From 5daeac083c3178d480464e83b1b4befffffbcf9c Mon Sep 17 00:00:00 2001
From: Feng <ery.lee@gmail.com>
Date: Tue, 13 Oct 2015 21:03:25 +0800
Subject: [PATCH] spec

---
 src/emqttd_keepalive.erl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/emqttd_keepalive.erl b/src/emqttd_keepalive.erl
index e06382207..6b9042d13 100644
--- a/src/emqttd_keepalive.erl
+++ b/src/emqttd_keepalive.erl
@@ -34,10 +34,13 @@
                     tsec, tmsg, tref,
                     repeat = 0}).
 
+-type keepalive() :: #keepalive{}.
+
 %%------------------------------------------------------------------------------
 %% @doc Start a keepalive
 %% @end
 %%------------------------------------------------------------------------------
+-spec start(fun(), integer(), any()) -> undefined | keepalive().
 start(_, 0, _) ->
     undefined;
 start(StatFun, TimeoutSec, TimeoutMsg) ->
@@ -50,6 +53,7 @@ start(StatFun, TimeoutSec, TimeoutMsg) ->
 %% @doc Check keepalive, called when timeout.
 %% @end
 %%------------------------------------------------------------------------------
+-spec check(keepalive()) -> {ok, keepalive()} | {error, any()}.
 check(KeepAlive = #keepalive{statfun = StatFun, statval = LastVal, repeat = Repeat}) ->
     case StatFun() of
         {ok, NewVal} ->
@@ -71,6 +75,7 @@ resume(KeepAlive = #keepalive{tsec = TimeoutSec, tmsg = TimeoutMsg}) ->
 %% @doc Cancel Keepalive
 %% @end
 %%------------------------------------------------------------------------------
+-spec cancel(keepalive()) -> ok.
 cancel(#keepalive{tref = TRef}) ->
     cancel(TRef);
 cancel(undefined) ->