Event Sourcing In Laravel

Transcript

1. Event Sourcing
   

   in Laravel
   

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2. About me
   
   
   Freek Van der Herten
   
   
   @freekmurze
   
   
   spatie.be
   
   
   freek.dev
   
   
   ohdear.app
   
   f
   l
   areapp.io
   

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3. Open Source
   

   Software
   

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4. spatie.be/open-source
   

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5. spatie.be/videos
   

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6. Let's talk about
   event sourcing
   

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7. Talk overview
   
   
   Theory
   
   
   Projectors demo
   
   
   Aggregates demo
   

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

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9. APPLICATION
   DATABASE
   TABLE
   value X
   

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10. APPLICATION
    DATABASE
    TABLE
    value X
    value Y
    

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11. Event Sourced Application
    
    
    The application will
    f
    i
    re o
    f
    f
    events
    
    
    Events will get written in a dedicated store
    
    
    Events are passed to consumers that create projections
    
    
    Aggregate, Aggregate Root...
    

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12. APP EVENTS
    Event
    Event 1
    

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13. APP EVENTS
    Event
    Event 1
    Event 2
    

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14. APP EVENTS
    Event
    Event 1
    Event 2
    Event 3
    

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

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

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

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

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19. Event Sourced Application
    
    
    Auditing requirements
    
    
    Extra reports needed
    
    
    Recording the unhappy path
    
    
    There is some setup required
    
    
    

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20. Laravel
    

    Event Sourcing
    

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21. Laravel Event Sourcing
    
    
    Package made by Spatie
    
    
    Aggregates, Projectors & Reactors
    
    
    Beautifully integrated into Laravel
    
    
    Easy to get started with
    

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22. Demo
    

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23. Aggregates
    

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30. Demo
    

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31. Wrapping up
    

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32. spatie.be/docs/laravel-event-sourcing
    

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33. Packages
    
    
    spatie.be/docs/laravel-event-sourcing
    
    
    eventsauce.io
    

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34. Event sourcing makes the easy things harder…
    
    
    …and the harder things easier
    
    
    — Frank De Jonge
    

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35. Course
    
    
    eventsourcery.com
    

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

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37. One more thing
    

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38. spatie.be/event-sourcing
    
    
    The basics of event sourcing
    
    
    Best practices
    
    
    Laravel speci
    f
    i
    c examples
    
    
    Event sourced cart
    
    
    ETA July 2021
    

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39. Thank you!
    
    
    spatie.be/docs/laravel-event-sourcing
    
    
    spatie.be/products (only this week 25 % discount on everything)
    
    
    ohdear.app
    

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