Object Oriented Programming Ch3 SRP, DIP, ISP
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The document discusses core principles of object-oriented programming (OOP) in Swift, focusing on the S.O.L.I.D principles: Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. It emphasizes concepts such as cohesion and coupling, explaining the importance of high cohesion and low coupling in software design. The document includes examples and references for further reading on these OOP principles.
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- 1. Object Oriented Programming in Swift Ch 3 Single Responsibility Principle Dependency Inversion Principle Interface Segregation Principle Sai Li @ Yowoo Tech. 2016/1/9
- 2. References • Agile Software Development: Principles, Patterns, and Practice ( : ) by Robert C. Martin • Fundamental Object Oriented Programming by Hsuan-Tien Lin • by Teddy Chen • Essential Object-Oriented Programming by Josh Ko
- 4. Cohesion • Degree to which the elements of a module belong together • The force that cause a module or a class to change
- 5. Coupling • Degree of interdependence between software modules
- 7. Cohesion & Coupling Goal: high cohesion, low coupling
- 8. S.O.L.I.D • SRP: Single Responsibility Principle • OCP: Open Closed Principle • LSP: Liskov Substitution Principle • ISP: Interface Segregation Principle • DIP: Dependency Inversion Principle
- 9. Single Responsibility Principle “A class should have one, and only one, reason to change.”
- 10. SRP
- 11. SRP
- 12. Responsibility • A reason for change • More than one responsibility • coupled responsibilities • Fragile Design
- 13. Example
- 15. Persistence TDD
- 16. Single Responsibility Principle • One of the simplest and hardest principle • Software Design: The art of separating responsibility
- 17. S.O.L.I.D • SRP: Single Responsibility Principle • OCP: Open Closed Principle • LSP: Liskov Substitution Principle • ISP: Interface Segregation Principle • DIP: Dependency Inversion Principle
- 18. Dependency Inversion Principle 1. High-level modules should not depend on low- level modules. Both should depend on abstractions 2. Abstractions should not depend on details. Details should depend on abstractions.
- 19. Inversion of Control low level change -> high level change
- 20. Hollywood Principle: Don’t call me, I’ll call you Inversion of Control What they need
- 23. – Robert C. Martin “Depend on abstractions, not on concretions.”
- 24. - Design Pattern , GoF “Program to an interface, not an implementation.”
- 25. S.O.L.I.D • SRP: Single Responsibility Principle • OCP: Open Closed Principle • LSP: Liskov Substitution Principle • ISP: Interface Segregation Principle • DIP: Dependency Inversion Principle
- 28. Adaptor
- 29. Interface Segregation Principle “Client should NOT be forced to depend upon interfaces that they do not use”
- 30. Glass door Separate Clients == Separate Interfaces
- 33. “Fat” Interface • More than one responsibility • Coupled responsibilities • Fragile Design • Clients depend on what they need only
- 34. Recap • SRP: A class should have one, and only one, reason to change. • DIP: Depend on abstractions, not on concretions. • ISP: Make fine grained interfaces that are client specific
- 36. Liskov Substitution Principle Subtypes must be substitutable for their base types.
- 37. Rectangle & Square Problem
- 39. Segment Line Ray
- 40. Line: isOn(point: Intercept) == true LineSegment: isOn(point: Intercept) == ?
- 43. It’s the end of the beginning
- 44. – Sai Li “Live for interfaces, not implementations, except Lovers”
- 45. References • https://en.wikipedia.org/wiki/Cohesion_(computer_science) • https://drive.google.com/file/d/0ByOwmqah_nuGNHEtcU5OekdDMkk/view?pli=1 • http://teddy-chen-tw.blogspot.tw/2011/12/1.html • http://www.cs.utexas.edu/users/downing/papers/DIP.1996.pdf • http://howard-lyrics.blogspot.tw/2011/04/test.html • http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod • https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Laptop-hard-drive-exposed.jpg/220px-Laptop-hard-drive- exposed.jpg • http://sce2.umkc.edu/BIT/burrise/pl/design/cohesion-coupling-abstract.gif • http://freefeast.info/wp-content/uploads//2013/08/cohesion-vs.-coupling.jpg • http://cdn.mos.cms.futurecdn.net/7047e9b7bfca2b3b6f352495885e77c2.jpg • https://upload.wikimedia.org/wikipedia/commons/8/8d/DIPLayersPattern.png • http://flylib.com/books/4/444/1/html/2/images/11_3.jpg • http://flylib.com/books/4/444/1/html/2/images/11_4.jpg • http://stg-tud.github.io/sedc/Lecture/ws13-14/Images/DIP-RegulatorBase.png • http://stg-tud.github.io/sedc/Lecture/ws13-14/Images/DIP-RegulatorDIPCompliant.png • http://www.coolmath.com/sites/cmat/files/images/03-lines-01.gif • http://flylib.com/books/4/444/1/html/2/images/12_2.jpg • http://flylib.com/books/4/444/1/html/2/images/12_1.jpg