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%%% Textgroup server. |
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%%% |
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%%% Copyright (c) 2022 Holger Weiss <holger@zedat.fu-berlin.de>. |
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%%% 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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-module(textgroup_app). |
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-behaviour(application). |
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-export([start/2, |
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prep_stop/1, |
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stop/1, |
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config_change/3]). |
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-include_lib("kernel/include/logger.hrl"). |
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%% API. |
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-spec start(application:start_type(), any()) -> {ok, pid()} | {error, term()}. |
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start(_StartType, _StartArgs) -> |
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?LOG_NOTICE("Starting Textgroup ~s on Erlang/OTP ~s (ERTS ~s)", |
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[version(), |
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erlang:system_info(otp_release), |
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:-( |
erlang:system_info(version)]), |
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case textgroup_sup:start_link() of |
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{ok, _PID} = Result -> |
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ok = textgroup_systemd:ready(), |
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Result; |
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{error, _Reason} = Err -> |
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:-( |
Err |
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end. |
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-spec prep_stop(term()) -> term(). |
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prep_stop(State) -> |
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ok = textgroup_systemd:stopping(), |
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State. |
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-spec stop(term()) -> ok. |
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stop(_State) -> |
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?LOG_NOTICE("Stopping Textgroup ~s on Erlang/OTP ~s (ERTS ~s)", |
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[version(), |
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erlang:system_info(otp_release), |
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:-( |
erlang:system_info(version)]), |
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ok. |
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-spec config_change([{atom(), term()}], [{atom(), term()}], [atom()]) -> ok. |
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config_change(Changed, _New, _Removed) -> |
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ReopenSocket = lists:any(fun({Key, _Val}) -> |
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lists:member(Key, [port, pool_size]) |
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end, Changed), |
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case ReopenSocket of |
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true -> % Deliberately hit max. restart intensity to start new listener: |
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lists:foreach( |
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fun({_, PID, _, [textgroup_acceptor]}) -> |
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exit(PID, kill) |
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end, supervisor:which_children(textgroup_acceptor_sup)); |
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false -> |
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:-( |
ok |
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end. |
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%% Internal functions. |
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-spec version() -> binary(). |
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version() -> |
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{ok, Version} = application:get_key(vsn), |
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unicode:characters_to_binary(Version). |