Added sample from tutorials

HelloScala/out/production/HelloScala/application.conf

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+akka {
+  loglevel = INFO
+}

HelloScala/project/plugins.sbt

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+addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.6.0")

HelloScala/src/main/resources/application.conf

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+akka {
+  loglevel = INFO
+}

HelloScala/src/main/scala/com/example/ExtractorLab.scala

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+package com.example
+
+object ExtractorLab extends App {
+
+  val httpUrl = "http://www.google.com"
+  val ftpUrl = "ftp://www.google.com"
+  val sshUrl = "ssh://www.google.com"
+
+  val url = new MyUrl(httpUrl)
+  printProtoType(url)
+  val url2 = new MyUrl(ftpUrl)
+  printProtoType(url2)
+  val url3 = new MyUrl(sshUrl)
+  printProtoType(url3)
+  val url4 = new MyUrl("")
+  printProtoType(url4)
+  val url5 = new MyUrl(null)
+  printProtoType(url5)
+
+  def printProtoType(url: MyUrl): Unit = {
+    url match {
+//      case MyUrl(x) => println("x matches: " + x) // Both constructor pattern is valid
+      case MyUrl(protocol, _) if protocol.equals("http") => println("It's a HTTP endpoint")
+      case MyUrl(protocol, _) if protocol.equals("ftp") => println("FTP is the way")
+      case MyUrl(protocol, _) => println("I have no idea what this is: " + protocol)
+      case _ => println("Unknown input")
+    }
+  }
+
+  val urlList = List(url, url2, url3, url4, url5)
+//  urlList.map(_.protocol.getOrElse("Not specified")).foreach(prot => println("protocol is: " + prot))
+  urlList.filter(_.url != None).map(_.url).foreach(outUrl => println("url is: " + outUrl.get))
+  urlList.filter(_.protocol != None).map(_.protocol).foreach(protocol => if (!protocol.get.isEmpty) println("protocol is: " + protocol.get))
+
+  println("do the same with flatmap")
+  urlList.flatMap(_.url).foreach(flatUrl => println("flatmap url: " + flatUrl))
+  urlList.flatMap(_.protocol).foreach(flatProt => if (!flatProt.isEmpty) println("flatmap protocol: " + flatProt))
+}
+
+class MyUrl(val inputUrl: String)  {
+//  private val urlSplit: Array[String] = if (inputUrl.isEmpty) Array.fill[String](2)("") else inputUrl.split("://")
+  private val urlSplit: Array[String] = Option(inputUrl).getOrElse("").split("://")
+  def protocol = Option(urlSplit(0))
+  def url = if(urlSplit.length < 2) None else Some(urlSplit(1))
+}
+
+object MyUrl {
+  def unapply(arg: MyUrl): Option[(String, String)] = {
+//    if (!(arg.url == null) && !(arg.protocol == null)) Some((arg.protocol.getOrElse(""), arg.url))
+//    else None
+    Some((arg.protocol.getOrElse("(undefined)"), arg.url.getOrElse("(undefined)")))
+  }
+//  def unapplySeq(arg: MyUrl): Option[Seq[String]] = {
+//    if (!arg.url.isEmpty && !arg.protocol.isEmpty) Some(Array(arg.protocol, arg.url))
+//    else None
+//  }
+}
+
+

akka-pi-calculator/build.sbt

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+name := "My Project"
+
+version := "1.0"
+
+scalaVersion := "2.9.1"
+
+resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"
+
+libraryDependencies += "com.typesafe.akka" % "akka-actor" % "2.0"

akka-pi-calculator/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.example</groupId>
+  <artifactId>firstproj</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>firstproj</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.typesafe.akka</groupId>
+      <artifactId>akka-actor_2.11</artifactId>
+      <version>2.4.4</version>
+    </dependency>
+  </dependencies>
+
+  <!--<repositories>-->
+    <!--<repository>-->
+      <!--<id>akka-snapshots</id>-->
+      <!--<snapshots>-->
+        <!--<enabled>true</enabled>-->
+      <!--</snapshots>-->
+      <!--<url>http://repo.akka.io/snapshots/</url>-->
+    <!--</repository>-->
+  <!--</repositories>-->
+</project>

akka-pi-calculator/src/main/scala/com/example/Pi.scala

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+package com.example
+
+import akka.actor.Actor
+import akka.actor._
+
+object Pi extends App {
+
+  calculate(nrOfWorkers = 4, nrOfElements = 10000, nrOfMessages = 10000)
+
+  sealed trait PiMessage
+  case object Calculate extends PiMessage
+  case class Work(start: Int, nrOfElements: Int) extends PiMessage
+  case class Result(value: Double) extends PiMessage
+  case class PiApproximation(pi: Double, duration: Long)
+
+  class Worker extends Actor {
+
+    def calculatePiFor(start: Int, nrOfElements: Int): Double = {
+      var acc = 0.0
+      for (i <- start until (start + nrOfElements))
+        acc += 4.0 * (1 - (i % 2) * 2) / (2 * i + 1)
+      acc
+    }
+
+    def receive = {
+      case Work(start, nrOfElements) =>
+        sender ! Result(calculatePiFor(start, nrOfElements)) // perform the work
+    }
+  }
+
+  class Master(nrOfWorkers: Int, nrOfMessages: Int, nrOfElements: Int, listener: ActorRef)
+    extends Actor {
+
+    var pi: Double = _
+    var nrOfResults: Int = _
+    val start: Long = System.currentTimeMillis
+
+    val workerRouter = context.actorOf(
+      Props[Worker], "workerRouter")
+//      Props[Worker].withRouter(RoundRobinRouter(nrOfWorkers)), name = "workerRouter")
+
+    def receive = {
+      case Calculate =>
+        for (i <- 0 until nrOfMessages) workerRouter ! Work(i * nrOfElements, nrOfElements)
+      case Result(value) =>
+        pi += value
+        nrOfResults += 1
+        if (nrOfResults == nrOfMessages) {
+          // Send the result to the listener
+          listener ! PiApproximation(pi, duration = (System.currentTimeMillis - start))
+          // Stops this actor and all its supervised children
+          context.stop(self)
+        }
+    }
+
+  }
+
+  class Listener extends Actor {
+    def receive = {
+      case PiApproximation(pi, duration) =>
+        println("\n\tPi approximation: \t\t%s\n\tCalculation time: \t%s"
+          .format(pi, duration))
+        context.system.shutdown()
+    }
+  }
+
+
+  def calculate(nrOfWorkers: Int, nrOfElements: Int, nrOfMessages: Int) {
+    // Create an Akka system
+    val system = ActorSystem("PiSystem")
+
+    // create the result listener, which will print the result and shutdown the system
+    val listener = system.actorOf(Props[Listener], name = "listener")
+
+    // create the master
+    val master = system.actorOf(Props(new Master(
+      nrOfWorkers, nrOfMessages, nrOfElements, listener)),
+      name = "master")
+
+    // start the calculation
+    master ! Calculate
+
+  }
+}

akka-sample-main-scala/COPYING

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akka-sample-main-scala/LICENSE

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+Activator Template by Lightbend
+
+Licensed under Public Domain (CC0)
+
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+this Activator Tempate has waived all copyright and related or neighboring
+rights to this Activator Template.
+
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+work.  If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.