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Incorporated feedback on tutorial text plus added sections on SBT and some other stuff here and there

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This commit is contained in:
Jonas Bonér 2011-04-09 14:26:52 +02:00
parent c91d746532
commit 3976e3012b
2 changed files with 101 additions and 61 deletions
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32
akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala
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@ -13,8 +13,6 @@ import akka.dispatch.Dispatchers
import System.{currentTimeMillis => now}
import java.util.concurrent.CountDownLatch
import scala.annotation.tailrec
/**
* First part in Akka tutorial.
* <p/>
@ -57,26 +55,13 @@ object Pi extends App {
// ===== Worker =====
// ==================
class Worker extends Actor {
// define the work
/*
// FIXME tail-recursive fun instead
val calculatePiFor = (arg: Int, nrOfElements: Int) => {
val range = (arg * nrOfElements) until ((arg + 1) * nrOfElements)
var acc = 0.0D
range foreach (i => acc += 4 * math.pow(-1, i) / (2 * i + 1))
// define the work
def calculatePiFor(start: Int, elems: Int): Double = {
var acc = 0.0
for (i <- start until (start + elems))
acc += 4 * math.pow(-1, i) / (2 * i + 1)
acc
// Use this for more functional style but is twice as slow
// range.foldLeft(0.0D)( (acc, i) => acc + 4 * math.pow(-1, i) / (2 * i + 1) )
}
*/
def calculatePiFor(arg: Int, nrOfElements: Int): Double = {
val end = (arg + 1) * nrOfElements
@tailrec def doCalculatePiFor(cursor: Int, acc: Double): Double = {
if (cursor == end) acc
else doCalculatePiFor(cursor + 1, acc + (4 * math.pow(-1, cursor) / (2 * cursor + 1)))
}
doCalculatePiFor(arg * nrOfElements, 0.0D)
}
def receive = {
@ -88,7 +73,9 @@ object Pi extends App {
// ==================
// ===== Master =====
// ==================
class Master(nrOfWorkers: Int, nrOfMessages: Int, nrOfElements: Int, latch: CountDownLatch) extends Actor {
class Master(nrOfWorkers: Int, nrOfMessages: Int, nrOfElements: Int, latch: CountDownLatch)
extends Actor {
var pi: Double = _
var nrOfResults: Int = _
var start: Long = _
@ -103,7 +90,8 @@ object Pi extends App {
def receive = {
case Calculate =>
// schedule work
for (arg <- 0 until nrOfMessages) router ! Work(arg, nrOfElements)
//for (arg <- 0 until nrOfMessages) router ! Work(arg, nrOfElements)
for (i <- 0 until nrOfMessages) router ! Work(i * nrOfElements, nrOfElements)
// send a PoisonPill to all workers telling them to shut down themselves
router ! Broadcast(PoisonPill)