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Scala: Context & Observability

Avatar for Michał Bednarz Michał Bednarz
May 25, 2023
Programming
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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

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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