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 RubySPBConf 2k18
Search
Anton Davydov
June 10, 2018
Programming
1
170
Event Sourcing RubySPBConf 2k18
Anton Davydov
June 10, 2018
Tweet
Share
More Decks by Anton Davydov
See All by Anton Davydov
How to make a technical decision
davydovanton
0
85
МГТУ
davydovanton
0
48
Events. Events. Events! - krk.rb
davydovanton
0
130
Events. Events. Events!
davydovanton
0
730
Architecture of hanami applications
davydovanton
1
7.4k
Hanami Architecture
davydovanton
2
250
viewing ruby blossom kaigi2017
davydovanton
0
460
viewing ruby blossom rdrc2017
davydovanton
2
180
rodauth device and you
davydovanton
2
200
Other Decks in Programming
See All in Programming
Kaigi on Rails 2024 〜運営の裏側〜
krpk1900
1
270
Make Impossible States Impossibleを 意識してReactのPropsを設計しよう
ikumatadokoro
0
300
광고 소재 심사 과정에 AI를 도입하여 광고 서비스 생산성 향상시키기
kakao
PRO
0
180
subpath importsで始めるモック生活
10tera
0
340
Micro Frontends Unmasked Opportunities, Challenges, Alternatives
manfredsteyer
PRO
0
120
Functional Event Sourcing using Sekiban
tomohisa
0
110
TypeScriptでライブラリとの依存を限定的にする方法
tutinoko
3
730
카카오페이는 어떻게 수천만 결제를 처리할까? 우아한 결제 분산락 노하우
kakao
PRO
0
110
Creating a Free Video Ad Network on the Edge
mizoguchicoji
0
130
タクシーアプリ『GO』のリアルタイムデータ分析基盤における機械学習サービスの活用
mot_techtalk
6
1.6k
Figma Dev Modeで変わる!Flutterの開発体験
watanave
0
170
Enabling DevOps and Team Topologies Through Architecture: Architecting for Fast Flow
cer
PRO
0
360
Featured
See All Featured
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
0
120
Teambox: Starting and Learning
jrom
133
8.8k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
169
50k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
229
52k
Facilitating Awesome Meetings
lara
50
6.1k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
506
140k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
28
2k
It's Worth the Effort
3n
183
27k
Optimising Largest Contentful Paint
csswizardry
33
2.9k
What's new in Ruby 2.0
geeforr
343
31k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
226
22k
Site-Speed That Sticks
csswizardry
0
40
Transcript
->
[email protected]
title: SPBRuby2k18
None
None
None
None
@palkan_tula
me
What I learned in Japan?
Ruby is still dying language
None
Java is popular
None
Pascal is popular too
None
Best shell ever
None
❤ Руддщ ЫЗИ! ❤
❤ Hello SPB! ❤
None
None
None
Anton Davydov github.com/davydovanton twitter.com/anton_davydov davydovanton.com
• Software developer at Hippo • Hanami core developer •
OpenSource evangelist
None
Stickers
None
Part 1: Real World
DEMO
Part 2: Software
None
None
None
None
None
Pros • easy for understand • easy for implement
Cons • we have only current state of the system
• impossible to understand what happened before
Sometimes we need more work for one event
Imagine what will happen if we will work only with
events?
None
None
None
None
None
Congrats, you know event sourcing!
Part 3: Event Sourcing
– Event Sourcing pattern https://docs.microsoft.com/en-us/azure/architecture/patterns/event-sourcing “Instead of storing just the
current state of the data in a domain, use an append-only store to record the full series of actions taken on that data”
How to get business events?
Event Storming
DDD
Part 4: Event Store
None
None
Can be anything
None
Rules
Immutable events
Immutable everything
How to store events?
None
None
None
None
None
How get current state?
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
How we can improve it?
None
None
None
None
None
None
None
Part 5: Conclusions
Event Sourcing pros
Easier to communicate with domain experts
• time traveling • restore a system • logging out
from box
• You don’t work with tables you work with events
• Experemental data structures • Easy to change database implementations
• Easy to add instances for service • Can be
written on any language and you can call it from any app • Persistance
event sourcing cons
• Hard for understand and complicated abstraction • Not popular
in ruby and bad tooling here • Developers need deprogramming
• Hard to get state • Hard to understand the
whole chain of events • Another architecture type with different DB structure
• Async world • Versions and versions compatibility • Updating
or deleting events • Eventual Consistency
Part 6: Usage
Simple way
gems
None
github.com/zilverline/sequent
Brave way
Build all stuff by self
None
None
None
hanami-events
Just pub sub transport layer with event versions and types
microservices
microservices
None
How to share state across DBs?
Idea #1: send data to specific service
None
Problems
One service know about data from other
1 -> N
None
None
Idea #2: events
None
None
None
Important
Make events full as you can
None
None
None
Part 7: Next Steps
CQRS (Command Query Responsibility Segregation)
– Martin Fowler “You can use a different model to
update information than the model you use to read information”
None
None
None
None
None
None
DDD
None
None
None
Books
None
->
[email protected]
title: SPBRuby2k18
github.com/davydovanton twitter.com/anton_davydov davydovanton.com Thank you ❤