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Event Sourcing In Laravel
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Freek Van der Herten
January 19, 2021
Technology
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Event Sourcing In Laravel
Freek Van der Herten
January 19, 2021
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Transcript
Event Sourcing in Laravel
About me Freek Van der Herten @freekmurze spatie.be freek.dev ohdear.app
f l areapp.io
Open Source Software
spatie.be/open-source
spatie.be/videos
Let's talk about event sourcing
Talk overview Theory Projectors demo Aggregates demo
Traditional application Write data in database An update means overwriting
the old data The old data cannot be accessed anymore
APPLICATION DATABASE TABLE value X
APPLICATION DATABASE TABLE value X value Y
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...
APP EVENTS Event Event 1
APP EVENTS Event Event 1 Event 2
APP EVENTS Event Event 1 Event 2 Event 3
APP CONSUMER EVENTS PROJECTION Event Event 1 Event 2 Event
3
APP CONSUMER CONSUMER 2 EVENTS PROJECTION Event Event 1 Event
2 Event 3 ANOTHER PROJECTION
APP CONSUMER CONSUMER 2 EVENTS PROJECTION Event Event 1 Event
2 Event 3 ANOTHER PROJECTION
APP CONSUMER CONSUMER 2 EVENTS PROJECTION Event Event 1 Event
2 Event 3 Event 4 ANOTHER PROJECTION
Event Sourced Application Auditing requirements Extra reports needed Recording the
unhappy path There is some setup required
Laravel Event Sourcing
Laravel Event Sourcing Package made by Spatie Aggregates, Projectors &
Reactors Beautifully integrated into Laravel Easy to get started with
Demo
Aggregates
None
None
None
None
None
None
Demo
Wrapping up
spatie.be/docs/laravel-event-sourcing
Packages spatie.be/docs/laravel-event-sourcing eventsauce.io
Event sourcing makes the easy things harder… …and the harder
things easier — Frank De Jonge
Course eventsourcery.com
Larabank github.com/spatie/larabank-traditional github.com/spatie/larabank-event-projector github.com/spatie/larabank-event-projector-aggregates
One more thing
spatie.be/event-sourcing The basics of event sourcing Best practices Laravel speci
f i c examples Event sourced cart ETA July 2021
Thank you! spatie.be/docs/laravel-event-sourcing spatie.be/products (only this week 25 % discount
on everything) ohdear.app