77 lines
2.5 KiB
Erlang
77 lines
2.5 KiB
Erlang
%%--------------------------------------------------------------------
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%% Copyright (c) 2021-2023 EMQ Technologies Co., Ltd. All Rights Reserved.
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%%
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%% Licensed under the Apache License, Version 2.0 (the "License");
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%% you may not use this file except in compliance with the License.
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%% You may obtain a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing, software
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%% distributed under the License is distributed on an "AS IS" BASIS,
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% See the License for the specific language governing permissions and
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%% limitations under the License.
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%%--------------------------------------------------------------------
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%%%-------------------------------------------------------------------
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%% @doc emqx_statsd top level supervisor.
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%% @end
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%%%-------------------------------------------------------------------
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-module(emqx_statsd_sup).
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-behaviour(supervisor).
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-export([
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start_link/0,
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ensure_child_started/1,
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ensure_child_stopped/1
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]).
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-export([init/1]).
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%% Helper macro for declaring children of supervisor
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-define(CHILD(Mod, Opts), #{
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id => Mod,
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start => {Mod, start_link, Opts},
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restart => permanent,
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shutdown => 5000,
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type => worker,
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modules => [Mod]
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}).
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start_link() ->
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supervisor:start_link({local, ?MODULE}, ?MODULE, []).
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-spec ensure_child_started(atom()) -> ok.
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ensure_child_started(Mod) when is_atom(Mod) ->
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assert_started(supervisor:start_child(?MODULE, ?CHILD(Mod, []))).
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%% @doc Stop the child worker process.
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-spec ensure_child_stopped(any()) -> ok.
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ensure_child_stopped(ChildId) ->
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case supervisor:terminate_child(?MODULE, ChildId) of
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ok ->
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%% with terminate_child/2 returned 'ok', it's not possible
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%% for supervisor:delete_child/2 to return {error, Reason}
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ok = supervisor:delete_child(?MODULE, ChildId);
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{error, not_found} ->
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ok
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end.
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init([]) ->
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Children =
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case emqx_conf:get([statsd, enable], false) of
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true -> [?CHILD(emqx_statsd, [])];
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false -> []
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end,
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{ok, {{one_for_one, 100, 3600}, Children}}.
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%%--------------------------------------------------------------------
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%% Internal functions
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%%--------------------------------------------------------------------
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assert_started({ok, _Pid}) -> ok;
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assert_started({error, {already_started, _Pid}}) -> ok;
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assert_started({error, Reason}) -> erlang:error(Reason).
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