GDG Ternopil - Mobile Applications Architecture

Transcript

1. Mobile Applications Architecture Modern and eternal ways ;) Royce Mars Tech Lead @ DataArt
2. Software Architecture The Origins
3. #mobarchclub Why Use Architecture? • 10:1 reading to writing ratio
4. #mobarchclub Why Use Architecture? • 10:1 reading to writing ratio
5. #mobarchclub Why Use Architecture? • Isolate complex or frequently changing code
6. #mobarchclub Why Use Architecture? • Black box complex areas
7. #mobarchclub Why Use Architecture? • Avoid bugs
8. #mobarchclub Why Not Use Architecture? • Costs and benefits of scalability
9. #mobarchclub Why Not Use Architecture? • No architecture for architecture’s sake
10. #mobarchclub Why Not Use Architecture? • Trade-o between speed and technical debt
11. #mobarchclub Why Not Use Architecture? • Spectrum of e ort
12. Main Principles Of a good architecture
13. #mobarchclub
14. #mobarchclub KISS = Seep It Simple Stupid
15. #mobarchclub DRY = Don’t Repeat Yourself
16. #mobarchclub YAGNI = You Aren’t Going to Need It!
17. #mobarchclub SRP = Single Responsibility Principle
18. #mobarchclub OCP - Open Closed Principle
19. #mobarchclub LSP - Liskov Substitution Principle
20. #mobarchclub ISP - Interface Segregation Principle
21. #mobarchclub DIP - Dependency Inversion Principle
22. #mobarchclub
23. #mobarchclub Clean Architecture image from https://8thlight.com
24. Mobile Applications Architecture Some specifics. Main complexity levels
25. #mobarchclub Android Has “Good Bones” image from https://8thlight.com Components: -Activities -Fragments -Services -Content Providers -Broadcast Receivers
26. #mobarchclub Mobile has it’s Specifics image from https://8thlight.com App-hopping OS may kill app at random time App components lifecycle is not under control Components should not depend on each other Can’t rely on data, stored in components
27. #mobarchclub Android Activity Lifecycle is like this :) image from https://8thlight.com
28. #mobarchclub Common Principles for Mobile -Separation of concerns -Provide solid user experience -Keep UI lean and simple -Keep UI free of app logic -Drive UI from model -Use persistent model -Assign clear responsibilities model classes
29. #mobarchclub Separation of Concerns. Abstract way image from fernandocejas.com
30. #mobarchclub Levels of Complexity of Android App Architecture 1. L1 - Presenter / ViewModel, Layer Separation, Entities 2. Injection 3. Coordinator 4. Reactive Programming (Rx)
31. #mobarchclub Presenter / View Model Move non-UI logic from controller to another class
32. #mobarchclub Layer Separation Move network, database and business logic to separate layers
33. #mobarchclub Entities Separate view from database. Little or no logic for entities
34. #mobarchclub Dependency injection Decouple layers. Pass dependencies to constructor parameters Or use injection framework (JSR-330, Dagger, AndroidAnnotations, Juice, etc.)
35. #mobarchclub Coordinator Move navigation logic out of views
36. #mobarchclub Reactive Programming Automatically propagate changes between layers and use mapping between data in functional style
37. Mobile Architecture Patterns Common patterns. Not only for Android
38. #mobarchclub MVC: Model - View - Controller
39. #mobarchclub MVP: Model - View - Presenter
40. #mobarchclub MVVM: Model - View - ViewModel
41. #mobarchclub VIPER
42. #mobarchclub RIBs
43. #mobarchclub Architecture Components
44. #mobarchclub Architecture Components image from Guide to App Architecture
45. Project Lifecycle. Agile Architecture Things outside app that influence architecture evolution
46. #mobarchclub Minimum Viable Architecture 1. YAGNI = You aren’t going to need it! 2. RT-RJ-RT Use the Right Tool for the Right Job at the Right Time 3. XP - Change incrementally
47. #mobarchclub Minimum Viable Product
48. #mobarchclub Project (Startup) Lifecycle 1. Search Phase (Discovery, Solution Design, etc.) 2. Execution Phase (Project) 3. Scaling Phase
49. #mobarchclub Search Phase 1. “No architecture at all” 2. Find business model and market fit 3. Acquire first customers 4. Prototype - familiar technology, cobble it together 5. Throw it away later - but not now
50. #mobarchclub Execution Phase 1. “Just enough” architecture 2. Meet near-term customer needs, delight customers 3. Rapid learning and imporovement 4. Team productivity 5. Monolithic architecture 6. Minimal infrastructure 7. NOT about scaling
51. #mobarchclub Change drives the world “The best code you can write now is the code you’ll discard in a couple of years” Martin Fowler
52. #mobarchclub Monolithic Architecture • Presentation - Web (JS), Android, iOS • Application / Backend - Java, PHP, Ruby • Database - Firebase, MySQL, Mongo
53. #mobarchclub Scaling Phase • Scaling the Team • Scaling the Technology • Concurrency and E ciency
54. #mobarchclub Scaling is the result of the change “If you don’t end up regretting your early technology decisions, you probably over-engineered” Randy Shoup
55. #mobarchclub Scaling. “Next-Gen” Architecture • Scaling the Technology. Migrations, Concurrency, Other languages • Scalable persistence. Break-up monolithic DB, split to functional modules • Identify and eliminate bottlenecks. Increase performance • Re-Design interfaces
56. Read Learn and expand
57. #mobarchclub Read About Software Architecture Clean Architecture https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html Architecture, the Lost Years by Uncle Bob https://youtu.be/WpkDN78P884 Fernando Cejas - Architecturing Android, Evolution https://fernandocejas.com/2015/07/18/architecting-android-the-evolution/ Minimum Viable Architecture https://www.slideshare.net/RandyShoup/minimum-viable-architecture-good-e nough-is-good-enough-in-a-startup Mobile Architecture Club
58. #mobarchclub Read About Architectural Frameworks Moxy https://github.com/Arello-Mobile/Moxy Mosby https://github.com/sockeqwe/mosby Android MVP Helper https://github.com/Ufkoku/AndroidMVPHelper Clean Architecture https://github.com/android10/Android-CleanArchitecture Reark https://github.com/reark/reark MVP + Dagger2 + Rx https://android.jlelse.eu/mvp-dagger-2-rx-clean-modern-android-app-code- 74f63c9a6f2f Uber RIBs https://github.com/uber/RIBs
59. #mobarchclub Read About Architecture Components Guide to App Architecture https://developer.android.com/topic/libraries/architecture/guide.html Architecture Components https://developer.android.com/topic/libraries/architecture/index.html I/O ‘17 Architecture Components Introduction - https://youtu.be/FrteWKKVyzI Solving the Lifecycle Problem - https://youtu.be/bEKNi1JOrNs Persistence and O ine - https://youtu.be/MfHsPGQ6bgE Architecture Components on GDD Europe - https://youtu.be/Ts-uxYiBEQ8 GDD Europe CodeLabs g.co/codelabs/gdd17 Google Github samples https://github.com/googlesamples/android-architecture-components
60. @RoyceMars @DataArt Thank you! :) Mobile Architecture Club