Scala: Context & Observability

Michał Bednarz

May 25, 2023

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Scala: Context & Observability

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

Michał Bednarz

May 25, 2023

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Transcript

Scala: Context & Observability
Context propagation explicit parameter implicit parameter
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)
Context propagation on JVM ThreadLocal InheritableThreadLocal DynamicVariable
None
None
None
None
None
Scope Lexical Dynamic Depends on location in source code Depends
on method call graph
None
None
None
Functional context propagation ReaderT / Kleisli (cats) IOLocal (cats-effect) Context
functions (scala 3)
Context propagation with cats-mtl Ask Local Stateful read-only environment effect
dynamic scope effect shared mutable state effect
None
None
None
None
None
None
None
Local + log4cats demo
None
Local + log4cats + IOLocal demo
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None
Scala 3 Context Functions
None
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