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Event Sourcing in Laravel (Full Stack Ghent)
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Freek Van der Herten
April 10, 2019
Programming
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Event Sourcing in Laravel (Full Stack Ghent)
Freek Van der Herten
April 10, 2019
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Transcript
Getting started with event sourcing in Laravel
About me Freek Van der Herten Partner & developer at
Spatie @freekmurze murze.be ohdear.app
Spatie Laravel, front-end development Since 2003 9 awesome human beings
Open Source Software
We create a lot of it ± 200 packages on
Packagist ± 2,000,000 downloads a month ± 30,000,000 total downloads All Postcardware!
Highlights Popular laravel-backup laravel-medialibrary laravel-permission New laravel-query-builder laravel-blade-x
https://spatie.be/open-source
https://spatie.be/open-source/postcards
Let's talk about event sourcing
Talk overview Theory Projectors demo Aggregates demo
Theory
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 fire off 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 Projector
Laravel Event Projector Package made by Spatie Aggregates, Projectors &
Reactors Beautifully integrated into Laravel Easy to get started with
https://docs.spatie.be/laravel-event-projector
Demo
Aggregates
None
None
None
None
None
None
Demo
In closing
Summary Laravel Event Projector Easy to use package to get
started with event sourcing Projectors Replay capabilities Aggregates
Writes are harder, reads are easier
Event sourcing makes the easy things harder… …and the harder
things easier — Frank De Jonge
Larabank github.com/spatie/larabank-traditional github.com/spatie/larabank-event-projector github.com/spatie/larabank-event-projector-aggregates github.com/spatie/larabank-eventsauce
Resources kickstarter.engineering/event-sourcing-made-simple-4a2625113224 github.com/spatie/laravel-event-projector github.com/eventsaucephp/eventsauce github.com/prooph
Thank you! speakerdeck.com/freekmurze/event-sourcing-full-stack-ghent spatie.be/open-source murze.be ohdear.app