| 1 | -module(beam_stats_producer). |
| 2 | |
| 3 | -behaviour(gen_server). |
| 4 | |
| 5 | %% API |
| 6 | -export( |
| 7 | [ start_link/1 |
| 8 | , subscribe/1 |
| 9 | , unsubscribe/1 |
| 10 | |
| 11 | % For testing |
| 12 | , sync_produce_consume/0 |
| 13 | ]). |
| 14 | |
| 15 | %% gen_server callbacks |
| 16 | -export( |
| 17 | [ init/1 |
| 18 | , handle_call/3 |
| 19 | , handle_cast/2 |
| 20 | , handle_info/2 |
| 21 | , terminate/2 |
| 22 | , code_change/3 |
| 23 | ]). |
| 24 | |
| 25 | %% ============================================================================ |
| 26 | %% Internal data |
| 27 | %% ============================================================================ |
| 28 | |
| 29 | -define(PRODUCE_SYNC , produce_sync). |
| 30 | -define(PRODUCE_ASYNC , produce_async). |
| 31 | |
| 32 | -record(state, |
| 33 | { consumers = ordsets:new() :: ordsets:ordset(pid()) |
| 34 | , deltas_server :: beam_stats_delta:t() |
| 35 | }). |
| 36 | |
| 37 | -type state() :: |
| 38 | #state{}. |
| 39 | |
| 40 | %% ============================================================================ |
| 41 | %% API |
| 42 | %% ============================================================================ |
| 43 | |
| 44 | start_link(DeltasServer) -> |
| 45 | gen_server:start_link({local, ?MODULE}, ?MODULE, DeltasServer, []). |
| 46 | |
| 47 | -spec subscribe(pid()) -> |
| 48 | ok. |
| 49 | subscribe(PID) -> |
| 50 | gen_server:cast(?MODULE, {subscribe, PID}). |
| 51 | |
| 52 | -spec unsubscribe(pid()) -> |
| 53 | ok. |
| 54 | unsubscribe(PID) -> |
| 55 | gen_server:cast(?MODULE, {unsubscribe, PID}). |
| 56 | |
| 57 | -spec sync_produce_consume() -> |
| 58 | {}. |
| 59 | sync_produce_consume() -> |
| 60 | {} = gen_server:call(?MODULE, ?PRODUCE_SYNC). |
| 61 | |
| 62 | %% ============================================================================ |
| 63 | %% gen_server callbacks (unused) |
| 64 | %% ============================================================================ |
| 65 | |
| 66 | code_change(_OldVsn, State, _Extra) -> |
| 67 | {ok, State}. |
| 68 | |
| 69 | terminate(_Reason, _State) -> |
| 70 | ok. |
| 71 | |
| 72 | %% ============================================================================ |
| 73 | %% gen_server callbacks |
| 74 | %% ============================================================================ |
| 75 | |
| 76 | init(DeltasServer) -> |
| 77 | ok = schedule_first_production(), |
| 78 | Consumers = ordsets:new(), |
| 79 | {ok, #state{consumers=Consumers, deltas_server=DeltasServer}}. |
| 80 | |
| 81 | handle_cast({subscribe, PID}, #state{consumers=Consumers1}=State) -> |
| 82 | Consumers2 = ordsets:add_element(PID, Consumers1), |
| 83 | {noreply, State#state{consumers=Consumers2}}; |
| 84 | |
| 85 | handle_cast({unsubscribe, PID}, #state{consumers=Consumers1}=State) -> |
| 86 | Consumers2 = ordsets:del_element(PID, Consumers1), |
| 87 | {noreply, State#state{consumers=Consumers2}}. |
| 88 | |
| 89 | handle_call(?PRODUCE_SYNC, _From, State1) -> |
| 90 | State2 = produce_sync(State1), |
| 91 | {reply, {}, State2}. |
| 92 | |
| 93 | handle_info(?PRODUCE_ASYNC, #state{}=State1) -> |
| 94 | State2 = produce_async(State1), |
| 95 | ok = schedule_next_production(), |
| 96 | {noreply, State2}. |
| 97 | |
| 98 | %% ============================================================================ |
| 99 | %% Private |
| 100 | %% ============================================================================ |
| 101 | |
| 102 | -spec produce_sync(state()) -> |
| 103 | state(). |
| 104 | produce_sync(#state{}=State) -> |
| 105 | produce(State, fun beam_stats_consumer:consume_sync/2). |
| 106 | |
| 107 | -spec produce_async(state()) -> |
| 108 | state(). |
| 109 | produce_async(#state{}=State) -> |
| 110 | produce(State, fun beam_stats_consumer:consume_async/2). |
| 111 | |
| 112 | -spec produce(state(), fun((pid(), term()) -> ok)) -> |
| 113 | state(). |
| 114 | produce( |
| 115 | #state |
| 116 | { consumers = ConsumersSet |
| 117 | , deltas_server = DeltasServer |
| 118 | }=State, |
| 119 | MsgSendFun |
| 120 | ) -> |
| 121 | Stats = beam_stats:collect(DeltasServer), |
| 122 | ConsumersList = ordsets:to_list(ConsumersSet), |
| 123 | Send = fun (Consumer) -> MsgSendFun(Consumer, Stats) end, |
| 124 | ok = lists:foreach(Send, ConsumersList), |
| 125 | beam_stats_delta:gc(DeltasServer), |
| 126 | State. |
| 127 | |
| 128 | -spec schedule_first_production() -> |
| 129 | ok. |
| 130 | schedule_first_production() -> |
| 131 | _ = self() ! ?PRODUCE_ASYNC, |
| 132 | ok. |
| 133 | |
| 134 | -spec schedule_next_production() -> |
| 135 | ok. |
| 136 | schedule_next_production() -> |
| 137 | ProductionInterval = beam_stats_config:production_interval(), |
| 138 | _ = erlang:send_after(ProductionInterval, self(), ?PRODUCE_ASYNC), |
| 139 | ok. |