Get Your Hands Dirty on Clean Architecture (Java Talks 12/2019)

An introduction to Robert C. Martin's Clean Architecture and Alistair Cockburn's Hexagonal Architecture with a link to an opinionated hexagonal coding style.

Transcript

1. @TomHombergs https://reflectoring.io Get Your Hands Dirty on Clean Architecture
3. @TomHombergs https://reflectoring.io Layers
4. @TomHombergs https://reflectoring.io Why bother with architecture?
5. @TomHombergs https://reflectoring.io Architecture Goals
6. @TomHombergs https://reflectoring.io Architecture Goals
7. @TomHombergs https://reflectoring.io The Ultimate Goal of Architecture The goal of software architecture is to minimize the lifetime cost of the software
8. @TomHombergs https://reflectoring.io So ... what‘s wrong with layers?
9. @TomHombergs https://reflectoring.io Disclaimer Layers are a solid 
 architecture pattern! But without additional restrictions they tend to erode
10. @TomHombergs https://reflectoring.io Layers Promote Database-Driven Design
11. @TomHombergs https://reflectoring.io Layers Promote Hard-to-test Shortcuts
12. @TomHombergs https://reflectoring.io Layers Promote Hidden Functionality
13. @TomHombergs https://reflectoring.io Do circles instead!
14. @TomHombergs https://reflectoring.io SOLID Principles S O L I D Single Responsibility Principle Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle Dependency Inversion Principle
15. @TomHombergs https://reflectoring.io Dependency Inversion Principle SOLID Principles S O L I D Single Responsibility Principle Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle
16. @TomHombergs https://reflectoring.io Dependency Inversion Principle
17. @TomHombergs https://reflectoring.io Dependency Inversion Principle We can choose the direction of any code dependency* * As long as we have control over the code
18. @TomHombergs https://reflectoring.io Clean Architecture (Robert C. Martin)
19. @TomHombergs https://reflectoring.io Single Responsibility Principle Dependency Inversion Principle SOLID Principles S O L I D Open-Closed Principle Liskov Substitution Principle Interface Segregation Principle
20. @TomHombergs https://reflectoring.io Single Responsibility Principle
21. @TomHombergs https://reflectoring.io Single Responsibility Principle A module* should have only one reason to change * or class, package, component, architecture element, software entity, …
22. @TomHombergs https://reflectoring.io Single Responsibility Principle – Micro Level
23. @TomHombergs https://reflectoring.io Single Responsibility Principle – Micro Level
24. @TomHombergs https://reflectoring.io Single Responsibility Principle – Macro Level
25. @TomHombergs https://reflectoring.io Single Responsibility Principle – Macro Level
26. @TomHombergs https://reflectoring.io Domain-Driven Design Only a domain-centric architecture allows Domain-Driven Design
27. @TomHombergs https://reflectoring.io Or do hexagons instead!
28. @TomHombergs https://reflectoring.io Hexagonal Architecture / Ports & Adapters (Alistair Cockburn)
29. @TomHombergs https://reflectoring.io Choose your Polygonal Style
30. @TomHombergs https://reflectoring.io Quiz: What does this Application do?
31. @TomHombergs https://reflectoring.io Quiz: What does this Application do?
32. @TomHombergs https://reflectoring.io Let‘s get our hands dirty! Code Example: https://github.com/thombergs/buckpal
33. @TomHombergs https://reflectoring.io Conclusion
34. @TomHombergs https://reflectoring.io Benefits of a Domain-Centric Architecture
35. @TomHombergs https://reflectoring.io Drawbacks of a Domain-Centric Architecture
36. @TomHombergs https://reflectoring.io Thank you for your Patience …if you promise to post a review on Amazon :) https://speakerdeck.com/thombergs/2019 Slides! https://reflectoring.io/javatalks Free ebook! Pretty Book Covers!