You are writing an endpoint that returns the total number of Items bought in your Online store by a given user.

Orders in your system are stored in an external service called OrdersService.

Your task is to:

$.$write an endpoint in the given UsersController class

$.$ write a method in the given UserService class that counts the number of items bought by the given user.

$.$configure the UsersController and UserService classes

Environment

Your application is written with the Spring framework

public class OrderService $\{$

List itemsBought$($String username$)$;

$\}$

Requirements:

$1.$ Make sure that the AppConfiguration class is treated as a Spring configuration bean.

$2.$Configure Spring to Scan for beans in the com.codility.external package.

$3.$prepare the OrdersService bean$($please refer to the signatures decribed above$)$

$.$Inject the OrdersService bean into the ordersService field

$.$Use it in the getNumberOfItemsBought$()$ method count the number of items bought by the given user.

$4.$Inject UserService into UsersController

$5.$Use it in the totalItemsBought$()$ method to fetch the number of items bought by the given user.

$6.$The totalItemsBought$()$ method should implements the following contract

$.$endpoint URL: $/$users$/\{$username$\}/$items$/$total$,$where username is a path variable;

$.$response JSON format:

$\{"$totalItemsBought$"$:number$\},$where number is the number of items bought by the given user,

status code $200$ in case of a successful response

$7.$Make sure you pass the username variable to the totalItemsBought call.

$8.$For simplicity,you don't have write any input validation or error handling

$9.$ you are working with the spring Framework version $5\mathrm{.}1\mathrm{.}7$ and java$8$

$-------$

package com.codility.app;

import org.springframework.context.annotation.$*$;

public class AppConfiguration $\{$

$\}$

$-----$

package com.codility.app;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Collections;

public class UserController $\{$

private UsersService usersService;

public Map totalItemsBought$()$

$\{$return null;$\}\}$

$-------$

package com.codility.app;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Service;

public class UsersService $\{$

private OrderService ordersService;

public int getNumberOfItemsBought$($String username$)$

$\{$return $0$;$\}$

$\}$

$------$

package com.codility.external;

public class OrderService $\{$

List itemsBought$($String username$)$;

$\}$Make sure that the AppConfiguration class is treated

as a Spring configuration bean.

Configure Spring to scan for beans in the

com.codility. external package.

Prepare the OrdersService bean $($please refer to the

signatures described above$)$:

$$ Inject the Ordersservice bean into the

ordersService field.

Use it in the getNumberofItemsBought method to

count the number of items bought by the given user.

Inject UsersService into UsersController.

requireIItIIs