home / code / beam_stats.git / blame
| Commit | Line | Data |
|---|---|---|
| caf75ed8 SK |
1 | -module(beam_stats_producer). |
| 2 | ||
| 3 | -include("beam_stats.hrl"). | |
| 4 | ||
| 5 | -behaviour(gen_server). | |
| 6 | ||
| 7 | %% API | |
| 8 | -export( | |
| 9 | [ start_link/0 | |
| 10 | , subscribe/1 | |
| 11 | , unsubscribe/1 | |
| 4997ac36 SK |
12 | |
| 13 | % Force production and distribution. Blocks. Mainly for testing. | |
| 14 | , force_production/0 | |
| caf75ed8 SK |
15 | ]). |
| 16 | ||
| 17 | %% gen_server callbacks | |
| 18 | -export( | |
| 19 | [ init/1 | |
| 20 | , handle_call/3 | |
| 21 | , handle_cast/2 | |
| 22 | , handle_info/2 | |
| 23 | , terminate/2 | |
| 24 | , code_change/3 | |
| 25 | ]). | |
| 26 | ||
| 27 | %% ============================================================================ | |
| 28 | %% Internal data | |
| 29 | %% ============================================================================ | |
| 30 | ||
| 31 | -define(SIGNAL_PRODUCTION , beam_stats_production_signal). | |
| 4997ac36 | 32 | -define(FORCE_PRODUCTION , beam_stats_force_production). |
| caf75ed8 SK |
33 | |
| 34 | -record(state, | |
| 35 | { consumers = ordsets:new() :: ordsets:ordset(pid()) | |
| 36 | }). | |
| 37 | ||
| 4997ac36 SK |
38 | -type state() :: |
| 39 | #state{}. | |
| 40 | ||
| caf75ed8 SK |
41 | %% ============================================================================ |
| 42 | %% API | |
| 43 | %% ============================================================================ | |
| 44 | ||
| 45 | start_link() -> | |
| 46 | gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). | |
| 47 | ||
| 48 | -spec subscribe(pid()) -> | |
| 49 | ok. | |
| 50 | subscribe(PID) -> | |
| 51 | gen_server:cast(?MODULE, {subscribe, PID}). | |
| 52 | ||
| 53 | -spec unsubscribe(pid()) -> | |
| 54 | ok. | |
| 55 | unsubscribe(PID) -> | |
| 56 | gen_server:cast(?MODULE, {unsubscribe, PID}). | |
| 57 | ||
| 4997ac36 SK |
58 | -spec force_production() -> |
| 59 | {}. | |
| 60 | force_production() -> | |
| 61 | gen_server:call(?MODULE, ?FORCE_PRODUCTION). | |
| 62 | ||
| caf75ed8 SK |
63 | %% ============================================================================ |
| 64 | %% gen_server callbacks (unused) | |
| 65 | %% ============================================================================ | |
| 66 | ||
| caf75ed8 SK |
67 | code_change(_OldVsn, State, _Extra) -> |
| 68 | {ok, State}. | |
| 69 | ||
| 70 | terminate(_Reason, _State) -> | |
| 71 | ok. | |
| 72 | ||
| 73 | %% ============================================================================ | |
| 74 | %% gen_server callbacks | |
| 75 | %% ============================================================================ | |
| 76 | ||
| 77 | init([]) -> | |
| 78 | ok = schedule_first_production(), | |
| 79 | Consumers = ordsets:new(), | |
| 80 | {ok, #state{consumers=Consumers}}. | |
| 81 | ||
| 82 | handle_cast({subscribe, PID}, #state{consumers=Consumers1}=State) -> | |
| 83 | Consumers2 = ordsets:add_element(PID, Consumers1), | |
| 84 | {noreply, State#state{consumers=Consumers2}}; | |
| 85 | ||
| 86 | handle_cast({unsubscribe, PID}, #state{consumers=Consumers1}=State) -> | |
| 87 | Consumers2 = ordsets:del_element(PID, Consumers1), | |
| 88 | {noreply, State#state{consumers=Consumers2}}. | |
| 89 | ||
| 4997ac36 SK |
90 | handle_call(?FORCE_PRODUCTION, _From, State) -> |
| 91 | {} = produce(State), | |
| 92 | {reply, {}, State}. | |
| 93 | ||
| 94 | handle_info(?SIGNAL_PRODUCTION, #state{}=State) -> | |
| 95 | {} = produce(State), | |
| caf75ed8 SK |
96 | ok = schedule_next_production(), |
| 97 | {noreply, State}. | |
| 98 | ||
| 99 | %% ============================================================================ | |
| 100 | %% Private | |
| 101 | %% ============================================================================ | |
| 102 | ||
| 4997ac36 SK |
103 | -spec produce(state()) -> |
| 104 | {}. | |
| 105 | produce(#state{consumers=ConsumersSet}) -> | |
| 106 | ConsumersList = ordsets:to_list(ConsumersSet), | |
| 107 | ok = collect_and_push_to_consumers(ConsumersList), | |
| 108 | {}. | |
| 109 | ||
| caf75ed8 SK |
110 | -spec schedule_first_production() -> |
| 111 | ok. | |
| 112 | schedule_first_production() -> | |
| 113 | _ = self() ! ?SIGNAL_PRODUCTION, | |
| 114 | ok. | |
| 115 | ||
| 116 | -spec schedule_next_production() -> | |
| 117 | ok. | |
| 118 | schedule_next_production() -> | |
| 119 | ProductionInterval = beam_stats_config:production_interval(), | |
| 120 | _ = erlang:send_after(ProductionInterval, self(), ?SIGNAL_PRODUCTION), | |
| 121 | ok. | |
| 122 | ||
| 123 | -spec collect_and_push_to_consumers([pid()]) -> | |
| 124 | ok. | |
| 125 | collect_and_push_to_consumers(Consumers) -> | |
| 126 | BEAMStats = beam_stats:collect(), | |
| 127 | Push = fun (Consumer) -> gen_server:cast(Consumer, BEAMStats) end, | |
| 128 | lists:foreach(Push, Consumers). |