Event Sourcing in Laravel (Full Stack Ghent)

Transcript

1. Getting started with event sourcing in Laravel

2. About me Freek Van der Herten Partner & developer at

   Spatie @freekmurze murze.be ohdear.app

3. Spatie Laravel, front-end development Since 2003 9 awesome human beings

4. Open Source 
 Software

5. We create a lot of it ± 200 packages on

   Packagist ± 2,000,000 downloads a month ± 30,000,000 total downloads All Postcardware!

6. Highlights Popular laravel-backup laravel-medialibrary laravel-permission New laravel-query-builder laravel-blade-x

7. https://spatie.be/open-source

8. https://spatie.be/open-source/postcards

9. Let's talk about event sourcing

10. Talk overview Theory Projectors demo Aggregates demo

11. Theory

12. Traditional application Write data in database An update means overwriting

    the old data The old data cannot be accessed anymore

13. APPLICATION DATABASE TABLE value X

14. APPLICATION DATABASE TABLE value X value Y

15. Event Sourced Application The application will fire off events Events

    will get written in a dedicated store Events are passed to consumers that create projections Aggregate, Aggregate Root...

16. APP EVENTS Event Event 1

17. APP EVENTS Event Event 1 Event 2

18. APP EVENTS Event Event 1 Event 2 Event 3

19. APP CONSUMER EVENTS PROJECTION Event Event 1 Event 2 Event

    3

20. APP CONSUMER CONSUMER 2 EVENTS PROJECTION Event Event 1 Event

    2 Event 3 ANOTHER PROJECTION

21. APP CONSUMER CONSUMER 2 EVENTS PROJECTION Event Event 1 Event

    2 Event 3 ANOTHER PROJECTION

22. APP CONSUMER CONSUMER 2 EVENTS PROJECTION Event Event 1 Event

    2 Event 3 Event 4 ANOTHER PROJECTION

23. Event Sourced Application Auditing requirements Extra reports needed Recording the

    unhappy path There is some setup required

24. Laravel 
 Event Projector

25. Laravel Event Projector Package made by Spatie Aggregates, Projectors &

    Reactors Beautifully integrated into Laravel Easy to get started with

26. https://docs.spatie.be/laravel-event-projector

27. Demo

28. Aggregates

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35. Demo

36. In closing

37. Summary Laravel Event Projector Easy to use package to get

    started with event sourcing Projectors Replay capabilities Aggregates

38. Writes are harder, reads are easier

39. Event sourcing makes the easy things harder… …and the harder

    things easier — Frank De Jonge

40. Larabank github.com/spatie/larabank-traditional github.com/spatie/larabank-event-projector github.com/spatie/larabank-event-projector-aggregates github.com/spatie/larabank-eventsauce

41. Resources kickstarter.engineering/event-sourcing-made-simple-4a2625113224 github.com/spatie/laravel-event-projector github.com/eventsaucephp/eventsauce github.com/prooph

42. Thank you! speakerdeck.com/freekmurze/event-sourcing-full-stack-ghent spatie.be/open-source murze.be ohdear.app