HyScala Dec 2016 - Introduction to Akka : code examples

intro to akka

repo
====

https://github.com/prassee/hyscala-akka-intro-talk

build.sbt 
=========

name := "hyscala-akka-intro-talk"

version := "1.0"

scalaVersion := "2.11.8"

libraryDependencies ++= Seq("com.typesafe.akka" %% "akka-actor" % "2.4.14")

Code 
====


package hyscala.akka.intro

import akka.actor.{Actor, ActorRef, ActorSystem, Props}

import scala.collection.mutable.ListBuffer

/**
  * plain bare minimum actor
  */
class PlainActor extends Actor {
  println("")
  def receive: Receive = {
    case _ =>
  }
}

class PrimitiveHandlingActor extends Actor {
  def receive: Receive = {
    case "hello world" => println("""received hello world """)
    case 11            => println("received ")
    case _             => println("some other data type")
  }
}

// case class

case class Item(name: String, quantity: Int, rate: Double)
case object Done
case class Order(items: List[Item])
case class Bill(double: Double)

class CartActor(billingActor: ActorRef, cartName: String) extends Actor {
  private val items = ListBuffer[Item]()
  def receive: Receive = {
    case item: Item => items.+=(item)
    case Done =>
      billingActor ! Order(items.toList)
      items.clear()
  }
}

class BillingActor extends Actor {
  def receive: Receive = {
    case order: Order => println(s"""Heres your bill
           |${Bill(order.items.foldLeft(0.0)((a, b) => a + (b.quantity * b.rate)))}""".stripMargin)
  }
}

object AkkaIntroTalk extends App {
  val actorSystem            = ActorSystem("actorsystem")
  val billingActor: ActorRef = actorSystem.actorOf(Props[BillingActor], "billingActor")
  val cartActor: ActorRef    = actorSystem.actorOf(Props(classOf[CartActor], billingActor, "cart1"), "cartActor")

  cartActor ! Item("Apple", 3, 20.0)
  cartActor ! Item("Orange", 3, 15.0)
  cartActor ! Item("Butter", 1, 70.0)

  cartActor ! Done

}