-module(beam_stats_producer).
--include("beam_stats.hrl").
-
-behaviour(gen_server).
%% API
, subscribe/1
, unsubscribe/1
- % Force production and distribution. Blocks. Mainly for testing.
- , force_production/0
+ % For testing
+ , sync_produce_consume/0
]).
%% gen_server callbacks
%% Internal data
%% ============================================================================
--define(SIGNAL_PRODUCTION , beam_stats_production_signal).
--define(FORCE_PRODUCTION , beam_stats_force_production).
+-define(PRODUCE_SYNC , produce_sync).
+-define(PRODUCE_ASYNC , produce_async).
-record(state,
{ consumers = ordsets:new() :: ordsets:ordset(pid())
unsubscribe(PID) ->
gen_server:cast(?MODULE, {unsubscribe, PID}).
--spec force_production() ->
+-spec sync_produce_consume() ->
{}.
-force_production() ->
- gen_server:call(?MODULE, ?FORCE_PRODUCTION).
+sync_produce_consume() ->
+ {} = gen_server:call(?MODULE, ?PRODUCE_SYNC).
%% ============================================================================
%% gen_server callbacks (unused)
Consumers2 = ordsets:del_element(PID, Consumers1),
{noreply, State#state{consumers=Consumers2}}.
-handle_call(?FORCE_PRODUCTION, _From, State1) ->
- State2 = produce(State1),
+handle_call(?PRODUCE_SYNC, _From, State1) ->
+ State2 = produce_sync(State1),
{reply, {}, State2}.
-handle_info(?SIGNAL_PRODUCTION, #state{}=State1) ->
- State2 = produce(State1),
+handle_info(?PRODUCE_ASYNC, #state{}=State1) ->
+ State2 = produce_async(State1),
ok = schedule_next_production(),
{noreply, State2}.
%% Private
%% ============================================================================
--spec produce(state()) ->
+-spec produce_sync(state()) ->
+ state().
+produce_sync(#state{}=State) ->
+ produce(State, fun beam_stats_consumer:consume_sync/2).
+
+-spec produce_async(state()) ->
state().
-produce(#state{consumers=ConsumersSet, stats_state=StatsState1}=State) ->
+produce_async(#state{}=State) ->
+ produce(State, fun beam_stats_consumer:consume_async/2).
+
+-spec produce(state(), fun((pid(), term()) -> ok)) ->
+ state().
+produce(
+ #state
+ { consumers = ConsumersSet
+ , stats_state = StatsState1
+ }=State,
+ MsgSendFun
+) ->
StatsState2 = beam_stats_state:update(StatsState1),
Stats = beam_stats_state:export(StatsState2),
ConsumersList = ordsets:to_list(ConsumersSet),
- ok = push_to_consumers(Stats, ConsumersList),
+ Send = fun (Consumer) -> MsgSendFun(Consumer, Stats) end,
+ ok = lists:foreach(Send, ConsumersList),
State#state{stats_state = StatsState2}.
-spec schedule_first_production() ->
ok.
schedule_first_production() ->
- _ = self() ! ?SIGNAL_PRODUCTION,
+ _ = self() ! ?PRODUCE_ASYNC,
ok.
-spec schedule_next_production() ->
ok.
schedule_next_production() ->
ProductionInterval = beam_stats_config:production_interval(),
- _ = erlang:send_after(ProductionInterval, self(), ?SIGNAL_PRODUCTION),
- ok.
-
--spec push_to_consumers(beam_stats:t(), [pid()]) ->
+ _ = erlang:send_after(ProductionInterval, self(), ?PRODUCE_ASYNC),
ok.
-push_to_consumers(Stats, Consumers) ->
- Push = fun (Consumer) -> gen_server:cast(Consumer, Stats) end,
- lists:foreach(Push, Consumers).