build.sbt：
name := "HelloAkkaWithSBT"
version := "1.0"
scalaVersion := "2.9.2"
resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases"
libraryDependencies += "com.typesafe.akka" % "akka-actor" % "2.0.3"
MasterActor：
class MasterActor extends Actor{
val aggregateActor : ActorRef = context.actorOf(Props[AggregateActor], name = "aggregate")
val reduceActor : ActorRef = context.actorOf(Props(new ReduceActor(aggregateActor)), name = "reduce")
val mapActor : ActorRef = context.actorOf(Props(new MapActor(reduceActor)), "map")
override protected def receive: Receive = {
case message : String =>
mapActor ! message
case message : Result =>
aggregateActor ! message
case _ =>
}
}
MapActor：
class MapActor(reduceActor: ActorRef) extends Actor{
val STOP_WORDS_LIST = List("a", "is")
override protected def receive: Receive = {
case message : String =>
reduceActor ! map(message)
case _ =>
}
def map(line : String): MapData = {
val dataList = new util.ArrayList[Word]
val parser : StringTokenizer = new StringTokenizer(line)
val defaultCount : Integer = 1;
while(parser.hasMoreTokens){
val word : String = parser.nextToken().toLowerCase()
if(!STOP_WORDS_LIST.contains(word)){
dataList.add(new Word(word, defaultCount))
}
}
return new MapData(dataList)
}
}
ReduceActor：
class ReduceActor(aggregateActor : ActorRef) extends Actor{
override protected def receive: Receive = {
case message : MapData =>
aggregateActor ! reduce(message.dataList)
case _ =>
}
def reduce(dataList: util.ArrayList[Word]): ReduceData = {
val reduceMap = new util.HashMap[String, Integer]
if(!dataList.isEmpty()){
for(wc : Word <- dataList){
val word = wc.word
if(reduceMap.containsKey(word)){
reduceMap.put(word, reduceMap.get(word) + 1)
}else{
reduceMap.put(word, 1)
}
}
}
return new ReduceData(reduceMap)
}
}
AggregateActor：
class AggregateActor extends Actor{
val finalReduceMap = new util.HashMap[String, Integer]
override protected def receive: Receive = {
case message : ReduceData =>
aggregate(message.reduceMap)
case message : Result =>
println(finalReduceMap.toString)
}
def aggregate(reduceMap: util.HashMap[String, Integer]): Unit = {
var count : Integer = 0
for(key : String <- reduceMap.keySet()){
if(finalReduceMap.containsKey(key)){
count = reduceMap.get(key)
count += finalReduceMap.get(key)
finalReduceMap.put(key, count)
}else{
finalReduceMap.put(key, reduceMap.get(key))
}
}
}
}
入口：
object MapReduceApplication {
def main (args: Array[String]){
val _system = ActorSystem("HelloAkka")
val master = _system.actorOf(Props[MasterActor], name = "master")
master ! "Hi! My name is Rocky. I'm so so so happy to be here."
master ! "Today, I'm going to read a news article for you."
master ! "I hope I hope you'll like it."
Thread.sleep(500)
master ! new Result
Thread.sleep(500);
_system.shutdown()
}
}
SBT运行结果：
图片发自App