From 87396a8b3a2464b7e5b334f9592bf2100830846c Mon Sep 17 00:00:00 2001
From: Heiko Seeberger <hseeberger@users.noreply.github.com>
Date: Thu, 11 May 2017 10:40:38 +0200
Subject: [PATCH] Avoid overflow of index

---
 src/main/scala/blog/typed/scaladsl/ImmutableRoundRobin.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/blog/typed/scaladsl/ImmutableRoundRobin.scala b/src/main/scala/blog/typed/scaladsl/ImmutableRoundRobin.scala
index fe1f73c..48a343a 100644
--- a/src/main/scala/blog/typed/scaladsl/ImmutableRoundRobin.scala
+++ b/src/main/scala/blog/typed/scaladsl/ImmutableRoundRobin.scala
@@ -19,7 +19,7 @@ object ImmutableRoundRobin {
 
   private def activeRoutingBehavior[T](index: Long, workers: Vector[ActorRef[T]]): Behavior[T] =
     Actor.immutable[T] { (ctx, msg) =>
-      workers((index % workers.size).toInt) ! msg
+      workers(abs(index % workers.size).toInt) ! msg
       activeRoutingBehavior(index + 1, workers)
     }
 }