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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 Federation.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2017 Pivotal Software, Inc. All rights reserved.
%%
-module(rabbit_federation_exchange_link_sup_sup).
-behaviour(mirrored_supervisor).
-include_lib("rabbit_common/include/rabbit.hrl").
-define(SUPERVISOR, ?MODULE).
%% Supervises the upstream links for all exchanges (but not queues). We need
%% different handling here since exchanges want a mirrored sup.
-export([start_link/0, start_child/1, adjust/1, stop_child/1]).
-export([init/1]).
%%----------------------------------------------------------------------------
start_link() ->
mirrored_supervisor:start_link({local, ?SUPERVISOR}, ?SUPERVISOR,
fun rabbit_misc:execute_mnesia_transaction/1,
?MODULE, []).
%% Note that the next supervisor down, rabbit_federation_link_sup, is common
%% between exchanges and queues.
start_child(X) ->
case mirrored_supervisor:start_child(
?SUPERVISOR,
{id(X), {rabbit_federation_link_sup, start_link, [X]},
transient, ?SUPERVISOR_WAIT, supervisor,
[rabbit_federation_link_sup]}) of
{ok, _Pid} -> ok;
%% A link returned {stop, gone}, the link_sup shut down, that's OK.
{error, {shutdown, _}} -> ok
end.
adjust(Reason) ->
[rabbit_federation_link_sup:adjust(Pid, X, Reason) ||
{X, Pid, _, _} <- mirrored_supervisor:which_children(?SUPERVISOR)],
ok.
stop_child(X) ->
ok = mirrored_supervisor:terminate_child(?SUPERVISOR, id(X)),
ok = mirrored_supervisor:delete_child(?SUPERVISOR, id(X)).
%%----------------------------------------------------------------------------
init([]) ->
{ok, {{one_for_one, 1200, 60}, []}}.
%% See comment in rabbit_federation_queue_link_sup_sup:id/1
id(X = #exchange{policy = Policy}) -> X1 = rabbit_exchange:immutable(X),
X1#exchange{policy = Policy}.
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