Simplify State management in Spring Boot with HATEOAS and KFSM

This deck accompanied a presentation from I Code Java 2020.
We cover the definition of a Finite State Machine using KFSM and implementing a Service and Controller to expose it via Rest Controller using HATEOAS and HAL.
We show how an Angular application can easily consume the API.

Transcript

1. Simplify State management in Spring Boot with HATEOAS and KFSM Corneil du Plessis Chief Architect, JumpCO
2. About me
3. Quotable quotes K.I.S.S. – Keep it simple stupid! Graeme Mitchell “Everything should be a simple as possible, but no simpler” Albert Einstein
4. Introduction Simplify State management in Spring Boot with HATEOAS and KFSM • Demo • Design • KFSM Definition • Context • Service • HATEOAS • Controller • UI – Service • UI - Components
5. Demo – Spring Boot + Angular
6. Design – FSM definition and context
7. Simple Turnstile State Diagram from KFSM
8. Simple Turnstile State Chart from KFSM Start Event[Guard] Target Action LOCKED COIN UNLOCKED { unlock() } UNLOCKED PASS LOCKED { lock() } UNLOCKED COIN UNLOCKED { returnCoin() }
9. KFSM DSL for Turnstile
10. Design – Service Classes
11. HATEOAS • Hypermedia as the Engine of Application State ◦ Entities ◦ Links ◦ Collections ◦ Pages
12. API Info
13. API - Create
14. API – COIN
15. API – 2nd COIN
16. API - PASS
17. API – 2nd PASS
18. API - Page
19. API - Pages
20. Design - Controller
21. Code – Rest Controller
22. Code – Rest Representation Model Assembler
23. Design – API Service
24. Design – UI Classes
25. Design – Page Components
26. Code – Client list and create
27. Code – Client event and delete
28. Code – Turnstile component HTML
29. Finally • Finite State Machine • Encapsulated as a Service • Controller renders HATEOAS models • Front-end can easily consume HATEOAS via named templated links
30. Resources • Twitter - @corneil • Slides - https://speakerdeck.com/corneil/simplify-state-management-in-spring-boot-with-hateoas-and-kfsm • KFSM Source - https://github.com/open-jumpco/kfsm • Rest Server - https://github.com/open-jumpco/kfsm-spring-rest • HATEOAS Client – https://github.com/open-jumpco/kfsm-hateoas-client Please complete the feedback form.