Dive to clean architecture with golang

Transcript

1. Dive to clean architecture with golang @bmf_san @Makuake LT Party

   2019/07/03

2. @bmf_san bmf-san bmf-tech.com Twitter Github Blog

3. Golang × Clean Architecture

4. Table of contents • What is the clean architecture? •

   Implementation of clean architecture • Conclusions

5. 1 What is the clean architecture?

6. Ideas for architecture of systems • Over the last several

   years… • Hexagonal Architecture (Ports and Adapters) • Onion Architecture • Screaming Architecture • DCI • BCE • etc…

7. The separation of concerns

8. Things that are produced by those architecture of systems is

   … • Independent of Frameworks • Testable • Independent of UI • Independent of Database • Independent of any external agency • →For eliminating dependencies and getting testability.

9. Clean architecture

10. Layers 4PVSDF
    IUUQTCMPHDMFBODPEFSDPNVODMFCPCUIFDMFBOBSDIJUFDUVSFIUNM

11. Entities • Entities encapsulate the most important business rules •

    ex. an object with methods, a set of data structures and functions…

12. Use Cases • Use cases contains application specific business rules

13. Interface Adapters • Interface adapters is a set of adapters

    which convert data for entities and use cases

14. Frameworks and Drivers • Frameworks and drivers contains frameworkss and

    tools such as the database, web framework, etc

15. The rules of layers • Not only four layers, we

    can change numbers of layers • An inner layer can’t know about an outer layers • The dependency direction is from an outer layer to an inner layer

16. 2 Implementation of clean architecture

17. Repository • Github • bmf-san/go-clean-architecture-web-application- boilerplate • https://github.com/bmf-san/go-clean-architecture-web- application-boilerplate

18. I’m waiting for your nice review.

19. Directory structures -BZFST %JSFDUPSZ 'SBNFXPSLT
    
 BOE
    
 %SJWFST JOGSBTUSVDUVSF *OUFSGBDF JOUFSGBDFT

    6TF
    $BTFT VTFDBTFT &OUJUJFT EPNBJO

20. DIP • Dependency Inversion Principle • One of the SOLID

    principles • Modules should depend on abstractions(e.g. interfaces) • Abstractions should not depend on details(e.g. concrete implementations) • For increasing loosely coupled between high level modules and low level modules • Modules will be more flexible

21. Accept interfaces, return structs

22. None

23. DIP in golang

24. Before

25. After

26. What changed? 42-)BOEMFS 'PP3FQPTJUPSZ
    #FGPSF "GUFS 42-)BOEMFS 'PP3FQPTJUPSZ
    42-)BOEMFS
    *OUFSGBDF

27. Example

28. Example JOGSBTUSVDUVSFTRM)BOEMFSHP *OUFSGBDF
    JOUFSGBDFTTRM)BOEMFSHP JOUFSGBDFTVTFS@SFQPTJUPSZHP *OGSBTUSVDUVSF *OUFSGBDFT

29. Code reading • See the direction of dependency NBJOHP SPVUFSHP

    VTFS@DPOUSPMMFSHP
    VTFS@JOUFSBDUPSHP
    VTFS@SFQPTJUPSZHP
    VTFSHP
    ˣ ˣ ˣ ˣ ˣ *OGSBTUSVDUVSF *OUFSGBDFT 6TF
    $BTFT %PNBJO

30. 3 Conclusions

31. Conclusions • Architect should have leadership for handling clean architecture

    • handson, study session for understanding architecture …etc • There are different ways to interpret it • To expand knowledge for it together as a team • There are various patterns for transactions • A framework is just a tool, not a way of life. • Written on the page p.197 Clean Architecture ୡਓʹֶͿιϑτ΢ΣΞͷߏ଄ͱઃܭ

32. References - Github • Github • manuelkiessling/go-cleanarchitecture • https://github.com/manuelkiessling/go-cleanarchitecture •

    rymccue/golang-standard-lib-rest-api • https://github.com/rymccue/golang-standard-lib-rest-api • hirotakan/go-cleanarchitecture-sample • https://github.com/hirotakan/go-cleanarchitecture-sample

33. References - Blog • Blog • The Clean Code Blog

    • https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html • Recruit Technologies - GoݴޠͱDependency Injection • https://recruit-tech.co.jp/blog/2017/12/11/go_dependency_injection/ • Clean ArchitectureͰAPI ServerΛߏஙͯ͠ΈΔ • https://qiita.com/hirotakan/items/698c1f5773a3cca6193e • ΫϦʔϯΞʔΩςΫνϟͷॻ੶ΛಡΜͩͷͰAPIαʔόΛ࣮૷ͯ͠Έͨ • https://qiita.com/yoshinori_hisakawa/items/f934178d4bd476c8da32 • Go × Clean Architectureͷαϯϓϧ࣮૷ • http://nakawatch.hatenablog.com/entry/2018/07/11/181453

34. References - Books and Papers • Books • Clean Architecture

    ୡਓʹֶͿιϑτ΢ΣΞͷߏ଄ͱઃ ܭ • Papers • The Dependency Inversion Principle • https://web.archive.org/web/20110714224327/http:// www.objectmentor.com/resources/articles/dip.pdf

35. Thank you !