eTpf/src/profile/tpRabbitHole.erl

%% Copyright (c) 2017-Present Pivotal Software, Inc.  All rights reserved.
%%
%% This package, Looking Glass, is double-licensed under the Mozilla
%% Public License 1.1 ("MPL") and the Apache License version 2
%% ("ASL"). For the MPL, please see LICENSE-MPL-RabbitMQ. For the ASL,
%% please see LICENSE-APACHE2.
%%
%% This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
%% either express or implied. See the LICENSE file for specific language governing
%% rights and limitations of this software.
%%
%% If you have any questions regarding licensing, please contact us at
%% info@rabbitmq.com.

%% The purpose of this process is to be the target of messages
%% sent by traced processes. The messages contain metadata that
%% we want to log when we are tracing and later use when profiling
%% the sending of messages. This process does not need them, it
%% just needs to exist, and therefore it discards everything.

-module(tpRabbitHole).
-behaviour(gen_server).

%% API.
-export([start_link/0]).

%% gen_server.
-export([init/1]).
-export([handle_call/3]).
-export([handle_cast/2]).
-export([handle_info/2]).
-export([terminate/2]).
-export([code_change/3]).

%% API.

-spec start_link() -> {ok, pid()}.
start_link() ->
   gen_server:start_link({local, lg}, ?MODULE, [], []).

%% gen_server.

init([]) ->
   {ok, undefined}.

handle_call(_Request, _From, State) ->
   {reply, ignored, State}.

handle_cast(_Msg, State) ->
   {noreply, State}.

handle_info(_Info, State) ->
   {noreply, State}.

terminate(_Reason, _State) ->
   ok.

code_change(_OldVsn, State, _Extra) ->
   {ok, State}.