One weird trick that will make your development life easier forever

Talk Held at the Cocoaheads Berlin October 2015 Meeting

Code at https://github.com/zalando/ModularDemo

Transcript

1. One weird trick that will make your development life easier forever Product owners hate him. 1 — © Zalando SE, 2015
2. Modularize Your Application 2 — © Zalando SE, 2015
3. Thank You! Questions? 3 — © Zalando SE, 2015
4. Case Study Sample App: Show Me the Code 4 — © Zalando SE, 2015
5. Building Blocks, Part 1 → The Dependency Inversion Principle1 1 Robert C. Martin ‘96, objectmentor.com/resources/articles/dip.pdf 5 — © Zalando SE, 2015
6. The Dependency Inversion Principle High level modules should not depend upon low level modules. Both should depend upon abstractions.2 2 Abstractions: Interfaces, Protocols 6 — © Zalando SE, 2015
7. The Dependency Inversion Principle Abstractions should not depend upon details.3 Details should depend upon abstractions. 3 Details: Implementation details 7 — © Zalando SE, 2015
8. Building Blocks, Part 2 → Inversion of Control4 4 Martin Fowler ‘04, martinfowler.com/articles/injection.html 8 — © Zalando SE, 2015
9. Inversion of Control Just Declare Static Dependencies, Leave Object Graph Composition to the Framework 9 — © Zalando SE, 2015
10. Case Study We use a Service Locator as an IoC container → But Address the Common Problems of a Service Locator 10 — © Zalando SE, 2015
11. Case Study Sample App: Will It Compose? 11 — © Zalando SE, 2015
12. Inversion of Control → No Need for Mocking → Decorators for AOP-Style Cross-Cutting Concerns → Configuration Changes in Deployed Apps → Feature Flags 12 — © Zalando SE, 2015
13. Case Study Sample App: Decorate Me. 13 — © Zalando SE, 2015
14. Is It Any Good? Yes! 14 — © Zalando SE, 2015
15. Is It Any Good? Yes. Proven: Used Over the Last Two Years First Application: Monolithic Objective-C Legacy App 15 — © Zalando SE, 2015
16. Is It Any Good? Yes. Makes Development Fast, Modules Testable Plays Well with Continuous Integration 16 — © Zalando SE, 2015
17. Hipster service In object-oriented programming, the use of interfaces as an architectural pattern to construct modules is known as protocol-oriented programming. 17 — © Zalando SE, 2015
18. Hipster service Microservices is a software architecture style in which complex applications are composed of small, independent modules communicating with each other. These services are small, highly decoupled and focus on doing a small task, facilitating a modular approach to system-building. 18 — © Zalando SE, 2015
19. Hipster service API-First Design… 19 — © Zalando SE, 2015
20. Thank You! Questions?5 5 Even though “Déjà Vu” is French for “already seen”, it actually is used to describe the strange feeling you get when you're in a situation, and feel like you've been in the exact same situation before, but really haven't. 20 — © Zalando SE, 2015