emqx4.3/src/emqttd_mod_sup.erl

%%--------------------------------------------------------------------
%% Copyright (c) 2013-2018 EMQ Enterprise, Inc. (http://emqtt.io)
%%
%% 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
%% limitations under the License.
%%--------------------------------------------------------------------

-module(emqttd_mod_sup).

-behaviour(supervisor).

-include("emqttd.hrl").

%% API
-export([start_link/0, start_child/1, start_child/2, stop_child/1]).

%% Supervisor callbacks
-export([init/1]).

%% Helper macro for declaring children of supervisor
-define(CHILD(Mod, Type), {Mod, {Mod, start_link, []}, permanent, 5000, Type, [Mod]}).

%%--------------------------------------------------------------------
%% API
%%--------------------------------------------------------------------

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

start_child(ChildSpec) when is_tuple(ChildSpec) ->
    supervisor:start_child(?MODULE, ChildSpec).

start_child(Mod, Type) when is_atom(Mod) andalso is_atom(Type) ->
    supervisor:start_child(?MODULE, ?CHILD(Mod, Type)).

-spec(stop_child(any()) -> ok | {error, term()}).
stop_child(ChildId) ->
    case supervisor:terminate_child(?MODULE, ChildId) of
        ok    -> supervisor:delete_child(?MODULE, ChildId);
        Error -> Error
    end.

%%--------------------------------------------------------------------
%% Supervisor callbacks
%%--------------------------------------------------------------------

init([]) ->
    {ok, {{one_for_one, 10, 100}, []}}.