message-handling-main-v1.scala

package polyglotprogramming.messaging.v1
import polyglotprogramming.messaging.*

object Processor:
  def apply(message: IncomingMessage): OutgoingMessage = message match
    case Start(details)   => StartHandler(message.asInstanceOf[Start])
    case DoWork1(details) => DoWork1Handler(message.asInstanceOf[DoWork1])
    case DoWork2(details) => DoWork2Handler(message.asInstanceOf[DoWork2])
    case Stop(details)    => StopHandler(message.asInstanceOf[Stop])

@main def Messaging() =
  println(Processor(Start("start")))
  println(Processor(DoWork1("dowork1")))
  println(Processor(DoWork2("dowork2")))
  println(Processor(Stop("stop")))