Projecting events in Laravel (Laravel Live)

Transcript

1. Projecting events in Laravel

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

   Spatie @freekmurze https://murze.be https://ohdear.app

3. Spatie Since 2003 Websites, applications and webshops Team 9 awesome

   human beings Specialisation Laravel, front-end development

4. Open Source 
 Software

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

   Packagist ± 2,000,000 downloads a month ± 25,000,000 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 projecting events

10. Talk overview Theory Laravel Event Projector 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. Using projectors The application will fire off events Events will

    get written in a dedicated store Events are passed to classes that can handle them

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. Projecting events Auditing requirements Extra reports needed There is some

    setup required

24. Laravel 
 Event Projector

25. Laravel Event Projector It's not full event sourcing, it focuses

    on projections Beautifully integrated into Laravel Easy to get started with

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

27. Demo

28. In closing

29. Summary Easy to use package to get started with projections

    Hooks into Laravel's native events Replay capabilities Writes are harder, reads are easier

30. Resources https://kickstarter.engineering/event-sourcing-made-simple-4a2625113224 https://dev.to/barryosull/event-sourcing-what-it-is-and-why-its-awesome https://www.youtube.com/watch?v=28jmTeN3VYc https://github.com/eventsauce

31. Thank you! https://speakerdeck.com/freekmurze/projecting-events-in-laravel https://spatie.be/open-source https://murze.be https://ohdear.app https://fullstackeurope.com