MVC-MVP-MVVM

A group of online Udacity students reached out to me to give a presentation about architecture. This was a presentation that quickly, at a high level, covered known architectures. Focus on the android platform although it can be used on any platform.

Transcript

1. MVC, MVP, MVVM Tech Talk Daniel Leonardis @HIFILEO https://github.com/HIFILEO @dan.leonardis - Medium
2. Goal • MVC • Define, History, Why, Use Cases, Failures • Clean Code • MVP • Define, History, Use Cases, Failures • MVVM • Define, History, Use Cases, Failures
3. Different != Wrong
4. MVC - Define • Model View Controller
5. MVC - History • Trygve Reenskaug • SmallTalk 76 (XEROX) • Real Simple Pattern
6. MVC - WHY • Simple Applications - Good! :-) • Separates internal representations from external. • OO - Modularity • OO - Reuse
7. MVC - Use Case • https://github.com/HIFILEO/fibonacci/tree/master/app/ src/main/java/com/appsbyleo/fibonacci
8. MVC - Failures
9. MVC - Failures
10. Clean Code
11. Clean Code • What do I gain by doing this? • Independent of Frameworks • Testable • Independent of UI • Independent of Database • Independent of any external agency
12. Inner Most Circle • Entities • Enterprises wide business rules • Business Rules • Application specific business rules
13. Middle Circle • Interface Adapters • Presenters / Views / View Models • Translation layer • Garbage In = Garbage Out
14. Outer Circle • The plugins! • Frameworks and tools • The details! • Though shall do no harm
15. Cross Boundary • •Flow of control • In Out In • Dependencies point inward = Contradiction • How to resolve = Dependency Inversion Principle
16. Clean Code
17. Dependency Inversion Principle • •Definition • •Rules • 1.) High-level modules should not depend on low-level modules. Both should depend on abstractions. • 2.) Abstraction should not depend on details. Details should depend on abstractions.
18. Traditional Layers
19. Dependency Inversion
21. Dependency Injection • •Achieve Dependency Inversion by using Dependency Injection
22. MVP - Define
23. MVP - Define
24. MVP - Define
25. MVP - History
26. MVP - Use Case • https://github.com/HIFILEO/MVPExample
27. MVP - Failures • Major Reasons (Death of MVP) • Data Binding • Rx • Architectural Components
28. MVP - Failures • Android Data Binding • Binding POJOs • Observable Updates
29. MVP - Failures • Subscribe? Bind?
30. MVP - Failures • Android’s ViewModel
31. MVVM - Define
32. MVVM - Define
33. MVVM - History • Microsoft 2005 • Ken Cooper and Ted Peters • Need • To simplify event-driven programming
34. MVVM - Use Cases • https://github.com/HIFILEO/MVVMReactive
35. MVVM - Failures Unless you can model your entire system synchronously, a single asynchronous source breaks imperative programming. Jake Wharton - Managing State with Rx
36. < > MVVM + RX - Failures
37. Reactive Architecture