SOLID Principles of Object Oriented Design

 

 

The Single Responsibility Principle

 

 

 

 

 

 

 

 

 

 

 

 

 

DEMO:  The Problem

 

In this class diagram, Rectangle class depends on GUI library package.  Same way Graphical Application and Geometry Service are using Rectangle Class.  If anything changes on GUI  will affect the Rectangle class, hence it should be compiled likewise Geometry services and Graphical Application should be compiled.

 

 

 

 

The problem in Business Implementation

 

 

 

 

 

 

Problem Analysis

 

 

 

Refactoring Better Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Open / Closed Principle

 

 

 

 

 

 

 

 

 

 

 

 

 

DEMO:  The Problem

 

 

 

 

 

 

The problem Analysis

 

 

 

 

 

 

 

Refactoring to a Better Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Adding New rule easily

 

 

 

 

 

 

 

 

 

 

 

 

The Liskov Substitution Principle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Demo: The Problem

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refactoring to a Better Design

 

 

 

 

 

 

 

 

 

 

 

 

The Interface Segregation Principle

 

 

 

 

 

 

 

 

 

 

DEMO:  The problem

 

Problem 1:

 

 

 

Note:  In order to use Validate method inside of membership provider, we need to implement all other abstract base members which we do not use.

 

 

Problem 2:

 

 

 

 

 

 

 

 

 

 

 

Problem Analysis

 

 

 

 

 

 

Refactoring to a Better Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Design Smells and Tips

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Dependency Inversion Principle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DEMO:The Problem

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refactoring to a Better Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Design Smells

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Dependency Inversion Principle, Part 2

 

 

 

 

 

 

 

 

 

 

 

 

 

Traditional Programming

 

 

 

 

 

Refactoring Class Dependencies

 

First step is need to change the Static method to Instance method.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Don't Repeat Yourself Principle, Part 1

 

 

 

 

 

 

 

 

 

 

Demo App and Analysis

 

 

 

 

 

 

 

 

 

 

 

 

 

Refactor Magic Strings

 

 

 

Refactoring Connection String

 

 

 

 

 

 

 

 

 

Refactoring Print Statements

 

 

 

 

 

 

Refactoring Magic Numbers

 

 

 

 

 

Refactoring Format Strings

 

 

 

 

 

 

Refactoring Duplicate Logic

 

 

 

 

 

 

 

 

Refactoring Repeated If-then Logic

 

 

 

 

 

 

 

 

 

Refactoring Conditional Polymorphism

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Don't Repeat Yourself Principle, Part 2

 

 

 

 

 

 

 

Test and Static Cling

 

 

 

 

 

 

 

Demo of Adding Integration Tests

 

 

 

 

 

Demo of Adding Unit Tests

 

 

 

 

 

 

 

 

 

 

 

Demo of MOCK Objects

 

 

 

 

 

 

 

 

 

 

Principles of Object Oriented Design - The Don't Repeat Yourself Principle, Part 3

 

 

 

 

Repeated Execution Pattern

 

 

 

Demo of Refactoring using Action of T

 

 

 

 

 

 

 

 

 

Demo of Refactor Data Access

 

 

 

 

 

 

 

 

 

Demo:  Find Duplicate Code – Atomiq

 

 

 

 

 

Code Generation

 

 

 

Repetition in process

 

 

 

 

Demo of Automation with MS Build

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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