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samspills/3131Example.scala

Created March 7, 2023 02:59
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CE 3131 example (maybe)
Raw
3131Example.scala
import cats.effect.std.Dispatcher
import scala.concurrent.duration._
import scala.concurrent.{Await, ExecutionContext, Future}
import cats.effect.unsafe.implicits.global
object StackTraceExample {
case class SomeError(message: String) extends Exception
val (dispatcher, dispatcherShutdown) = Dispatcher.parallel[IO].allocated.unsafeRunSync()
def main(args: Array[String]): Unit = {
val m: Future[Unit] =
dispatcher
.unsafeToFuture(IO.raiseError(SomeError("nice")))
.recover {
case SomeError(message) =>
println(s"recovered from exception: $message")
()
}(ExecutionContext.global)
Await.result(m, 10.seconds)
}
}
object NoTraceExample {
case class SomeError(message: String) extends Exception
val (dispatcher, dispatcherShutdown) = Dispatcher.sequential[IO].allocated.unsafeRunSync()
def main(args: Array[String]): Unit = {
val m: Future[Unit] =
dispatcher
.unsafeToFuture(IO.raiseError(SomeError("nice")))
.recover {
case SomeError(message) =>
println(s"recovered from exception: $message")
()
}(ExecutionContext.global)
Await.result(m, 10.seconds)
}
}
Raw
output.md

The stack trace example prints the recovery message AND the original exception

sbt:cats-effect> exampleJVM/runMain cats.effect.example.StackTraceExample
[info] running cats.effect.example.StackTraceExample
recovered from exception: nice
cats.effect.example.BrokenExample$SomeError
[success] Total time: 0 s, completed Mar. 6, 2023, 9:40:57 p.m.

The no trace example prints only the recovery message

sbt:cats-effect> exampleJVM/runMain cats.effect.example.NoTraceExample
[info] running cats.effect.example.NoTraceExample
recovered from exception: nice
[success] Total time: 2 s, completed Mar. 6, 2023, 9:40:52 p.m.
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