From 35f18fd5135385be672a421e5a50a3f2fc29a208 Mon Sep 17 00:00:00 2001
From: Simon MacMullen <simon@rabbitmq.com>
Date: Wed, 11 Apr 2012 15:47:39 +0100
Subject: Deduplicate routes (needed for sender routing).

---
 src/rabbit_exchange.erl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/rabbit_exchange.erl b/src/rabbit_exchange.erl
index 39fccec3..0249155c 100644
--- a/src/rabbit_exchange.erl
+++ b/src/rabbit_exchange.erl
@@ -246,7 +246,8 @@ info_all(VHostPath, Items) -> map(VHostPath, fun (X) -> info(X, Items) end).
 route(#exchange{name = #resource{name = <<"">>, virtual_host = VHost}},
       #delivery{message = #basic_message{routing_keys = RKs}}) ->
     QNames = [rabbit_misc:r(VHost, queue, RK) || RK <- RKs],
-    [QName || #amqqueue{name = QName} <- rabbit_amqqueue:lookup(QNames)];
+    lists:usort([QName || #amqqueue{name = QName}
+                              <- rabbit_amqqueue:lookup(QNames)]);
 
 route(X = #exchange{name = XName}, Delivery) ->
     route1(Delivery, {queue:from_list([X]), XName, []}).
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