A craftsman’s guide to designing clean architecture

In this talk, Software Craftsman Marcus Biel describes how to design a Clean Architecture

Transcript

1. Marcus Biel, Software Craftsman Virtual Java User Group | 19. April 2018 A craftsman’s guide to designing clean architecture
2. Copyright 2018 Marcus Biel https://cleancodeacademy.com About me Clean Code Evangelist • Founder of Clean Code Academy • Public Speaker • Author • Java Influencer • JCP Member • Clean Code Coach • Java Consultant @MarcusBiel marcus@cleancodeacademy.com
3. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining a Clean Architecture
4. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining a Clean Architecture
5. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining a Clean Architecture
6. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining a Clean Architecture MODULES PACKAGES CLASSES METHODS
7. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining a Clean Architecture Domain Infrastructure HTTPS REST SOAP
8. Copyright 2018 Marcus Biel https://cleancodeacademy.com Foundation of a Clean Architecture ‣ Coupling and Cohesion ‣ Other Building Blocks
9. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining Coupling Tight Coupling Loose Coupling
10. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining Coupling Tight Coupling Loose Coupling
11. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining Coupling Tight Loose
12. Copyright 2018 Marcus Biel https://cleancodeacademy.com Coupling Strength ‣ Distance of the Components ‣ Type of Coupling ‣ Timing of Coupling
13. Copyright 2018 Marcus Biel https://cleancodeacademy.com Distance of the Components MODULES PACKAGES CLASSES METHODS
14. Copyright 2018 Marcus Biel https://cleancodeacademy.com Distance of the Components
15. Copyright 2018 Marcus Biel https://cleancodeacademy.com Distance of the Components
16. Copyright 2018 Marcus Biel https://cleancodeacademy.com Distance of the Components
17. Copyright 2018 Marcus Biel https://cleancodeacademy.com Distance of the Components
18. Copyright 2018 Marcus Biel https://cleancodeacademy.com Type of Coupling
19. Copyright 2018 Marcus Biel https://cleancodeacademy.com Timing of Coupling
20. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining Cohesion Low Cohesion High Cohesion
21. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining Cohesion Low Cohesion High Cohesion
22. Copyright 2018 Marcus Biel https://cleancodeacademy.com Low High Defining Cohesion
23. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining Cohesion GeneralUtils create(Customer) validate(Car) write(Report)
24. Copyright 2018 Marcus Biel https://cleancodeacademy.com Defining Cohesion CustomerService sellTo(Customer) invoice(Customer) help(Customer)
25. Copyright 2018 Marcus Biel https://cleancodeacademy.com help(Customer) invoice(Customer) Defining Cohesion CustomerSales sellTo(Customer) CustomerAccounting CustomerService
26. Copyright 2018 Marcus Biel https://cleancodeacademy.com Cohesion Types ‣ Logical Cohesion ‣ Business Cohesion
27. Copyright 2018 Marcus Biel https://cleancodeacademy.com Cohesion Key Point High Cohesion requires in-depth knowledge of the domain.
28. Copyright 2018 Marcus Biel https://cleancodeacademy.com Foundation of a Clean Architecture ‣ Coupling and Cohesion ‣ Other Building Blocks
29. Copyright 2018 Marcus Biel https://cleancodeacademy.com Other Building Blocks ‣ Encapsulation ‣ Naming ‣ Size
30. Copyright 2018 Marcus Biel https://cleancodeacademy.com Encapsulation technically enforces of how the system should be used Getters and Setters violate encapsulation. Use package private more often! http://bit.ly/EvilGettersAndSetters
31. Copyright 2018 Marcus Biel https://cleancodeacademy.com Other Building Blocks ‣ Encapsulation ‣ Naming ‣ Size
32. Copyright 2018 Marcus Biel https://cleancodeacademy.com Clean Names Key Points Clean names drive high cohesion 
 (Customer, AccountNumber) Use service pattern judiciously Clean names are team work Rename on new insights
33. Copyright 2018 Marcus Biel https://cleancodeacademy.com Other Building Blocks ‣ Encapsulation ‣ Naming ‣ Size
34. Copyright 2018 Marcus Biel https://cleancodeacademy.com Size Key Points MODULES PACKAGES CLASSES METHODS
35. Copyright 2018 Marcus Biel https://cleancodeacademy.com What is Clean Architecture? I would advise students to pay more attention to the fundamental ideas rather than the latest technology. The technology will be out-of-date before they graduate. Fundamental ideas never get out of date. — David L. Parnas “ ”
36. Marcus Biel, Software Craftsman Virtual Java User Group | 19. April 2018 A craftsman’s guide to designing clean architecture