Begin EventSourcing with Lagom - Javaforum Q4 2017

Relational databases are great! They are well proven powerhouses in persisting state, but are they always the best solution to your problems?

Join me as we explore a more functional approach to how we deal with state in our systems. We'll start by covering the basis of EventSourcing and continue to take a hands-on look on the Lagom framework and Akka. You will hopefully leave with a stepping stone to start to implement EventSourced systems on the JVM.

Transcript

1. EVENT SOURCING WITH LAGOM
2. ME A few words about Ola Petersson @gotoOla ola.petersson@squeed.com JUG Gothenburg (JavaForum Göteborg)
3. .
4. ID.1 50
5. ID.1 51
6. ID.1 52
8. 50 + 1 + 1 = 52
9. 50 + 1 + 1 = 52
10. COMMANDS EVENTS aggregates
11. COMMANDS EVENTS aggregates
12. COMMANDS EVENTS aggregates
13. CMD
14. CMD EVENT
15. CMD EVENT OLD
16. CMD EVENT OLD NEW
17. EVENT
18. { food: [], drinks: [] } commands Events AGGREGATE
19. { addBurger } { food: [], drinks: [] } commands Events AGGREGATE
20. { addBurger } { food: [], drinks: [] } { burgerAdded } commands Events AGGREGATE
21. { addBurger } { food: [burger], drinks: [] } { burgerAdded } commands Events AGGREGATE
22. { addBurger } { food: [burger], drinks: [] } { addBeer } { burgerAdded } commands Events AGGREGATE
23. { addBurger } { food: [burger], drinks: [] } { addBeer } { burgerAdded } { beerAdded } commands Events AGGREGATE
24. { addBurger } { food: [burger], drinks: [beer] } { addBeer } { burgerAdded } { beerAdded } commands Events AGGREGATE
25. { addBurger } { food: [burger], drinks: [beer] } { addSalad } { addBeer } { burgerAdded } { beerAdded } commands Events AGGREGATE
26. { addBurger } { food: [burger], drinks: [beer] } { addSalad } { addBeer } { burgerAdded } { saladAdded } { beerAdded } commands Events AGGREGATE
27. { addBurger } { food: [burger, salad ], drinks: [beer] } { addSalad } { addBeer } { burgerAdded } { saladAdded } { beerAdded } commands Events AGGREGATE
28. { addBurger } { food: [burger, salad ], drinks: [beer, water] } { addSalad } { addBeer } { addWater } { burgerAdded } { saladAdded } { beerAdded } { waterAdded } commands Events AGGREGATE
29. .
31. akka
33. CHANGE HISTORY AUDIT LOG SPEED TIME TRAVEL
34. CHANGE HISTORY AUDIT LOG SPEED TIME TRAVEL
35. CHANGE HISTORY AUDIT LOG SPEED TIME TRAVEL
36. CHANGE HISTORY AUDIT LOG SPEED TIME TRAVEL
37. event storming
38. READ?
39. CQRS WRITE READ
40. EVENTUAL CONSISTENCY … a necessary evil
41. MICROSERVICES
42. SILVERBULLET!
43. SILVERBULLET!
44. http://widr.se/slides
45. http://widr.se/code
46. • lagom - lagomframework.com/ • Akka - https://akka.io/ • reactive microsystems - https://t.co/dm4wLJKV6f by Jonas Bonér • develop reactive microservices - https://www.lightbend.com/blog/developing-reactive-microservi ces-free-oreilly-mini-book-by-java-champion-markus-eisele by Markus Eisele • Event Sourcing - https://martinfowler.com/eaaDev/EventSourcing.html by Martin Fowler •
47. QUESTIONS?
48. http://widr.se/survey