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The OO Design Principles

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Steve Zhang
Steve Zhang

The document discusses several object-oriented (OO) design principles including the single responsibility principle (SRP), open-closed principle (OCP), Liskov substitution principle (LSP), interface segregation principle (ISP), and dependency inversion principle (DIP). It also discusses design patterns, refactoring, and design by contract (DBC) as ways to prevent software decay over time and improve design quality. The key OO principles guide developers to create flexible, maintainable and reusable software designs.

Technology
1 of 53
The OO Design Principles Steve Zhang
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The presentation comes from two books Author: Robert C. Martin Nick Name: Uncle Bob Agile Software Development, principles, patterns and practices
The pragmatic Programmer – from journeyman to master Andy Hunt Dave Thomas
What is Software Design? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Software nature – Software entropy ,[object Object],[object Object]
The cost of change curve
Developers productivity vs. time Question: does our project manager consider this curve when doing estimations?
Design Smells – The Odors of Rotting Software ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Rigidity ,[object Object],[object Object],[object Object]
Fragility ,[object Object],[object Object],[object Object]
Immobility ,[object Object],[object Object],[object Object]
Viscosity ,[object Object],[object Object],[object Object]
Needless complexity ,[object Object],[object Object],[object Object],[object Object]
Needless Repetition ,[object Object],[object Object],[object Object],Duplication is Evil! DRY – DON’T REPEAT YOURSELF
Opacity ,[object Object],[object Object],[object Object]
What Stimulates the Software to Rot? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The psychology reason – Broken Window Theory ,[object Object],[object Object],[object Object],[object Object],From the book Pragmatic Programmer – From Journeyman to Master
How can we prevent software from rotting? ,[object Object],[object Object],[object Object],[object Object],[object Object]
 
 
S.O.L.I.D Design Principles ,[object Object],[object Object],[object Object],[object Object],[object Object]
SRP: The Single-Responsibility Principle ,[object Object],[object Object],[object Object]
OCP: The Open-Closed Principle ,[object Object],[object Object],[object Object],[object Object],[object Object]
OCP – Abstraction is the key Example: Strategy pattern Client is both open and closed
OCP Summary ,[object Object],[object Object]
Further thinking of OCP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
LSP: Liskov Substitution Principle ,[object Object],[object Object],[object Object]
LSP violation example: A violation of LSP causing a violation of OCP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Violate OCP Not substitutable
Another LSP violation example: Rectangle and Square ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Square’s behavior is changed, so it is not substitutable to Rectangle IS-A Relationship Square is not Rectangle!
LSP is closely related to Design By Contract methodology ,[object Object],[object Object],[object Object]
DIP: The Dependency Inversion Principle ,[object Object],[object Object],[object Object]
A DIP example DIP violation DIP
DIP: an inversion of ownership ,[object Object],[object Object],[object Object]
DIP: Depend on Abstractions ,[object Object],[object Object],[object Object]
DIP is also regarded as Dependency Injection & Inversion of Control ,[object Object]
DIP Summary ,[object Object],[object Object],[object Object]
ISP: The Interface Segregation Principle ,[object Object],[object Object],[object Object],[object Object],[object Object]
An violation of ISP example ISP violation
An ISP Violation example: solution Segregated interface
LoD - Law of Demeter ,[object Object],[object Object],[object Object],[object Object],[object Object]
LoD formal definition ,[object Object],[object Object],[object Object],[object Object],[object Object]
LoD
LoD violation example ,[object Object],[object Object],[object Object],[object Object]
DRY – Don’t Repeat Yourself ,[object Object],[object Object],[object Object],Originated from the book – The pragmatic programmer
How can we prevent duplication? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DBC - Design By Contract ,[object Object],[object Object],[object Object],[object Object]
Design By Contract Definition ,[object Object],[object Object]
DBC ,[object Object],[object Object],[object Object],[object Object],[object Object]
Summary ,[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Your feedback is very important!
Thank You!

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