Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Event sourcing (laracon online)
Search
Freek Van der Herten
March 06, 2019
Programming
1
400
Event sourcing (laracon online)
Freek Van der Herten
March 06, 2019
Tweet
Share
More Decks by Freek Van der Herten
See All by Freek Van der Herten
I shall define this only once
freekmurze
0
320
An Introduction to Snapshot testing
freekmurze
0
350
Event Sourcing In Laravel
freekmurze
0
190
Building a realtime dashboard with Laravel Livewire (PHPKonf)
freekmurze
0
660
A tour behind the scenes of Oh Dear (PHP Benelux)
freekmurze
2
680
A practical look at multitenancy in Laravel
freekmurze
1
280
A practical look at multitenancy in Laravel (Laracon US)
freekmurze
0
610
Highlights Flare codebase (Laracon online)
freekmurze
0
330
Introducing Mailcoach
freekmurze
1
510
Other Decks in Programming
See All in Programming
オブジェクト指向コードレビューの新しいアプローチ
akkie76
3
1.5k
PHPerKaigi 2024〜10年以上動いているレガシーなバッチシステムを Kubernetes(Amazon EKS) に移行する取り組み〜
tshinowpub
1
220
PHP 8.3で追加されたjson_validate()を徹底的に深掘りしてみよう
mashirou1234
1
720
TCAの Shared Stateって どういう仕組みになってんの?
yimajo
0
330
受託開発でGitLab CI を活用していく
xiombatsg
1
110
決断するための勇気、そのためのBacklog / Courage to make decisions, Backlog for that.
seike460
PRO
4
1.9k
Building a Smaller App Binary
kateinoigakukun
2
200
TDDと今まで
kanayannet
0
140
Material 3で Material 2ぽい見た目にする
numeroanddev
2
250
WasmOS: Wasmを実行する自作Microkernel
riru
0
370
設計の知識と技能で駆動するソフトウェア開発
masuda220
PRO
18
10k
デザインシステムで Tailwind CSSとCSS in JSに分散投資をしたら良かった話
fsubal
14
3.2k
Featured
See All Featured
Imperfection Machines: The Place of Print at Facebook
scottboms
257
12k
Scaling GitHub
holman
456
140k
GraphQLの誤解/rethinking-graphql
sonatard
48
9.1k
Statistics for Hackers
jakevdp
789
220k
The Power of CSS Pseudo Elements
geoffreycrofte
58
4.9k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
19
1.6k
How to train your dragon (web standard)
notwaldorf
71
5.1k
How To Stay Up To Date on Web Technology
chriscoyier
781
250k
Thoughts on Productivity
jonyablonski
57
3.8k
Debugging Ruby Performance
tmm1
68
11k
Web development in the modern age
philhawksworth
201
10k
Fireside Chat
paigeccino
19
2.6k
Transcript
Getting started with event sourcing in Laravel
About me Freek Van der Herten Partner & developer at
Spatie @freekmurze https://murze.be https://ohdear.app
Spatie Since 2003 Websites, applications and webshops Team 9 awesome
human beings Specialisation Laravel, front-end development
Open Source Software
We create a lot of it ± 200 packages on
Packagist ± 2,000,000 downloads a month ± 25,000,000 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 Projecting events in short Laravel Event Projector demo
Eventsauce demo
Event Sourcing in short
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 It's not full
event sourcing, it focuses on projections Beautifully integrated into Laravel Easy to get started with
https://docs.spatie.be/laravel-event-projector
Demo
Eventsauce
Eventsauce Package made by Frank De Jonge Focuses on aggregates
Framework agnostic Separate Laravel bindings package available Very powerful, adds complexity
https://eventsauce.io/docs/
APP Subtract $1000
AGGREGATE ROOT REPOSITORY UUID PAYLOAD TIME APP Subtract $1000
AGGREGATE ROOT REPOSITORY UUID PAYLOAD TIME APP Subtract $1000 RETRIEVE
Subtract $1000 AGGREGATE ROOT (empty)
AGGREGATE ROOT REPOSITORY UUID PAYLOAD TIME APP Subtract $1000 RETRIEVE
PERSIST Subtract $1000 AGGREGATE ROOT ACCOUNTS CONSUMER -$1000 ABC-123 Subtract 1000 11:12 AM (empty)
AGGREGATE ROOT REPOSITORY UUID PAYLOAD TIME APP RETRIEVE PERSIST Subtract
$750 AGGREGATE ROOT ACCOUNTS -$1000 CONSUMER ABC-123 Subtract 1000 11:12 AM Subtract $750 Subtract $1000
AGGREGATE ROOT REPOSITORY UUID PAYLOAD TIME APP RETRIEVE PERSIST Subtract
$750 AGGREGATE ROOT ACCOUNTS -$1750 CONSUMER ABC-123 Subtract 1000 11:12 AM Subtract $750 Subtract $1000 ABC-124 Subtract 750 01:17 PM
AGGREGATE ROOT REPOSITORY UUID PAYLOAD TIME APP RETRIEVE PERSIST AGGREGATE
ROOT ACCOUNTS -$1750 CONSUMER ABC-123 Subtract 1000 11:12 AM ABC-124 Subtract 750 01:17 PM Subtract $1250 Subtract $1000 Subtract $750 Subtract $1250 Propose loan
AGGREGATE ROOT REPOSITORY ABC-123 Subtract 1000 11:12 AM ABC-124 Subtract
750 01:17 PM ABC-125 Subtract 1250, Propose loan 05:51 PM UUID PAYLOAD TIME ACCOUNTS APP CONSUMER CONSUMER 2 PROPOSED LOANS Subtract $1250 -$3000 RETRIEVE PERSIST Subtract $1000 Subtract $750 Subtract $1250 Propose loan AGGREGATE ROOT
Demo
In closing
Summary Laravel Event Projector Easy to use package to get
started with projections Hooks into Laravel's native events Replay capabilities No aggregates
Summary EventSauce Framework agnostic Support for aggregates, process modelling No
replay capabilities out of the box https://github.com/spatie/laravel-eventsauce
Writes are harder, reads are easier
Event sourcing makes the easy things harder… …and the harder
things easier — Frank De Jonge
Larabank https://github.com/spatie/larabank-traditional https://github.com/spatie/larabank-event-projector https://github.com/spatie/larabank-eventsauce
Resources https://kickstarter.engineering/event-sourcing-made-simple-4a2625113224 https://github.com/spatie/laravel-event-projector https://github.com/eventsaucephp/eventsauce https://github.com/prooph
Thank you! https://speakerdeck.com/freekmurze/event-sourcing-laracon-online https://spatie.be/open-source https://murze.be https://ohdear.app https://fullstackeurope.com