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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) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(delegate_sup).
-behaviour(supervisor).
-export([start_link/1, count/1]).
-export([init/1]).
-define(SERVER, ?MODULE).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(start_link/1 :: (integer()) -> rabbit_types:ok_pid_or_error()).
-spec(count/1 :: ([node()]) -> integer()).
-endif.
%%----------------------------------------------------------------------------
start_link(Count) ->
supervisor:start_link({local, ?SERVER}, ?MODULE, [Count]).
count([]) ->
1;
count([Node | Nodes]) ->
try
length(supervisor:which_children({?SERVER, Node}))
catch exit:{{R, _}, _} when R =:= nodedown; R =:= shutdown ->
count(Nodes);
exit:{R, _} when R =:= noproc; R =:= normal; R =:= shutdown;
R =:= nodedown ->
count(Nodes)
end.
%%----------------------------------------------------------------------------
init([Count]) ->
{ok, {{one_for_one, 10, 10},
[{Num, {delegate, start_link, [Num]},
transient, 16#ffffffff, worker, [delegate]} ||
Num <- lists:seq(0, Count - 1)]}}.
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