Behavioral Design Patterns in C++ - Logging System - I

The lecture introduces a project to demonstrate the chain of responsibility pattern. It begins with setting up a project and adding a class to manage application state. A file logger is implemented to log application events. For sensitive events, database logging is added. However, this approach violates design principles like the Open-Closed Principle and Dependency Inversion Principle. The lecture concludes with a plan to refactor the design by introducing a common base class for loggers, aiming to decouple the Winapp class from specific loggers.

What is the primary focus of the lecture?

• Creating a new user interface

• Applying the chain of responsibility pattern

• Developing a mobile application

• Implementing a new database system

What is the purpose of the FileLogger class?

• To handle user authentication

• To log activities to a file

• To display messages on the screen

• To manage user sessions

Why is there a need to log certain events to a database?

• To enhance user interface design

• To improve application performance

• To track user activities involving sensitive data

• To reduce file storage usage

What principle is violated by modifying existing code for new loggers?

• Open/Closed Principle

• Single Responsibility Principle

• Liskov Substitution Principle

• Interface Segregation Principle

What is the issue with Winapp being tightly coupled with specific loggers?

• It increases the application's memory usage

• It violates the Dependency Inversion Principle

• It complicates the user interface

• It makes the application slower

What is the proposed solution to address the design issues?

• Introducing a new user interface

• Switching to a different programming language

• Removing all logging functionalities

• Creating a common base class for loggers

What will the new base class contain?

• A method to manage user sessions

• A pure virtual function for logging

• A function to display logs on the screen

• A method to encrypt log messages