Projecting events in Laravel (Laravel Live)

Transcript

1. Projecting events
   in Laravel
   

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2. About me
   Freek Van der Herten
   Partner & developer at Spatie
   @freekmurze
   https://murze.be
   https://ohdear.app
   

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3. Spatie
   Since 2003
   Websites, applications and webshops
   Team
   9 awesome human beings
   Specialisation
   Laravel, front-end development
   

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4. Open Source 

   Software
   

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5. We create a lot of it
   ± 200 packages on Packagist
   ± 2,000,000 downloads a month
   ± 25,000,000 total downloads
   All Postcardware!
   

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

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

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

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9. Let's talk about
   projecting events
   

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10. Talk overview
    Theory
    Laravel Event Projector demo
    

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11. Theory
    

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12. Traditional application
    Write data in database
    An update means overwriting the old data
    The old data cannot be accessed anymore
    

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13. APPLICATION
    DATABASE
    TABLE
    value X
    

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14. APPLICATION
    DATABASE
    TABLE
    value X
    value Y
    

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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
    

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16. APP EVENTS
    Event
    Event 1
    

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17. APP EVENTS
    Event
    Event 1
    Event 2
    

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18. APP EVENTS
    Event
    Event 1
    Event 2
    Event 3
    

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19. APP
    CONSUMER
    EVENTS
    PROJECTION
    Event
    Event 1
    Event 2
    Event 3
    

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20. APP
    CONSUMER
    CONSUMER 2
    EVENTS
    PROJECTION
    Event
    Event 1
    Event 2
    Event 3
    ANOTHER PROJECTION
    

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21. APP
    CONSUMER
    CONSUMER 2
    EVENTS
    PROJECTION
    Event
    Event 1
    Event 2
    Event 3
    ANOTHER PROJECTION
    

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22. APP
    CONSUMER
    CONSUMER 2
    EVENTS
    PROJECTION
    Event
    Event 1
    Event 2
    Event 3
    Event 4
    ANOTHER PROJECTION
    

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23. Projecting events
    Auditing requirements
    Extra reports needed
    There is some setup required
    

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24. Laravel 

    Event Projector
    

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25. Laravel Event Projector
    It's not full event sourcing, it focuses on projections
    Beautifully integrated into Laravel
    Easy to get started with
    

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

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27. Demo
    

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28. In closing
    

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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
    

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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
    

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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
    

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