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
190
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
100
МГТУ
davydovanton
0
67
Events. Events. Events! - krk.rb
davydovanton
0
150
Events. Events. Events!
davydovanton
0
780
Architecture of hanami applications
davydovanton
1
7.6k
Hanami Architecture
davydovanton
2
280
viewing ruby blossom kaigi2017
davydovanton
0
630
viewing ruby blossom rdrc2017
davydovanton
2
210
rodauth device and you
davydovanton
2
230
Other Decks in Programming
See All in Programming
為你自己學 Python - 冷知識篇
eddie
1
350
ぬるぬる動かせ! Riveでアニメーション実装🐾
kno3a87
1
200
Rancher と Terraform
fufuhu
2
240
実用的なGOCACHEPROG実装をするために / golang.tokyo #40
mazrean
1
250
テストカバレッジ100%を10年続けて得られた学びと品質
mottyzzz
2
500
[FEConf 2025] 모노레포 절망편, 14개 레포로 부활하기까지 걸린 1년
mmmaxkim
0
1.6k
Improving my own Ruby thereafter
sisshiki1969
1
160
AIコーディングAgentとの向き合い方
eycjur
0
260
Namespace and Its Future
tagomoris
6
700
Android 16 × Jetpack Composeで縦書きテキストエディタを作ろう / Vertical Text Editor with Compose on Android 16
cc4966
0
140
Kiroの仕様駆動開発から見えてきたAIコーディングとの正しい付き合い方
clshinji
1
210
Go言語での実装を通して学ぶLLMファインチューニングの仕組み / fukuokago22-llm-peft
monochromegane
0
120
Featured
See All Featured
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
BBQ
matthewcrist
89
9.8k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3.1k
jQuery: Nuts, Bolts and Bling
dougneiner
64
7.9k
Become a Pro
speakerdeck
PRO
29
5.5k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.7k
A Modern Web Designer's Workflow
chriscoyier
696
190k
The World Runs on Bad Software
bkeepers
PRO
70
11k
A Tale of Four Properties
chriscoyier
160
23k
A better future with KSS
kneath
239
17k
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 ❤