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
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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
    
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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
23. DIP in golang
24. Before
25. After
26. What changed? 42-)BOEMFS 'PP3FQPTJUPSZ
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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
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    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 !