Taking FeederActor out as seperate program

examples/src/main/scala/spark/streaming/examples/ActorWordCount.scala

@@ -49,25 +49,24 @@ class FeederActor extends Actor {
 
     case SubscribeReceiver(receiverActor: ActorRef) =>
       println("received subscribe from %s".format(receiverActor.toString))
-      receivers = LinkedList(receiverActor) ++ receivers
+    receivers = LinkedList(receiverActor) ++ receivers
 
     case UnsubscribeReceiver(receiverActor: ActorRef) =>
       println("received unsubscribe from %s".format(receiverActor.toString))
-      receivers = receivers.dropWhile(x => x eq receiverActor)
+    receivers = receivers.dropWhile(x => x eq receiverActor)
 
   }
 }
 
 /**
- * A sample actor as receiver is also simplest. This receiver actor
+ * A sample actor as receiver, is also simplest. This receiver actor
  * goes and subscribe to a typical publisher/feeder actor and receives
- * data, thus it is important to have feeder running before this example
- * can be run.
+ * data.
  *
  * @see [[spark.streaming.examples.FeederActor]]
  */
 class SampleActorReceiver[T: ClassManifest](urlOfPublisher: String)
-  extends Actor with Receiver {
+extends Actor with Receiver {
 
   lazy private val remotePublisher = context.actorFor(urlOfPublisher)
 
@@ -81,13 +80,42 @@ class SampleActorReceiver[T: ClassManifest](urlOfPublisher: String)
 
 }
 
+/**
+ * A sample feeder actor
+ *
+ * Usage: FeederActor <hostname> <port>
+ *   <hostname> and <port> describe the AkkaSystem that Spark Sample feeder would start on.
+ */
+object FeederActor {
+
+  def main(args: Array[String]) {
+    if(args.length < 2){
+      System.err.println(
+        "Usage: FeederActor <hostname> <port>\n"
+      )
+      System.exit(1)
+    }
+    val Seq(host, port) = args.toSeq
+
+
+    val actorSystem = AkkaUtils.createActorSystem("test", host, port.toInt)._1
+    val feeder = actorSystem.actorOf(Props[FeederActor], "FeederActor")
+
+    println("Feeder started as:" + feeder)
+
+    actorSystem.awaitTermination();
+  }
+}
+
 /**
  * A sample word count program demonstrating the use of plugging in
  * Actor as Receiver
  * Usage: ActorWordCount <master> <hostname> <port>
  *   <master> is the Spark master URL. In local mode, <master> should be 'local[n]' with n > 1.
- *   <hostname> and <port> describe the AkkaSystem that Spark Sample feeder would work on.
- * 
+ *   <hostname> and <port> describe the AkkaSystem that Spark Sample feeder is running on.
+ *
+ * To run this example locally, you may run Feeder Actor as
+ *    `$ ./run spark.streaming.examples.FeederActor 127.0.1.1 9999`
  * and then run the example
  *    `$ ./run spark.streaming.examples.ActorWordCount local[2] 127.0.1.1 9999`
  */
@@ -96,7 +124,7 @@ object ActorWordCount {
     if (args.length < 3) {
       System.err.println(
         "Usage: ActorWordCount <master> <hostname> <port>" +
-          "In local mode, <master> should be 'local[n]' with n > 1")
+        "In local mode, <master> should be 'local[n]' with n > 1")
       System.exit(1)
     }
 
@@ -104,21 +132,16 @@ object ActorWordCount {
 
     // Create the context and set the batch size
     val ssc = new StreamingContext(master, "ActorWordCount",
-      Seconds(10))
+                                   Seconds(10))
 
-    //Start feeder actor on this actor system. 
-    val actorSystem = AkkaUtils.createActorSystem("test", host, port.toInt)._1
-
-    val feeder = actorSystem.actorOf(Props[FeederActor], "FeederActor")
-
-    /* 
+    /*
      * Following is the use of actorStream to plug in custom actor as receiver
-     * 
+     *
      * An important point to note:
-     * Since Actor may exist outside the spark framework, It is thus user's responsibility 
-     * to ensure the type safety, i.e type of data received and InputDstream 
+     * Since Actor may exist outside the spark framework, It is thus user's responsibility
+     * to ensure the type safety, i.e type of data received and InputDstream
      * should be same.
-     * 
+     *
      * For example: Both actorStream and SampleActorReceiver are parameterized
      * to same type to ensure type safety.
      */
@@ -127,10 +150,9 @@ object ActorWordCount {
       Props(new SampleActorReceiver[String]("akka://spark@%s:%s/user/FeederActor".format(
         host, port.toInt))), "SampleReceiver")
 
-    //compute wordcount 
+    //compute wordcount
     lines.flatMap(_.split("\\s+")).map(x => (x, 1)).reduceByKey(_ + _).print()
 
     ssc.start()
-
   }
 }