first commit

ActorDemo.sc

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+#!/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() = {
+  val t = new Thread(() => {
+    implicit val rootActor =
+      ActorSystem(RootActor(), "TestActors")
+
+    implicit val timeout: Timeout = 3.seconds
+
+    rootActor ! RootActor.Begin
+    rootActor ! RootActor.GetResult
+  })
+  t.setDaemon(true)
+  t.start()
+  Thread.sleep(1000)
+  System.exit(0)
+}

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute
+this software, either in source code form or as a compiled binary, for any
+purpose, commercial or non-commercial, and by any means.
+
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and
+to the detriment of our heirs and successors. We intend this dedication to
+be an overt act of relinquishment in perpetuity of all present and future
+rights to this software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
+THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. For more information,
+please refer to <https://unlicense.org/>

README.md

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+# Akka Actors Demo
+
+An experiment to see how the actor model can be used to synchronize / encapsulate mutable state without the use of locks.
+
+## Usage
+``` bash
+./ActorsDemo.sc
+```
+
+Sample output: 
+```
+22:11:47.473 [TestActors-akka.actor.default-dispatcher-3] INFO ammonite.$file.ActorDemo$RootActor$ - --- Beginning ---
+
+22:11:47.475 [TestActors-akka.actor.default-dispatcher-6] INFO ammonite.$file.ActorDemo$CounterActor$ - Value of counter is 5
+
+22:11:47.475 [TestActors-akka.actor.default-dispatcher-3] INFO ammonite.$file.ActorDemo$RootActor$ - Received message Reply(5)
+```