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%% 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/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
%% License for the specific language governing rights and limitations
%% under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2010-2013 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_mirror_queue_mode).
-ifdef(use_specs).
-type(master() :: node()).
-type(slave() :: node()).
-type(params() :: any()).
-callback description() -> [proplists:property()].
%% Called whenever we think we might need to change nodes for a
%% mirrored queue. Note that this is called from a variety of
%% contexts, both inside and outside Mnesia transactions. Ideally it
%% will be pure-functional.
%%
%% Takes: parameters set in the policy,
%% current master,
%% current slaves,
%% current synchronised slaves,
%% all nodes to consider
%%
%% Returns: tuple of new master, new slaves
%%
-callback suggested_queue_nodes(
params(), master(), [slave()], [slave()], [node()]) ->
{master(), [slave()]}.
%% Are the parameters valid for this mode?
-callback validate_policy(params()) ->
rabbit_policy_validator:validate_results().
-else.
-export([behaviour_info/1]).
behaviour_info(callbacks) ->
[{description, 0}, {suggested_queue_nodes, 5}, {validate_policy, 1}];
behaviour_info(_Other) ->
undefined.
-endif.
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