%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2015. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
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%% %CopyrightEnd%
%%

%%
%% This module implements a supervisor for external (plug-in) processes

-module(mnesia_ext_sup).
-behaviour(supervisor).

-export([start/0,
	 init/1,
	 start_proc/4, start_proc/5,
	 stop_proc/1]).

-define(SHUTDOWN, 120000).  % 2 minutes

start() ->
    supervisor:start_link({local, ?MODULE}, ?MODULE, []).

start_proc(Name, M, F, A) ->
    start_proc(Name, M, F, A, []).

start_proc(Name, M, F, A, Opts) ->
    [Restart, Shutdown, Type, Modules] =
	[proplists:get_value(K, Opts, Default)
	 || {K, Default} <- [{restart, transient},
			     {shutdown, ?SHUTDOWN},
			     {type, worker},
			     {modules, [M]}]],
    case supervisor:start_child(
	   ?MODULE, {Name, {M,F,A}, Restart, Shutdown, Type, Modules}) of
	{error, already_present} ->
	    supervisor:restart_child(?MODULE, Name);
	Other ->
	    Other
    end.

stop_proc(Name) ->
    supervisor:terminate_child(?MODULE, Name).

init(_) ->
    {ok, {{one_for_all, 10, 60}, []}}.