update

Former-commit-id: bdede6ed1b6f578f2ef046c338caf02d0b29d453 [formerly 7187de361b53e9c8ec121df379b762f2db736ea2]
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_embed/public/ace/demo/kitchen-sink/docs/scala.scala

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+// http://www.scala-lang.org/node/54
+
+package examples.actors
+
+import scala.actors.Actor
+import scala.actors.Actor._
+
+abstract class PingMessage
+case object Start extends PingMessage
+case object SendPing extends PingMessage
+case object Pong extends PingMessage
+
+abstract class PongMessage
+case object Ping extends PongMessage
+case object Stop extends PongMessage
+
+object pingpong extends Application {
+  val pong = new Pong
+  val ping = new Ping(100000, pong)
+  ping.start
+  pong.start
+  ping ! Start
+}
+
+class Ping(count: Int, pong: Actor) extends Actor {
+  def act() {
+    println("Ping: Initializing with count "+count+": "+pong)
+    var pingsLeft = count
+    loop {
+      react {
+        case Start =>
+          println("Ping: starting.")
+          pong ! Ping
+          pingsLeft = pingsLeft - 1
+        case SendPing =>
+          pong ! Ping
+          pingsLeft = pingsLeft - 1
+        case Pong =>
+          if (pingsLeft % 1000 == 0)
+            println("Ping: pong from: "+sender)
+          if (pingsLeft > 0)
+            self ! SendPing
+          else {
+            println("Ping: Stop.")
+            pong ! Stop
+            exit('stop)
+          }
+      }
+    }
+  }
+}
+
+class Pong extends Actor {
+  def act() {
+    var pongCount = 0
+    loop {
+      react {
+        case Ping =>
+          if (pongCount % 1000 == 0)
+            println("Pong: ping "+pongCount+" from "+sender)
+          sender ! Pong
+          pongCount = pongCount + 1
+        case Stop =>
+          println("Pong: Stop.")
+          exit('stop)
+      }
+    }
+  }
+}