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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (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/MPL/
%%
%% 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 GoPivotal, Inc.
%% Copyright (c) 2018-2020 Pivotal Software, Inc. All rights reserved.
%%
-module(rabbit_quorum_memory_manager).
-include_lib("rabbit_common/include/rabbit.hrl").
-export([init/1, handle_call/2, handle_event/2, handle_info/2,
terminate/2, code_change/3]).
-export([register/0, unregister/0]).
-record(state, {last_roll_over,
interval}).
-rabbit_boot_step({rabbit_quorum_memory_manager,
[{description, "quorum memory manager"},
{mfa, {?MODULE, register, []}},
{cleanup, {?MODULE, unregister, []}},
{requires, rabbit_event},
{enables, recovery}]}).
register() ->
gen_event:add_handler(rabbit_alarm, ?MODULE, []).
unregister() ->
gen_event:delete_handler(rabbit_alarm, ?MODULE, []).
init([]) ->
{ok, #state{interval = interval()}}.
handle_call( _, State) ->
{ok, ok, State}.
handle_event({set_alarm, {{resource_limit, memory, Node}, []}},
#state{last_roll_over = undefined} = State) when Node == node() ->
{ok, force_roll_over(State)};
handle_event({set_alarm, {{resource_limit, memory, Node}, []}},
#state{last_roll_over = Last, interval = Interval } = State)
when Node == node() ->
Now = erlang:system_time(millisecond),
case Now > (Last + Interval) of
true ->
{ok, force_roll_over(State)};
false ->
{ok, State}
end;
handle_event(_, State) ->
{ok, State}.
handle_info(_, State) ->
{ok, State}.
terminate(_, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
force_roll_over(State) ->
ra_log_wal:force_roll_over(ra_log_wal),
State#state{last_roll_over = erlang:system_time(millisecond)}.
interval() ->
application:get_env(rabbit, min_wal_roll_over_interval, 20000).
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