How to get object that caused failure in Akka Streams?

问题

According to akka streams docs one can handle stream failure by defining a decider that maps a Throwable to a Strategy:

val decider: Supervision.Decider = {
  case _: ArithmeticException => Supervision.Resume
  case _                      => Supervision.Stop
}

I wonder if there is a way to also get access to the element that caused the error. Of course, the type of this element is unknown, but is there a way to get it even as an instance of Object?

回答1:

The trivial way would be to catch the ArithmeticException near where it is thrown and throw your custom exception MyDetailedArithmeticException(culprit: Int) that would print the int that caused the problem in the message.

来源：https://stackoverflow.com/questions/36179093/how-to-get-object-that-caused-failure-in-akka-streams