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%% The contents of this file are subject to the Mozilla Public 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 https://www.mozilla.org/en-US/MPL/2.0/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is Pivotal Software, Inc.
%% Copyright (c) 2007-2024 Broadcom. All Rights Reserved. The term “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. All rights reserved.
%%
-module(rabbit_stream_metrics_gc).
-behaviour(gen_server).
-include("rabbit_stream_metrics.hrl").
-record(state, {timer, interval}).
-export([start_link/0]).
-export([init/1,
handle_call/3,
handle_cast/2,
handle_info/2,
terminate/2,
code_change/3]).
-spec start_link() -> rabbit_types:ok_pid_or_error().
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], [{hibernate_after, 0}]).
init(_) ->
Interval =
rabbit_misc:get_env(rabbit, core_metrics_gc_interval, 120000),
{ok, start_timer(#state{interval = Interval})}.
handle_call(which_children, _From, State) ->
{reply, [], State}.
handle_cast(_Request, State) ->
{noreply, State}.
handle_info(start_gc, State) ->
GbSet =
gb_sets:from_list(
rabbit_amqqueue:list_names()),
gc_process_and_entity(?TABLE_CONSUMER, GbSet),
gc_process_and_entity(?TABLE_PUBLISHER, GbSet),
{noreply, start_timer(State)}.
terminate(_Reason, #state{timer = TRef}) ->
_ = erlang:cancel_timer(TRef),
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
start_timer(#state{interval = Interval} = St) ->
TRef = erlang:send_after(Interval, self(), start_gc),
St#state{timer = TRef}.
gc_process_and_entity(Table, GbSet) ->
ets:foldl(fun({{Id, Pid, _} = Key, _}, none) ->
gc_process_and_entity(Id, Pid, Table, Key, GbSet)
end,
none, Table).
gc_process_and_entity(Id, Pid, Table, Key, GbSet) ->
case rabbit_misc:is_process_alive(Pid)
andalso gb_sets:is_member(Id, GbSet)
of
true ->
none;
false ->
ets:delete(Table, Key),
none
end.
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