.task27.task2712.statistics.StatisticsManager; import java.io.IOException; import java.util.ArrayList; import java.util.List; public class Restaurant { private static final int ORDER_CREATION_INTERVAL = 100; public static void main(String[] args) throws IOException { Cook cookAmigo = new Cook("Amigo"); cookAmigo.addObserver(new Waiter()); Cook cookDiego = new Cook("Diego"); cookDiego.addObserver(new Waiter()); StatisticsManager statisticsManager = StatisticsManager.getInstance(); statisticsManager.register(cookAmigo); statisticsManager.register(cookDiego); OrderManager orderManager = new OrderManager(); List<Tablet> tablets = new ArrayList<>(); for (int i = 0; i < 5; i++) { Tablet tablet = new Tablet(i); tablets.add(tablet); tablet.addObserver(orderManager); } Thread t = new Thread(new RandomOrderGeneratorTask(tablets, ORDER_CREATION_INTERVAL)); t.start(); try { Thread.sleep(1000); } catch (InterruptedException e) { //e.printStackTrace(); } t.interrupt(); // ManagerTablet managerTablet = new ManagerTablet(); // managerTablet.printAdRevenue(); // managerTablet.printCookUtilization(); // managerTablet.printActiveVideoSet(); // managerTablet.printArchivedVideoSet(); } }

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Roman

Level 41

9 July 2020, 15:24

solution

In the initDishes() method of the TestOrder class : 1. You should initialize dishes. 2. "(int) Math.random()" always equals 0.

int dishCount = (int) Math.random() * Dish.values().length + 1;
...
int dishIndex = (int) Math.random() * Dish.values().length;

Vesa

Level 41 , Kaliningrad, Russia

9 July 2020, 15:52

Thank you very much!