Event Sourcing in Laravel (Full Stack Ghent)

Transcript

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   Getting started with event sourcing in Laravel

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   About me Freek Van der Herten Partner & developer at

   Spatie @freekmurze murze.be ohdear.app
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   Spatie Laravel, front-end development Since 2003 9 awesome human beings

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   Open Source 
 Software

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   We create a lot of it ± 200 packages on

   Packagist ± 2,000,000 downloads a month ± 30,000,000 total downloads All Postcardware!
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   Highlights Popular laravel-backup laravel-medialibrary laravel-permission New laravel-query-builder laravel-blade-x

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   https://spatie.be/open-source

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

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   Let's talk about event sourcing

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    Talk overview Theory Projectors demo Aggregates demo

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    Theory

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    Traditional application Write data in database An update means overwriting

    the old data The old data cannot be accessed anymore
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    APPLICATION DATABASE TABLE value X

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    APPLICATION DATABASE TABLE value X value Y

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    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...
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    APP EVENTS Event Event 1

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    APP EVENTS Event Event 1 Event 2

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    APP EVENTS Event Event 1 Event 2 Event 3

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    APP CONSUMER EVENTS PROJECTION Event Event 1 Event 2 Event

    3
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    APP CONSUMER CONSUMER 2 EVENTS PROJECTION Event Event 1 Event

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

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

    2 Event 3 Event 4 ANOTHER PROJECTION
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    Event Sourced Application Auditing requirements Extra reports needed Recording the

    unhappy path There is some setup required
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    Laravel 
 Event Projector

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    Laravel Event Projector Package made by Spatie Aggregates, Projectors &

    Reactors Beautifully integrated into Laravel Easy to get started with
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    https://docs.spatie.be/laravel-event-projector

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    Demo

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    Aggregates

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    None
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    Demo

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    In closing

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    Summary Laravel Event Projector Easy to use package to get

    started with event sourcing Projectors Replay capabilities Aggregates
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    Writes are harder, reads are easier

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    Event sourcing makes the easy things harder… …and the harder

    things easier — Frank De Jonge
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    Larabank github.com/spatie/larabank-traditional github.com/spatie/larabank-event-projector github.com/spatie/larabank-event-projector-aggregates github.com/spatie/larabank-eventsauce

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    Resources kickstarter.engineering/event-sourcing-made-simple-4a2625113224 github.com/spatie/laravel-event-projector github.com/eventsaucephp/eventsauce github.com/prooph

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    Thank you! speakerdeck.com/freekmurze/event-sourcing-full-stack-ghent spatie.be/open-source murze.be ohdear.app