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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2016. 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.
%%
%% %CopyrightEnd%
%%
-module(alarm_handler).
%%%-----------------------------------------------------------------
%%% This is the SASL alarm handler process.
%%% It is a gen_event process. When it is started, a simple
%%% event handler which logs all alarms is installed.
%%%-----------------------------------------------------------------
-export([start_link/0, set_alarm/1, clear_alarm/1, get_alarms/0,
add_alarm_handler/1, add_alarm_handler/2,
delete_alarm_handler/1]).
-export([init/1,
handle_event/2, handle_call/2, handle_info/2,
terminate/2]).
start_link() ->
case gen_event:start_link({local, alarm_handler}) of
{ok, Pid} ->
gen_event:add_handler(alarm_handler, alarm_handler, []),
{ok, Pid};
Error -> Error
end.
%%-----------------------------------------------------------------
%% Func: set_alarm/1
%% Args: Alarm ::= {AlarmId, term()}
%% where AlarmId ::= term()
%%-----------------------------------------------------------------
set_alarm(Alarm) ->
gen_event:notify(alarm_handler, {set_alarm, Alarm}).
%%-----------------------------------------------------------------
%% Func: clear_alarm/1
%% Args: AlarmId ::= term()
%%-----------------------------------------------------------------
clear_alarm(AlarmId) ->
gen_event:notify(alarm_handler, {clear_alarm, AlarmId}).
%%-----------------------------------------------------------------
%% Func: get_alarms/0
%% Returns: [{AlarmId, AlarmDesc}]
%%-----------------------------------------------------------------
get_alarms() ->
gen_event:call(alarm_handler, alarm_handler, get_alarms).
add_alarm_handler(Module) when is_atom(Module) ->
gen_event:add_handler(alarm_handler, Module, []).
add_alarm_handler(Module, Args) when is_atom(Module) ->
gen_event:add_handler(alarm_handler, Module, Args).
delete_alarm_handler(Module) when is_atom(Module) ->
gen_event:delete_handler(alarm_handler, Module, []).
%%-----------------------------------------------------------------
%% Default Alarm handler
%%-----------------------------------------------------------------
init(_) -> {ok, []}.
handle_event({set_alarm, Alarm}, Alarms)->
error_logger:info_report([{alarm_handler, {set, Alarm}}]),
{ok, [Alarm | Alarms]};
handle_event({clear_alarm, AlarmId}, Alarms)->
error_logger:info_report([{alarm_handler, {clear, AlarmId}}]),
{ok, lists:keydelete(AlarmId, 1, Alarms)};
handle_event(_, Alarms)->
{ok, Alarms}.
handle_info(_, Alarms) -> {ok, Alarms}.
handle_call(get_alarms, Alarms) -> {ok, Alarms, Alarms};
handle_call(_Query, Alarms) -> {ok, {error, bad_query}, Alarms}.
terminate(swap, Alarms) ->
{alarm_handler, Alarms};
terminate(_, _) ->
ok.
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