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MVC, MVP, MVVM Tech Talk Daniel Leonardis @HIFILEO https://github.com/HIFILEO @dan.leonardis - Medium

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Goal • MVC • Define, History, Why, Use Cases, Failures • Clean Code • MVP • Define, History, Use Cases, Failures • MVVM • Define, History, Use Cases, Failures

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Different != Wrong

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MVC - Define • Model View Controller

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MVC - History • Trygve Reenskaug • SmallTalk 76 (XEROX) • Real Simple Pattern

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MVC - WHY • Simple Applications - Good! :-) • Separates internal representations from external. • OO - Modularity • OO - Reuse

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MVC - Use Case • https://github.com/HIFILEO/fibonacci/tree/master/app/ src/main/java/com/appsbyleo/fibonacci

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MVC - Failures

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MVC - Failures

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Clean Code

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Clean Code • What do I gain by doing this? • Independent of Frameworks • Testable • Independent of UI • Independent of Database • Independent of any external agency

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Inner Most Circle • Entities • Enterprises wide business rules • Business Rules • Application specific business rules

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Middle Circle • Interface Adapters • Presenters / Views / View Models • Translation layer • Garbage In = Garbage Out

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Outer Circle • The plugins! • Frameworks and tools • The details! • Though shall do no harm

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Cross Boundary • •Flow of control • In Out In • Dependencies point inward = Contradiction • How to resolve = Dependency Inversion Principle

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Clean Code

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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.

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Traditional Layers

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Dependency Inversion

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Dependency Injection • •Achieve Dependency Inversion by using Dependency Injection

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MVP - Define

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MVP - Define

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MVP - Define

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MVP - History

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MVP - Use Case • https://github.com/HIFILEO/MVPExample

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MVP - Failures • Major Reasons (Death of MVP) • Data Binding • Rx • Architectural Components

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MVP - Failures • Android Data Binding • Binding POJOs • Observable Updates

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MVP - Failures • Subscribe? Bind?

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MVP - Failures • Android’s ViewModel

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MVVM - Define

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MVVM - Define

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MVVM - History • Microsoft 2005 • Ken Cooper and Ted Peters • Need • To simplify event-driven programming

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MVVM - Use Cases • https://github.com/HIFILEO/MVVMReactive

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MVVM - Failures Unless you can model your entire system synchronously, a single asynchronous source breaks imperative programming. Jake Wharton - Managing State with Rx

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< > MVVM + RX - Failures

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Reactive Architecture

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