added Philipp's example to docs/examples/actors/

1 files changed, 41 insertions, 0 deletions

diff --git a/docs/examples/actors/Message.scala b/docs/examples/actors/Message.scala
new file mode 100644
index 0000000000..7ec1d503f9
--- /dev/null
+++ b/docs/examples/actors/Message.scala
@@ -0,0 +1,41 @@
+// Modified by Philipp Haller to use Scala's event-based actors.
+package examples.actors
+
+import scala.actors._
+import scala.actors.Actor._
+
+object Message {
+  def main(args: Array[String]) = {
+    val n = try {
+      Integer.parseInt(args(0))
+    }
+    catch {
+      case _ =>
+        scala.Console.println("Usage: examples.actors.Message <n>")
+        Predef.exit
+    }
+    val nActors = 500
+    val finalSum = n * nActors
+    Scheduler.impl = new SingleThreadedScheduler
+
+    def beh(next: Actor, sum: int): unit =
+      react {
+        case value: int =>
+          val j = value + 1; val nsum = sum + j
+          if (next == null && nsum >= finalSum) {
+            Console.println(nsum)
+            System.exit(0)
+          }
+          else {
+            if (next != null) next ! j
+            beh(next, nsum)
+          }
+      }
+
+    def actorChain(i: Int, a: Actor): Actor =
+      if (i > 0) actorChain(i-1, actor(beh(a, 0))) else a
+
+    val firstActor = actorChain(nActors, null)
+    var i = n; while (i > 0) { firstActor ! 0; i = i-1 }
+  }
+}