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Applying software design principles in practice
The document emphasizes the importance of applying design principles to create high-quality software, highlighting architectural concepts such as hierarchy, encapsulation, and the open-closed principle. It discusses common design problems and suggests using design patterns such as the strategy and bridge patterns to improve software flexibility and maintainability. The text underscores that adherence to design principles enhances various qualities of software, such as understandability, extensibility, and reliability.
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Applying software design principles in practice
- 1. How to applydesign principles in practice? Ganesh Samarthyam! Consultant, ZineMind LLC! ganesh.samarthyam@zinemind.com
- 2. “Applying design principlesis the key to creating high-quality software!” Architectural principles: ! Axis, symmetry, rhythm, datum, hierarchy, transformation
- 3. Technology changes fast=> FOMO
- 4. Often frustrating todevelop quality software!
- 5. There must bea better way! “Here is Edward Bear, coming downstairs now, bump, bump, bump, on the back of his head, behind Christopher Robin. It is, as far as ... ! It is, as far as he knows, the only way of coming downstairs, but sometimes he feels that there really is another way, if only he could stop bumping for a moment and think of it!” ! - A.A. Milne
- 6.
- 7. Focus on softwaredesign is the key!
- 8. Real scenario #1 Initial design
- 9. Real scenario #1 ❖ How will you refactor such that:! ❖ A specific DES, AES, TDES, … can be “plugged” at runtime?! ❖ Reuse these algorithms in new contexts? ! ❖ Easily add support for new algorithms in Encryption? ! Next change: smelly design
- 10. Time to refactor! Three strikes and you refactor Martin Fowler
- 11. Potential solution #1? Broken hierarchy! Yuck! ! Your solution smells
- 12. Potential solution #2? Algorithms not reusable! Hmm, can be better. ! Better luck next time…
- 13. Potential solution #3? Wow!! What a nice solution :)
- 14. Can you identifythe pattern?
- 15. You’re right: ItsStrategy pattern!
- 16. Real scenario #2 Initial design
- 17. Real scenario #2 How to add support for new content types and/or algorithms? Yuck! ! This design smells
- 18. How about thissolution? Wow!! What a nice solution :)
- 19. Can you identifythe pattern structure?
- 20. You’re right: ItsBridge pattern!
- 21. Wait, what principledid we apply?
- 22. Open Closed Principle(OCP) Software entities should be open for extension, but closed for modification Bertrand Meyer
- 23. Variation Encapsulation Principle(VEP) Encapsulate the concept that varies Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides
- 24. Fundamental principle: Encapsulation The principle of encapsulation advocates separation of concerns and! information hiding through techniques such as hiding implementation! details of abstractions and hiding variations
- 25. Enabling techniques forencapsulation
- 26. Other fundamental principles? Principles* Abstrac/on* Encapsula/on* Modulariza/on* Hierarchy*
- 27. Applying principles inpractice Encapsulation Violating! encapsulation Adherence to ! encapsulation Applying ! encapsulation
- 28. Applying principles inpractice Principle Violating! principles Adherence to ! principles Refactoring Bad design ! (with smells) Good design (with patterns)
- 29. Design determines qualities DESIGN impacts impacts impacts Understandability Changeability Extensibility Reusability Testability Reliability
- 30. “Applying design principlesis the key to creating high-quality software!” Architectural principles: ! Axis, symmetry, rhythm, datum, hierarchy, transformation
- 31. Presentation source Forewordsby Grady Booch and Dr. Stephane Ducasse
- 32. What are yourtakeaways?
- 33. Image/video credits ❖http://en.wikipedia.org/wiki/Fear_of_missing_out! ❖ http://lesliejanemoran.blogspot.in/2010_05_01_archive.html! ❖ http://javra.eu/wp-content/uploads/2013/07/angry_laptop2.jpg! ❖ https://www.youtube.com/watch?v=5R8XHrfJkeg! ❖ http://womenworld.org/image/052013/31/113745161.jpg! ❖ http://www.fantom-xp.com/wallpapers/33/I'm_not_sure.jpg! ❖ https://www.flickr.com/photos/31457017@N00/453784086 ! ❖ https://www.gradtouch.com/uploads/images/question3.jpg! ❖ http://gurujohn.files.wordpress.com/2008/06/bookcover0001.jpg ! ❖ http://upload.wikimedia.org/wikipedia/commons/d/d5/Martin_Fowler_-_Swipe_Conference_2012.jpg! ❖ http://www.codeproject.com/KB/architecture/csdespat_2/dpcs_br.gif ! ❖ http://upload.wikimedia.org/wikipedia/commons/thumb/2/28/Bertrand_Meyer_IMG_2481.jpg/440px- Bertrand_Meyer_IMG_2481.jpg ! ❖ http://takeji-soft.up.n.seesaa.net/takeji-soft/image/GOF-OOPLSA-94-Color-75.jpg?d=a0 ! ❖ https://developer.apple.com/library/ios/documentation/cocoa/Conceptual/OOP_ObjC/Art/watchcalls_35.gif! ❖ http://www.pluspack.com/files/billeder/Newsletter/25/takeaway_bag.png ! ❖ http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2013/03/design.jpg