%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License at
%% http://www.mozilla.org/MPL/
%%
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%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
%% License for the specific language governing rights and limitations
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%% The Original Code is RabbitMQ.
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%% The Initial Developer of the Original Code is Pivotal Software, Inc.
%% Copyright (c) 2007-2017 Pivotal Software, Inc.  All rights reserved.
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-type callback_result() :: 'ok' | {'stop', any()} | {'become', atom(), args()}.
-type args() :: any().
-type members() :: [pid()].

-spec joined(args(), members())                    -> callback_result().
-spec members_changed(args(), members(),members()) -> callback_result().
-spec handle_msg(args(), pid(), any())             -> callback_result().
-spec handle_terminate(args(), term())             -> any().
