%%--------------------------------------------------------------------
%% Copyright (c) 2020-2023 EMQ Technologies Co., Ltd. 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
%% limitations under the License.
%%--------------------------------------------------------------------

-module(emqx_resource_app).

-behaviour(application).

-include("emqx_resource.hrl").

-export([start/2, stop/1]).

start(_StartType, _StartArgs) ->
    %% since the handler is generic and executed in the process
    %% emitting the event, we need to install only a single handler
    %% for the whole app.
    TelemetryHandlerID = telemetry_handler_id(),
    ok = emqx_resource_metrics:install_telemetry_handler(TelemetryHandlerID),
    emqx_resource_sup:start_link().

stop(_State) ->
    TelemetryHandlerID = telemetry_handler_id(),
    ok = emqx_resource_metrics:uninstall_telemetry_handler(TelemetryHandlerID),
    ok.

%% internal functions
telemetry_handler_id() ->
    <<"emqx-resource-app-telemetry-handler">>.