Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Scala: Context & Observability

Avatar for Michał Bednarz Michał Bednarz
May 25, 2023
Programming
0
77

Scala: Context & Observability

Slides for The Art of Scala presentation in Warsaw on 25th May 2023

Avatar for Michał Bednarz

Michał Bednarz

May 25, 2023
Tweet

More Decks by Michał Bednarz

See All by Michał Bednarz
Scala: The Ideal Language for Game Wallets
Avatar for Michał Bednarz bednam
0
16
Concurrency in Scala: from locks to STM
Avatar for Michał Bednarz bednam
0
160

Other Decks in Programming

See All in Programming
15年目のiOSアプリを1から作り直す技術
Avatar for TAKEDA Yuki teakun
1
600
コーディングルールの鮮度を保ちたい / keep-fresh-go-internal-conventions
Avatar for NAGATA Hiroaki handlename
0
150
Head of Engineeringが現場で回した生産性向上施策 2025→2026
Avatar for gessy0129 gessy0129
0
210
RAGでハマりがちな"Excelの罠"を、データの構造化で突破する
Avatar for harumi harumiweb
9
2.4k
ベクトル検索のフィルタを用いた機械学習モデルとの統合 / python-meetup-fukuoka-06-vector-attr
Avatar for monochromegane monochromegane
2
280
Python’s True Superpower
Avatar for Hynek Schlawack hynek
0
200
Claude Codeセッション現状確認 2026福岡 / fukuoka-aicoding-00-beacon
Avatar for monochromegane monochromegane
4
380
new(1.26) ← これすき / kamakura.go #8
Avatar for utagawa kiki utgwkk
0
1.6k
Railsの気持ちを考えながらコントローラとビューを整頓する/tidying-rails-controllers-and-views-as-rails-think
Avatar for MOROHASHI Kyosuke moro
4
370
CSC307 Lecture 14
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
450
日本だけで解禁されているアプリ起動の方法
Avatar for Ryu-nakayama ryunakayama
0
370
Rubyと楽しいをつくる / Creating joy with Ruby
Avatar for chobishiba chobishiba
0
200

Featured

See All Featured
What’s in a name? Adding method to the madness
Avatar for The Alliance productmarketing
PRO
24
4k
Google's AI Overviews - The New Search
Avatar for Barry Adams badams
0
930
Design in an AI World
Avatar for tapps tapps
0
160
brightonSEO & MeasureFest 2025 - Christian Goodrich - Winning strategies for Black Friday CRO & PPC
Avatar for Christian Goodrich cargoodrich
3
110
New Earth Scene 8
Avatar for Sydney Stone popppiees
1
1.7k
Distributed Sagas: A Protocol for Coordinating Microservices
Avatar for Caitie McCaffrey caitiem20
333
22k
Building a A Zero-Code AI SEO Workflow
Avatar for Ian Lurie portentint
PRO
0
370
DevOps and Value Stream Thinking: Enabling flow, efficiency and business value
Avatar for Helen Beal helenjbeal
1
140
Balancing Empowerment & Direction
Avatar for Lara Hogan lara
5
930
Embracing the Ebb and Flow
Avatar for Simon Collison colly
88
5k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
Avatar for soudai sone soudai
PRO
199
73k
Efficient Content Optimization with Google Search Console & Apps Script
Avatar for Katarina Dahlin katarinadahlin
PRO
1
360

Transcript

  1. Scala: Context & Observability

  2. Context propagation explicit parameter implicit parameter

  3. Thread-safe state on JVM AtomicRef ThreadLocal Every thread has its

    own local copy of the state which is not visible to the others Shared state safely updated by many threads using optimistic concurrency (CAS)

  4. Context propagation on JVM ThreadLocal InheritableThreadLocal DynamicVariable

  5. None
  6. None
  7. None
  8. None
  9. None

  10. Scope Lexical Dynamic Depends on location in source code Depends

    on method call graph
  11. None
  12. None
  13. None

  14. Functional context propagation ReaderT / Kleisli (cats) IOLocal (cats-effect) Context

    functions (scala 3)

  15. Context propagation with cats-mtl Ask Local Stateful read-only environment effect

    dynamic scope effect shared mutable state effect
  16. None
  17. None
  18. None
  19. None
  20. None
  21. None
  22. None

  23. Local + log4cats demo

  24. None

  25. Local + log4cats + IOLocal demo

  26. None
  27. None

  28. Scala 3 Context Functions

  29. None

  30. linktr.ee/mbednarz