Merge pull request #1953 from akka/wip-3102-remove-ComposableActor-patriknw

=doc #3102 Remove ComposableActor doc sample

akka-docs/rst/scala/code/docs/actor/ActorDocSpec.scala

@@ -583,59 +583,4 @@ class ActorDocSpec extends AkkaSpec(Map("akka.loglevel" -> "INFO")) {
     })
   }
 
-  //#receive-orElse2
-  class PartialFunctionBuilder[A, B] {
-    import scala.collection.immutable.Vector
-
-    // Abbreviate to make code fit
-    type PF = PartialFunction[A, B]
-
-    private var pfsOption: Option[Vector[PF]] = Some(Vector.empty)
-
-    private def mapPfs[C](f: Vector[PF] => (Option[Vector[PF]], C)): C = {
-      pfsOption.fold(throw new IllegalStateException("Already built"))(f) match {
-        case (newPfsOption, result) => {
-          pfsOption = newPfsOption
-          result
-        }
-      }
-    }
-
-    def +=(pf: PF): Unit =
-      mapPfs { case pfs => (Some(pfs :+ pf), ()) }
-
-    def result(): PF =
-      mapPfs { case pfs => (None, pfs.foldLeft[PF](Map.empty) { _ orElse _ }) }
-  }
-
-  trait ComposableActor extends Actor {
-    protected lazy val receiveBuilder = new PartialFunctionBuilder[Any, Unit]
-    final def receive = receiveBuilder.result()
-  }
-
-  trait TheirComposableActor extends ComposableActor {
-    receiveBuilder += {
-      case "foo" => sender() ! "foo received"
-    }
-  }
-
-  class MyComposableActor extends TheirComposableActor {
-    receiveBuilder += {
-      case "bar" => sender() ! "bar received"
-    }
-  }
-  //#receive-orElse2
-
-  "using ComposableActor" in {
-    val composed = system.actorOf(Props(classOf[MyComposableActor], this))
-    implicit val me = testActor
-    composed ! "foo"
-    expectMsg("foo received")
-    composed ! "bar"
-    expectMsg("bar received")
-    EventFilter.warning(pattern = ".*unhandled message from.*baz", occurrences = 1) intercept {
-      composed ! "baz"
-    }
-  }
-
 }