Updated samples and tutorial to Akka 2.0. Added projects to SBT project file. Fixes #1278
This commit is contained in:
Henrik Engstrom
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c0d3c523e2
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823a68ac0f
33 changed files with 1291 additions and 1209 deletions
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@ -1,113 +1,114 @@
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// /**
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// * Copyright (C) 2009-2011 Typesafe Inc. <http://www.typesafe.com>
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// */
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/**
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* Copyright (C) 2009-2011 Typesafe Inc. <http://www.typesafe.com>
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*/
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package akka.tutorial.first.scala
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// package akka.tutorial.first.scala
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import java.util.concurrent.CountDownLatch
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import akka.routing.{ RoutedActorRef, LocalConnectionManager, RoundRobinRouter, RoutedProps }
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import akka.actor.{ ActorSystemImpl, Actor, ActorSystem }
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// import akka.actor.{ Actor, PoisonPill, ActorSystem }
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// import Actor._
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// import java.util.concurrent.CountDownLatch
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// import akka.routing.Routing.Broadcast
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// import akka.routing.{ RoutedProps, Routing }
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object Pi extends App {
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// object Pi extends App {
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val system = ActorSystem()
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// val system = ActorSystem()
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// Initiate the calculation
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calculate(nrOfWorkers = 4, nrOfElements = 10000, nrOfMessages = 10000)
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// calculate(nrOfWorkers = 4, nrOfElements = 10000, nrOfMessages = 10000)
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// ====================
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// ===== Messages =====
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// ====================
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sealed trait PiMessage
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// // ====================
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// // ===== Messages =====
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// // ====================
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// sealed trait PiMessage
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case object Calculate extends PiMessage
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// case object Calculate extends PiMessage
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case class Work(start: Int, nrOfElements: Int) extends PiMessage
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// case class Work(start: Int, nrOfElements: Int) extends PiMessage
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case class Result(value: Double) extends PiMessage
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// case class Result(value: Double) extends PiMessage
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// ==================
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// ===== Worker =====
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// ==================
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class Worker extends Actor {
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// // ==================
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// // ===== Worker =====
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// // ==================
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// class Worker extends Actor {
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// define the work
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def calculatePiFor(start: Int, nrOfElements: Int): Double = {
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var acc = 0.0
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for (i ← start until (start + nrOfElements))
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acc += 4.0 * (1 - (i % 2) * 2) / (2 * i + 1)
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acc
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}
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// // define the work
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// def calculatePiFor(start: Int, nrOfElements: Int): Double = {
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// var acc = 0.0
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// for (i ← start until (start + nrOfElements))
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// acc += 4.0 * (1 - (i % 2) * 2) / (2 * i + 1)
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// acc
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// }
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def receive = {
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case Work(start, nrOfElements) ⇒ sender ! Result(calculatePiFor(start, nrOfElements)) // perform the work
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}
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}
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// def receive = {
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// case Work(start, nrOfElements) ⇒ sender ! Result(calculatePiFor(start, nrOfElements)) // perform the work
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// }
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// }
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// ==================
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// ===== Master =====
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// ==================
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class Master(nrOfWorkers: Int, nrOfMessages: Int, nrOfElements: Int, latch: CountDownLatch)
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extends Actor {
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// // ==================
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// // ===== Master =====
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// // ==================
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// class Master(nrOfWorkers: Int, nrOfMessages: Int, nrOfElements: Int, latch: CountDownLatch)
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// extends Actor {
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var pi: Double = _
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var nrOfResults: Int = _
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var start: Long = _
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// var pi: Double = _
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// var nrOfResults: Int = _
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// var start: Long = _
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// create the workers
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val workers = Vector.fill(nrOfWorkers)(system.actorOf[Worker])
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// // create the workers
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// val workers = Vector.fill(nrOfWorkers)(system.actorOf[Worker])
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// wrap them with a load-balancing router
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val props = RoutedProps(routerFactory = () ⇒ new RoundRobinRouter, connectionManager = new LocalConnectionManager(workers))
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val router = new RoutedActorRef(system, props, self, "pi")
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// // wrap them with a load-balancing router
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// val router = system.actorOf(RoutedProps().withRoundRobinRouter.withLocalConnections(workers), "pi")
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// message handler
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def receive = {
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case Calculate ⇒
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// schedule work
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for (i ← 0 until nrOfMessages) router ! Work(i * nrOfElements, nrOfElements)
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case Result(value) ⇒
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// handle result from the worker
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pi += value
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nrOfResults += 1
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// // message handler
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// def receive = {
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// case Calculate ⇒
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// // schedule work
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// for (i ← 0 until nrOfMessages) router ! Work(i * nrOfElements, nrOfElements)
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// Stop this actor and all its supervised children
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if (nrOfResults == nrOfMessages) self.stop()
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}
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// // send a PoisonPill to all workers telling them to shut down themselves
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// router ! Broadcast(PoisonPill)
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override def preStart() {
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start = System.currentTimeMillis
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}
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// // send a PoisonPill to the router, telling him to shut himself down
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// router ! PoisonPill
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override def postStop() {
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// tell the world that the calculation is complete
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println(
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"\n\tPi estimate: \t\t%s\n\tCalculation time: \t%s millis"
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.format(pi, (System.currentTimeMillis - start)))
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latch.countDown()
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}
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}
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// case Result(value) ⇒
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// // handle result from the worker
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// pi += value
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// nrOfResults += 1
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// if (nrOfResults == nrOfMessages) self.stop()
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// }
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object Master {
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val impl = system.asInstanceOf[ActorSystemImpl]
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}
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// override def preStart() {
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// start = System.currentTimeMillis
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// }
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// ==================
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// ===== Run it =====
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// ==================
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def calculate(nrOfWorkers: Int, nrOfElements: Int, nrOfMessages: Int) {
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// override def postStop() {
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// // tell the world that the calculation is complete
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// println(
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// "\n\tPi estimate: \t\t%s\n\tCalculation time: \t%s millis"
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// .format(pi, (System.currentTimeMillis - start)))
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// latch.countDown()
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// }
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// }
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// this latch is only plumbing to know when the calculation is completed
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val latch = new CountDownLatch(1)
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// // ==================
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// // ===== Run it =====
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// // ==================
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// def calculate(nrOfWorkers: Int, nrOfElements: Int, nrOfMessages: Int) {
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// create the master
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val master = system.actorOf(new Master(nrOfWorkers, nrOfMessages, nrOfElements, latch))
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// // this latch is only plumbing to know when the calculation is completed
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// val latch = new CountDownLatch(1)
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// start the calculation
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master ! Calculate
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// // create the master
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// val master = system.actorOf(new Master(nrOfWorkers, nrOfMessages, nrOfElements, latch))
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// wait for master to shut down
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latch.await()
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// // start the calculation
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// master ! Calculate
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// // wait for master to shut down
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// latch.await()
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// }
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// }
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// Shut down the system
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system.stop()
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}
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}
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