Event Sourcing in Laravel (Full Stack Ghent)

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
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