Event Sourcing In Laravel

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Event Sourcing   in Laravel

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

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Open Source   Software

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spatie.be/open-source

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spatie.be/videos

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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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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 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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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 Sourcing

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

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Demo

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Aggregates

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Demo

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Wrapping up

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spatie.be/docs/laravel-event-sourcing

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

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

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Course eventsourcery.com

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

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One more thing

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