Design Patterns: Refactor a Class to Follow SRP

Problem Statement

A lab to follow the SRP principle while doing your code in C#.

• Do refer to the below UserService class that handles user authentication, user data management, and email notifications.
• Refactor the UserService class into separate classes to handle the different responsibilities.
• Ensure each class has a single responsibility and update the main program to use the new classes: UserService, AuthenticationService, UserDataService, EmailNotificationService.

UserService Class:

using System;
public class UserService
{
    private readonly AuthenticationService _authenticationService;
    private readonly UserDataService _userDataService;
    private readonly EmailNotificationService _emailNotificationService;
    public UserService(AuthenticationService authenticationService, UserDataService userDataService, EmailNotificationService emailNotificationService)
    {
        _authenticationService = authenticationService;
        _userDataService = userDataService;
        _emailNotificationService = emailNotificationService;
    }
    public void ProcessUser(string username, string password, string emailAddress)
    {
        // Authenticate user
        if (_authenticationService.AuthenticateUser(username, password))
        {
            // If authenticated, manage user data
            _userDataService.ManageUserData(username);
            // Send email notification
            string message = "Your account has been accessed.";
            _emailNotificationService.SendNotification(emailAddress, message);
        }
        else
        {
            Console.WriteLine("Authentication failed.");
        }
    }
}

Lab Objective:

Upon completion of this lab, you will be able to:

• Understand and use the Single Responsibility Principle (SRP) in class design.
• Refactor a monolithic class into numerous classes, each with its own responsibility.
• Update and integrate a refactored class structure into an existing program to increase code maintainability and clarity.

Prerequisites

You should install the following software on your machine:

• VS Code or Visual Studio
• .NET SDK