a proof-of-concept Scala Play webapp using monadic logging around I/O that can fail. Uses scalaz and monad transformers.
Using a traditional mutable logger singleton means that logs from concurrent requests are interleaved. If we were to pass logs up the call stack, rather than mutating a global, we have access to the complete and isolated logs across the duration of a request, even in the presence of errors.
We use a monad similar to Writer[List[String], Either[Throwable, A]] to achieve this.
Does not require Play installed; SBT will download play along with other dependencies.
From the project root: sbt play run
Distributed under the MIT License.
Contributors:
- Dustin Getz
- Martin Snyder