Cleaned-up actor examples.

1 files changed, 36 insertions, 0 deletions

diff --git a/docs/examples/actors/boundedbuffer.scala b/docs/examples/actors/boundedbuffer.scala
new file mode 100644
index 0000000000..6bc01dfe55
--- /dev/null
+++ b/docs/examples/actors/boundedbuffer.scala
@@ -0,0 +1,36 @@
+package examples.actors
+
+import scala.actors.Actor._
+
+object boundedbuffer {
+  class BoundedBuffer[T](N: int) {
+    private case class Put(x: T)
+    private case object Get
+    private case object Stop
+
+    private val buffer = actor {
+      val buf = new Array[T](N)
+      var in = 0; var out = 0; var n = 0
+      loop {
+        receive {
+          case Put(x) if n < N =>
+            buf(in) = x; in = (in + 1) % N; n = n + 1; reply()
+          case Get if n > 0 =>
+            val r = buf(out); out = (out + 1) % N; n = n - 1; reply(r)
+          case Stop => reply(); exit("stopped")
+        }
+      }
+    }
+
+    def put(x: T) { buffer !? Put(x) }
+    def get: T = (buffer !? Get).asInstanceOf[T]
+    def stop() { buffer !? Stop }
+  }
+
+  def main(args: Array[String]) = {
+    val buf = new BoundedBuffer[Int](1)
+    buf.put(42)
+    scala.Console.println("" + buf.get)
+    buf.stop()
+  }
+}