Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility...

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Introduction to SOLID Principles

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Transcript of Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility...

Page 1: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

Introduction to SOLID Principles

Page 2: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

Background

Page 3: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

• Dependency Inversion Principle

• Single Responsibility Principle

• Open/Closed Principle

• Liskov Substitution Principle

• Interface Segregation Principle

Page 4: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

S: Single Responsibility Principle (SRP)

“Every class should have a single responsibility, and that responsibility should be entirely encapsulated by that class”

Page 5: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
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1. When we need to modify the way we save Customer data

2. When we want to revise the way we log our Exceptions

The Customer class has 2 reasons to change:

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Difficulty in naming classes can be a sign that you are trying to do too much, and that this class is taking on too much responsibility

Do One Thing: methods that only do one thing are usually very short: 3-5 lines

Multiple unit tests for the same method should be a warning sign that you are doing too much

SRP - Tips

Page 10: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

O: Open/Closed Principle (OCP)

“Software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification.”

Page 11: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

O: Open/Closed Principle (OCP)

Open for extension – you can extend an object’s behaviour

Closed for modification – without the need to modify any existing code

Page 12: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
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L: Liskov Substitution Principle (LSP)

“If S is a subtype of T, then objects of type T may be replaced with objects of type S without altering any of the desirable properties of that program”

Page 16: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
Page 17: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
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Page 19: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
Page 20: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
Page 21: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

Favour Interfaces over inheritance (Google this…you’ll find loads!)

Use inheritance sparingly.

Keep inheritance hierarchies from getting to big – aim for no more than two or three deep.

LSP - Tips

Page 22: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

I: Interface Segregation Principle (ISP)

“No client should be forced to depend on methods it does not use.”

Page 23: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
Page 24: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
Page 25: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
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Page 27: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
Page 28: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
Page 29: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

D: Dependency Inversion Principle (DIP)

“A. High-level modules should not depend on low-level modules. Both should depend on abstractions.

B. Abstractions should not depend on details. Details should depend on abstractions.”

Page 30: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.
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UnityCastle Windsor

IOC Containers

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Questions

Page 36: Introduction to SOLID Principles. Background Dependency Inversion Principle Single Responsibility Principle Open/Closed Principle Liskov Substitution.

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The Power of Abstraction Barbara Liskov November 2009.

The Power of Abstraction Barbara Liskov November 2009.

Dependency Injection - 101books.ru · 1.3 Embracing dependency injection 13 The Hollywood Principle 13 Inversion of Control vs. dependency injection 15 1.4 Dependency injection in

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1 Single Responsibility Principle Open Closed Principle Liskov Substitution Principle Law of Demeter CSC 335: Object-Oriented Programming and Design.

1 Single Responsibility Principle Open Closed Principle Liskov Substitution Principle Law of Demeter CSC 335: Object-Oriented Programming and Design.

Liskov Substitution Principle (LSP) Dependency-Inversion ...av/courses/5895-current/manual_uploads/principles2_quad.pdf · Liskov Substitution Principle (LSP) Dependency-Inversion

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A Curry of Dependency Inversion Principle (DIP), Inversion of Control (IoC), Dependency Injection (DI) and IoC Container - CodeProject

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Inheritance, substitution, subclasses and subtypespeople.dsv.su.se/~tobias/ioor/l5_IOOR_HT09.pdffrom a supertype is expected. The Liskov substitution principle is a definition of

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Mismatches in default inheritance€¦  · Web viewThe conflict of word order between this dependency and the natural dependency on with is resolved by the Competition Principle

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Design principles...The dependency inversion principle •Depend on abstractions, not on concretions. •The primary mechanism of OO design •No dependency should target a concrete

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Specifications Liskov Chapter 9

Specifications Liskov Chapter 9

Code Like a Ninja Session 4 - Liskov Substitution Principle

Code Like a Ninja Session 4 - Liskov Substitution Principle

Type Abstraction Liskov, Chapter 7. 2 Liskov Substitution Principle In any client code, if the supertype object is substituted by a subtype object, the.

Type Abstraction Liskov, Chapter 7. 2 Liskov Substitution Principle In any client code, if the supertype object is substituted by a subtype object, the.

SFWR ENG 3A04: Software Design II · principle Dependency Inversion Principle Law of Demeter Other Design Principles for Security General Design Principles Principle of Low Coupling

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SOLID Liskov substitution principle Barbara Liskov in a 1987 conference keynote address entitled Data abstraction and hierarchy In a computer program,

SOLID Liskov substitution principle Barbara Liskov in a 1987 conference keynote address entitled Data abstraction and hierarchy In a computer program,

Liskov Substitution Principle · S Single Responsibility Principle (SRP). Classes should have one, and only one, reason to change. Keep your classes small and single-purposed. O Open-Closed

Liskov Substitution Principle · S Single Responsibility Principle (SRP). Classes should have one, and only one, reason to change. Keep your classes small and single-purposed. O Open-Closed

Subtype Polymorphism, Subtyping vs. Subclassing, Liskov Substitution Principle.

Subtype Polymorphism, Subtyping vs. Subclassing, Liskov Substitution Principle.

Aspect-Oriented Programming with Dependency Injectiongotocon.com/dl/...AspectOrientedProgrammingWithDependencyInje… · Objective •Single Responsibility Principle •Open/Closed

Aspect-Oriented Programming with Dependency Injectiongotocon.com/dl/...AspectOrientedProgrammingWithDependencyInje… · Objective •Single Responsibility Principle •Open/Closed

INF5120 – Modellbasert Systemutvikling · Recurrence Teaching (e.g ... The Liskov Substitution Principle ... forward the operation to its children (and/or perform additional work

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Dependency Injection - Eastern Washington Universitypenguin.ewu.edu/cscd454/notes/DependencyInjection.pdf · Applies core principle of separation of behavior from dependency resolution

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Silex and Twig · D - Dependency Inversion Principle. 3. 3-ish. 1.2. 10. 3. Single Responsibility Principle One reason to change. Open / Closed Principle Open for extension Closed

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Liskov Substitution Principle(ELLS §10.5)€¦ · Rails’ ActiveRecord module defines an AbstractAdapter for connecting to databases. Subclasses of AbstractAdapter exist for each

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