A Sense of Place: What ReaderT Can Do in a Purely Functional World
summary
Claims a concrete pattern: use ReaderT to carry a composable "place" environment so log lines, exceptions and simple profilers show high‑level context instead of raw stack frames. Shows a Scala benchmark runner for quasar (built at slam data), converts two‑argument loggers into an RT-based logger, composes logger stages, and attaches domain traces to exceptions. Demonstrates this in a couple of production Scala programs and explains how logical areas compose for scoped timing and filtering. stack traces are useless is the motivating diagnosis.
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chapters (7)
- 0:00Introduction and context
- 3:52Benchmark design as functions
- 8:52The problem of logging
- 15:19Logger implementation
- 25:44Contextual logging with places
- 30:26Plumbing context with Reader T
- 42:57Abstraction and final thoughts
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