Akka-Actors-Demo/ActorDemo.sc

#!/usr/bin/env amm

import $ivy.`com.typesafe.akka::akka-actor-typed:2.6.8`
import $ivy.`ch.qos.logback:logback-classic:1.2.3`

import akka.actor.typed.delivery.ConsumerController.Command
import akka.actor.Actor
import akka.actor.typed.ActorRef
import akka.actor.typed.ActorSystem
import akka.actor.typed.Behavior
import akka.actor.typed.scaladsl.Behaviors
import akka.util.Timeout
import scala.concurrent.duration._
import akka.actor.typed.scaladsl.AskPattern._
import scala.concurrent.ExecutionContext.Implicits.global

object CounterActor {
  sealed trait Command
  final case object IncCount extends Command
  final case class CounterResult(count: Int)
  final case class GetResult(sender: ActorRef[RootActor.Command])
      extends Command

  var counter = 0

  def apply(): Behavior[Command] =
    Behaviors.receive { (context, command) =>
      command match {
        case IncCount => counter += 1
        case GetResult(sender) =>
          context.log.info(s"Value of counter is $counter");
          sender ! RootActor.Reply(counter)
      }

      Behaviors.same
    }

}

object RootActor {
  sealed trait Command
  case class Reply[T](reply: T) extends Command
  case object Begin extends Command
  case object GetResult extends Command

  implicit val timeout: Timeout = 3.seconds

  def apply(): Behavior[Command] =
    Behaviors.setup { context =>
      implicit val system = context.system

      val counterActor = context.spawn(CounterActor(), "counterActor")

      Behaviors.receiveMessage { message =>
        message match {
          case Reply(reply) => context.log.info(s"Received message $message")
          case Begin =>
            context.log.info("--- Beginning ---")

            counterActor ! CounterActor.IncCount
            counterActor ! CounterActor.IncCount
            counterActor ! CounterActor.IncCount
            counterActor ! CounterActor.IncCount
            counterActor ! CounterActor.IncCount

          case GetResult =>
            counterActor ! CounterActor.GetResult(
              context.self
            )
        }

        Behaviors.same
      }

    }
}

@main
def main() = {
  implicit val rootActor =
    ActorSystem(RootActor(), "TestActors")

  implicit val timeout: Timeout = 3.seconds

  rootActor ! RootActor.Begin
  rootActor ! RootActor.GetResult

  Thread.sleep(1000)
}