Event Sourcing in Laravel (Full Stack Ghent)

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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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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