A craftsman’s guide to designing clean architecture

Transcript

1. Marcus Biel, Software Craftsman Moscow | 7. 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 Moscow | 7. April 2018 A

    craftsman’s guide to designing clean architecture