| % 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(config_listener_mon). |
| -behaviour(gen_server). |
| -vsn(1). |
| |
| |
| -export([ |
| subscribe/2, |
| start_link/2 |
| ]). |
| |
| |
| -export([ |
| init/1, |
| terminate/2, |
| handle_call/3, |
| handle_cast/2, |
| handle_info/2, |
| code_change/3 |
| ]). |
| |
| |
| -record(st, { |
| pid, |
| ref |
| }). |
| |
| |
| start_link(Module, InitSt) -> |
| proc_lib:start_link(?MODULE, init, [{self(), Module, InitSt}]). |
| |
| subscribe(Module, InitSt) -> |
| case proc_lib:start(?MODULE, init, [{self(), Module, InitSt}]) of |
| {ok, _} -> ok; |
| Else -> Else |
| end. |
| |
| init({Pid, Mod, InitSt}) -> |
| Ref = erlang:monitor(process, Pid), |
| case config_listener:start(Mod, {Mod, Pid}, {Pid, InitSt}) of |
| ok -> |
| proc_lib:init_ack({ok, self()}), |
| gen_server:enter_loop(?MODULE, [], #st{pid = Pid, ref = Ref}); |
| Else -> |
| proc_lib:init_ack(Else) |
| end. |
| |
| |
| terminate(_Reason, _St) -> |
| ok. |
| |
| |
| handle_call(_Message, _From, St) -> |
| {reply, ignored, St}. |
| |
| |
| handle_cast(_Message, St) -> |
| {noreply, St}. |
| |
| |
| handle_info({'DOWN', Ref, _, _, _}, #st{ref = Ref} = St) -> |
| {stop, normal, St}; |
| |
| handle_info({gen_event_EXIT, {config_listener, Module}, Reason}, St) -> |
| Level = case Reason of |
| normal -> debug; |
| shutdown -> debug; |
| _ -> error |
| end, |
| Fmt = "config_listener(~p) for ~p stopped with reason: ~r~n", |
| couch_log:Level(Fmt, [Module, St#st.pid, Reason]), |
| {stop, shutdown, St}; |
| |
| handle_info(_, St) -> |
| {noreply, St}. |
| |
| |
| code_change(_OldVsn, St, _Extra) -> |
| {ok, St}. |