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Restaurant (part 21)

Java Multithreading, Level 9, Lesson 15

Under discussion

I think I did very well, but I can't go through the validation. Someone help please!

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.util.ArrayList; import java.util.List; import java.util.concurrent.LinkedBlockingQueue; public class Restaurant { private static final int ORDER_CREATION_INTERVAL = 100; public static void main(String[] args) { //Tablet tablet = new Tablet(5); Cook cook = new Cook("Amigo"); Cook cook1 = new Cook("Banana"); StatisticsManager.getInstance().register(cook); StatisticsManager.getInstance().register(cook1); //Waiter waiter = new Waiter(); //tablet.addObserver(cook); //cook.addObserver(waiter); //tablet.createOrder(); List<Tablet> tablets = new ArrayList<>(); for (int i = 1; i < 6; i++) { tablets.add(new Tablet(i)); } for (Tablet tablet : tablets) { tablet.addObserver(new OrderManager()); } Thread thread = new Thread(new RandomOrderGeneratorTask(tablets, ORDER_CREATION_INTERVAL)); thread.start(); try{ Thread.sleep(1000); thread.interrupt(); thread.join(); Thread.sleep(1000); }catch (InterruptedException e){} ManagerTablet manager = new ManagerTablet(); manager.printAdRevenue(); manager.printCookUtilization(); manager.printActiveVideoSet(); manager.printArchivedVideoSet(); } }

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John Squirrels Website Admin at CodeGym

9 June 2023, 11:56

In the ConsoleHelper class, there should be a field called BufferedReader (as required in the second part of the task): create a ConsoleHelper class with a single BufferedReader, through which we will work with the console.