Schmutzige Hände mit Clean Architecture (JAX 2019)

Was steckt eigentlich hinter den Begriffen "Clean Architecture" oder "Hexagonal Architecture"? Clean ist immer gut, oder? Sollte ich die mir so ans Herz gewachsene Layerarchitektur vergessen und nur noch Clean Architecture anwenden?

Diese Session gibt einen Überblick über die Konzepte und Ziele hinter Uncle Bob’s Clean Architecure und Co. und stellt Möglichkeiten vor, diese in (Java-)Code umzusetzen. Wir werden diskutieren, wann sich eine Clean Architecture lohnt, welche Abkürzungen man einbauen kann, um den Aufwand im Rahmen zu halten, und wann man lieber die Finger davonlassen sollte.

Transcript

1. Schmutzige Hände mit Clean Architecture Tom Hombergs
2. Layers
3. Layers within Verticals
4. Why bother with Architecture?
5. Architecture Goals
6. Architecture Goals
7. Architecture Goals The goal of software architecture is to minimize the lifetime cost of the software
8. So ... What‘s Wrong With Layers?
9. Disclaimer Layers are a solid architecture pattern! But without additional restrictions they are prone to design flaws
10. Database-Driven Design
11. Blurred Boundaries
12. Hard-to-test Shortcuts
13. Hidden Functionality
14. Do Circles Instead!
15. SOLID Principles S O L I D Single Responsibility Principle Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle Dependency Inversion Principle
16. Dependency Inversion Principle SOLID Principles S O L I D Single Responsibility Principle Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle
17. Dependency Inversion Principle
18. Dependency Inversion Principle We can choose the direction of any code dependency* * As long as we have control over the code
19. Clean Architecture (Robert C. Martin)
20. Single Responsibility Principle Dependency Inversion Principle SOLID Principles S O L I D Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle
21. Single Responsibility Principle
22. Single Responsibility Principle A module* should have only one reason to change * Read: class, package, component, architecture element, software entity, …
23. Single Responsibility Principle – Macro Level
24. Single Responsibility Principle – Macro Level
25. Domain-Driven Design Only a Domain-Centric Architecture allows Domain-Driven Design
26. Single Responsibility Principle – Micro Level
27. Single Responsibility Principle – Micro Level
28. Do Hexagons Instead!
29. Hexagonal Architecture / Ports & Adapters (Alistair Cockburn)
30. Choose your Polygonal Style
31. Use Cases in a Hexagonal Architecture
32. Quiz: What does this Application do?
33. Quiz: What does this Application do?
34. Let‘s Get Our Hands Dirty!
35. Implementing a Use Case https://github.com/thombergs/clean-architecture-example
36. Implementing a Persistence Adapter with Spring Boot https://github.com/thombergs/clean-architecture-example
37. Implementing a Web Adapter with Spring Boot https://github.com/thombergs/clean-architecture-example
38. Mapping Strategies
39. Mapping Strategies – Two Way Mapping
40. Mapping Strategies – No Mapping
41. Mapping Strategies – Full Mapping
42. Mapping Strategies – Mix & Match!
43. Enforcing the Architecture
44. Enforcing the Architecture - Separate Build Artifacts
45. Enforcing the Architecture - ArchUnit @Test void validateRegistrationContextArchitecture() { HexagonalArchitecture .boundedContext("io.reflectoring.copyeditor.registration") .withDomain("domain") .withAdapters("adapter") .incoming("in.web") .outgoing("out.persistence") .and() .withApplicationLayer("application") .services("book") .services("invitation") .incomingPorts("port.in") .outgoingPorts("port.out") .and() .withConfiguration("configuration") .check(allClasses()); }
46. Enforcing the Architecture - Java Module System Yes, it will probably work … … but I'm used to having 5 years of time to learn each new Java version.
47. Conclusion
48. Benefits of a Domain-Centric Architecture
49. Drawbacks of a Domain-Centric Architecture
50. Get the e-book for free! https://geni.us/dirty-hands-jax2019 Subscribe my Blog at https://reflectoring.io Thanks for your Patience!