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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2021 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(background_gc).
-behaviour(gen_server2).
-export([start_link/0, run/0]).
-export([gc/0]). %% For run_interval only
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(MAX_RATIO, 0.01).
-define(MAX_INTERVAL, 240000).
-record(state, {last_interval}).
%%----------------------------------------------------------------------------
-spec start_link() -> {'ok', pid()} | {'error', any()}.
start_link() -> gen_server2:start_link({local, ?MODULE}, ?MODULE, [],
[{timeout, infinity}]).
-spec run() -> 'ok'.
run() -> gen_server2:cast(?MODULE, run).
%%----------------------------------------------------------------------------
init([]) ->
{ok, IdealInterval} = application:get_env(rabbit, background_gc_target_interval),
{ok, interval_gc(#state{last_interval = IdealInterval})}.
handle_call(Msg, _From, State) ->
{stop, {unexpected_call, Msg}, {unexpected_call, Msg}, State}.
handle_cast(run, State) -> gc(), {noreply, State};
handle_cast(Msg, State) -> {stop, {unexpected_cast, Msg}, State}.
handle_info(run, State) -> {noreply, interval_gc(State)};
handle_info(Msg, State) -> {stop, {unexpected_info, Msg}, State}.
code_change(_OldVsn, State, _Extra) -> {ok, State}.
terminate(_Reason, State) -> State.
%%----------------------------------------------------------------------------
interval_gc(State = #state{last_interval = LastInterval}) ->
{ok, IdealInterval} = application:get_env(rabbit, background_gc_target_interval),
{ok, Interval} = rabbit_misc:interval_operation(
{?MODULE, gc, []},
?MAX_RATIO, ?MAX_INTERVAL, IdealInterval, LastInterval),
erlang:send_after(Interval, self(), run),
State#state{last_interval = Interval}.
-spec gc() -> 'ok'.
gc() ->
Enabled = rabbit_misc:get_env(rabbit, background_gc_enabled, false),
case Enabled of
true ->
[garbage_collect(P) || P <- processes(),
{status, waiting} == process_info(P, status)],
%% since we will never be waiting...
garbage_collect();
false ->
ok
end,
ok.
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