Beyond Hexagonal architecture
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The document discusses moving beyond a traditional hexagonal architecture to a more functional architecture. It outlines some benefits of a functional core such as business code without side effects and the ability to separate decisions from actions. The document compares features of hexagonal versus functional architecture and notes they should not be directly compared as they relate to different programming paradigms. It also questions whether the term "beyond hexagonal" accurately reflects incorporating functional concepts. Overall, the document explores options for mixing hexagonal architecture and functional programming principles.
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Beyond Hexagonal architecture
- 1. BEYOND HEXAGONAL ARCHITECTURE Thomas PIERRAIN @tpierrain Bruno BOUCARD @brunoboucard
- 2. OUR DOMAIN La Colline Théâtre National - Les Souffleurs d'Images
- 3. SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 4. SEATS SUGGESTIONS API SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 5. AUDITORIUM SEATING API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 6. AUDITORIUM SEATING API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 7. AUDITORIUM SEATING API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 8. AUDITORIUM SEATING API SEATS AVAILABILITY API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API “I also need to know which seats are already reserved for show Z” SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 9. AUDITORIUM SEATING API SEATS AVAILABILITY API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API “I also need to know which seats are already reserved for show Z” SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 10. AUDITORIUM SEATING API SEATS AVAILABILITY API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API “I also need to know which seats are already reserved for show Z” OUR CORE DOMAIN SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 11. AUDITORIUM SEATING API SEATS AVAILABILITY API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API “I also need to know which seats are already reserved for show Z” SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 12. AUDITORIUM SEATING API SEATS AVAILABILITY API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API “I also need to know which seats are already reserved for show Z” “Ok. You can have seats A1, A2, A3 in pricing tier 1, C4, C5, C6 in pricing tier 2 …” SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 13. AUDITORIUM SEATING API SEATS AVAILABILITY API “I need the auditorium seating of show Z” SEATS SUGGESTIONS API “I also need to know which seats are already reserved for show Z” “Ok. You can have seats A1, A2, A3 in pricing tier 1, C4, C5, C6 in pricing tier 2 …” SUGGESTING SEATS IN THEATERS “What seats can you suggest for 3 people wishing to attend the show Z?”
- 15. 1.
- 19. 2.
- 20. 2.
- 30. FUNCTIONAL CORE, IMPERATIVE SHELL IN MOTION
- 37. FROM HEXAGONAL TO FUNCTIONAL CORE (LIVE CODING)
- 38. (LIVE CODING)
- 39. MORE FUNCTIONAL?
- 42. (LIVE CODE)
- 43. Makes decisions Imperative Shell acts upon these decisions FUNCTIONAL CORE – THEATER
- 44. HOW TO COPE WITH MULTIPLE I/O IN SEQUENCE?
- 48. FUNCTIONAL CORE – TRAIN RESERVATION (Imperative shell version)
- 49. FUNCTIONAL CORE – TRAIN RESERVATION Call non-pure functions (Imperative shell version)
- 50. FUNCTIONAL CORE – TRAIN RESERVATION Call pure function - Make decisions Call non-pure functions (Imperative shell version)
- 51. FUNCTIONAL CORE – TRAIN RESERVATION Call pure function - Make decisions Acts upon these decisions Call non-pure functions (Imperative shell version)
- 52. TO SUM-UP
- 53. FEATURE HEXAGONAL ARCHITECTURE FUNCTIONAL ARCHITECTURE Separate Infra from Business Yes “Yes” Business Code without side effect Business Decision are in Business part Offers good ability to test Technical concerns never leak from domain HEXAGONAL OR FUNCTIONAL CORE?
- 54. FEATURE HEXAGONAL ARCHITECTURE FUNCTIONAL ARCHITECTURE Separate Infra from Business Yes “Yes” Business Code without side effect No* Yes Business Decision are in Business part Offers good ability to test Technical concerns never leak from domain HEXAGONAL OR FUNCTIONAL CORE?
- 55. FEATURE HEXAGONAL ARCHITECTURE FUNCTIONAL ARCHITECTURE Separate Infra from Business Yes “Yes” Business Code without side effect No* Yes Business Decision are in Business part Yes “Yes” Offers good ability to test Technical concerns never leak from domain HEXAGONAL OR FUNCTIONAL CORE?
- 56. FEATURE HEXAGONAL ARCHITECTURE FUNCTIONAL ARCHITECTURE Separate Infra from Business Yes “Yes” Business Code without side effect No* Yes Business Decision are in Business part Yes “Yes” Offers good ability to test Yes Yes Technical concerns never leak from domain HEXAGONAL OR FUNCTIONAL CORE?
- 57. FEATURE HEXAGONAL ARCHITECTURE FUNCTIONAL ARCHITECTURE Separate Infra from Business Yes “Yes” Business Code without side effect No* Yes Business Decision are in Business part Yes “Yes” Offers good ability to test Yes Yes Technical concerns never leak from domain No Yes HEXAGONAL OR FUNCTIONAL CORE?
- 58. Feature Hexagonal Architecture Functional Architecture Separate Infra from Business Yes “Yes” Business Code without side effect No* Yes Business Decision are in Business part Yes “Yes” Offers good ability to test Yes Yes Technical concerns never leak from domain No Yes DOES IT MAKE SENSE TO COMPARE THEM?!? BTW…
- 59. Feature Hexagonal Architecture Functional Architecture Separate Infra from Business Yes “Yes” Business Code without side effect No* Yes Business Decision are in Business part Yes “Yes” Offers good ability to test Yes Yes Technical concerns never leak from domain No Yes DOES IT MAKE SENSE TO COMPARE CELERY AND CHOCOLATE?!? BTW…
- 60. Feature Hexagonal Architecture Functional Architecture Separate Infra from Business Yes “Yes” Business Code without side effect No* Yes Business Decision are in Business part Yes “Yes” Offers good ability to test Yes Yes Technical concerns never leak from domain No Yes DOES IT MAKE SENSE TO COMPARE 2 OPTIONS RELATED TO 2 DIFFERENT PARADIGMS?
- 61. OK...
- 62. LAST BUT NOT LEAST… ”BEYOND” HEXAGONAL ARCHITECTURE?!?
- 63. WE HAVE A QUESTION FOR YOU
- 64. HEXAGONAL OR NOT HEXAGONAL?
- 65. HEXAGONAL OR NOT HEXAGONAL? -YES- An Adapter can be an ACL I may not want my domain to be polluted by upstream organizational changes
- 66. HEXAGONAL OR NOT HEXAGONAL? -YES- An Adapter can be an ACL I may not want my domain to be polluted by upstream organizational changes -NO- I want to stick to Alistair original motivations (i.e. technological) 1 port-adapter per technology
- 67. HEXAGONAL OR NOT HEXAGONAL? -YES- It’s a multi-facets pattern! o The technological facet o The testability facet o The tactical DDD facet o The simplicity facet o The quick feedback facet o The late architectural decisions facet o The strategic DDD facet
- 68. HEXAGONAL OR NOT HEXAGONAL?
- 69. AND IF WE FINALLY VOTE NO… o The technological facet o The testability facet o The tactical DDD facet o The simplicity facet o The quick feedback facet o The late architectural decisions facet o The strategic DDD facet THE DDD COMMUNITY WILL HAVE TO FIND NEW NAME(S) FOR ALL OUR USAGES
- 70. THANK YOU!
- 71. SOME REFERENCES THE MAYBE FUNCTOR - MARK SEEMANN https://blog.ploeh.dk/2018/03/26/the-maybe-functor/ https://thinkbeforecoding.com/post/2018/01/25/functional-core FUNCTIONAL CORE - JÉRÉMIE CHASSAING https://www.destroyallsoftware.com/screencasts/catalog/functional-core-imperative-shell FUNCTIONAL CORE, IMPERATIVE SHELL – GARY BERNHARDT HEXAGONAL OR NOT HEXAGONAL? – THOMAS PIERRAIN http://tpierrain.blogspot.com/2020/11/hexagonal-or-not-hexagonal.html