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%% -------------------------------------------------------------------
%% riak_core_eventhandler_guard: Guard process for persistent event handlers.
%% Copyright (c) 2007-2011 Basho Technologies, Inc. All Rights Reserved.
%% This file is provided to you 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
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%% -------------------------------------------------------------------
-export([start_link/3, start_link/4]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-record(state, {handlermod, handler, exitfun}).
start_link(HandlerMod, Handler, Args) ->
start_link(HandlerMod, Handler, Args, undefined).
start_link(HandlerMod, Handler, Args, ExitFun) ->
gen_server:start_link(?MODULE, [HandlerMod, Handler, Args, ExitFun], []).
init([HandlerMod, Handler, Args, ExitFun]) ->
ok = gen_event:add_sup_handler(HandlerMod, Handler, Args),
{ok, #state{handlermod=HandlerMod, handler=Handler, exitfun=ExitFun}}.
handle_call(_Request, _From, State) -> {reply, ok, State}.
handle_cast(_Msg, State) -> {noreply, State}.
handle_info({gen_event_EXIT, _Handler, shutdown}, State) ->
{stop, normal, State};
handle_info({gen_event_EXIT, _Handler, normal}, State) ->
{stop, normal, State};
handle_info({gen_event_EXIT, Handler, _Reason}, State=#state{exitfun=undefined}) ->
{stop, {gen_event_EXIT, Handler}, State};
handle_info({gen_event_EXIT, Handler, Reason}, State=#state{exitfun=ExitFun}) ->
ExitFun(Handler, Reason),
{stop, {gen_event_EXIT, Handler}, State};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, #state{}) ->
code_change(_OldVsn, State, _Extra) -> {ok, State}.
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