From 74a10f88ec3a890756f053a2d39ef37b8e7f4630 Mon Sep 17 00:00:00 2001
From: Diana Corbacho <diana@rabbitmq.com>
Date: Mon, 12 Jun 2017 17:05:26 +0100
Subject: [PATCH] Add lock and unlock to peer discovery backend

rabbitmq-server#1257
[#146871615]
---
 src/rabbit_peer_discovery_backend.erl | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/rabbit_peer_discovery_backend.erl b/src/rabbit_peer_discovery_backend.erl
index 0ab11597..560ecdf6 100644
--- a/src/rabbit_peer_discovery_backend.erl
+++ b/src/rabbit_peer_discovery_backend.erl
@@ -48,3 +48,7 @@
 -callback unregister() -> ok | {error, Reason :: string()}.
 
 -callback post_registration()   -> ok | {error, Reason :: string()}.
+
+-callback lock(Node :: atom())   -> {ok, Data :: term()} | not_supported | {error, Reason :: string()}.
+
+-callback unlock(Data :: term()) -> ok | {error, Reason :: string()}.