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 | |
| 12 | ]). | |
| 13 | ||
| 14 | %% gen_server callbacks | |
| 15 | -export( | |
| 16 | [ init/1 | |
| 17 | , handle_call/3 | |
| 18 | , handle_cast/2 | |
| 19 | , handle_info/2 | |
| 20 | , terminate/2 | |
| 21 | , code_change/3 | |
| 22 | ]). | |
| 23 | ||
| 24 | %% ============================================================================ | |
| 25 | %% Internal data | |
| 26 | %% ============================================================================ | |
| 27 | ||
| 28 | -define(SIGNAL_PRODUCTION , beam_stats_production_signal). | |
| 29 | ||
| 30 | -record(state, | |
| 31 | { consumers = ordsets:new() :: ordsets:ordset(pid()) | |
| 32 | }). | |
| 33 | ||
| 34 | %% ============================================================================ | |
| 35 | %% API | |
| 36 | %% ============================================================================ | |
| 37 | ||
| 38 | start_link() -> | |
| 39 | gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). | |
| 40 | ||
| 41 | -spec subscribe(pid()) -> | |
| 42 | ok. | |
| 43 | subscribe(PID) -> | |
| 44 | gen_server:cast(?MODULE, {subscribe, PID}). | |
| 45 | ||
| 46 | -spec unsubscribe(pid()) -> | |
| 47 | ok. | |
| 48 | unsubscribe(PID) -> | |
| 49 | gen_server:cast(?MODULE, {unsubscribe, PID}). | |
| 50 | ||
| 51 | %% ============================================================================ | |
| 52 | %% gen_server callbacks (unused) | |
| 53 | %% ============================================================================ | |
| 54 | ||
| 55 | handle_call(_Request, _From, State) -> | |
| 56 | ?METHOD_SHOULD_NOT_BE_USED(handle_call, State). | |
| 57 | ||
| 58 | code_change(_OldVsn, State, _Extra) -> | |
| 59 | {ok, State}. | |
| 60 | ||
| 61 | terminate(_Reason, _State) -> | |
| 62 | ok. | |
| 63 | ||
| 64 | %% ============================================================================ | |
| 65 | %% gen_server callbacks | |
| 66 | %% ============================================================================ | |
| 67 | ||
| 68 | init([]) -> | |
| 69 | ok = schedule_first_production(), | |
| 70 | Consumers = ordsets:new(), | |
| 71 | {ok, #state{consumers=Consumers}}. | |
| 72 | ||
| 73 | handle_cast({subscribe, PID}, #state{consumers=Consumers1}=State) -> | |
| 74 | Consumers2 = ordsets:add_element(PID, Consumers1), | |
| 75 | {noreply, State#state{consumers=Consumers2}}; | |
| 76 | ||
| 77 | handle_cast({unsubscribe, PID}, #state{consumers=Consumers1}=State) -> | |
| 78 | Consumers2 = ordsets:del_element(PID, Consumers1), | |
| 79 | {noreply, State#state{consumers=Consumers2}}. | |
| 80 | ||
| 81 | handle_info(?SIGNAL_PRODUCTION, #state{consumers=ConsumersSet}=State) -> | |
| 82 | ConsumersList = ordsets:to_list(ConsumersSet), | |
| 83 | ok = collect_and_push_to_consumers(ConsumersList), | |
| 84 | ok = schedule_next_production(), | |
| 85 | {noreply, State}. | |
| 86 | ||
| 87 | %% ============================================================================ | |
| 88 | %% Private | |
| 89 | %% ============================================================================ | |
| 90 | ||
| 91 | -spec schedule_first_production() -> | |
| 92 | ok. | |
| 93 | schedule_first_production() -> | |
| 94 | _ = self() ! ?SIGNAL_PRODUCTION, | |
| 95 | ok. | |
| 96 | ||
| 97 | -spec schedule_next_production() -> | |
| 98 | ok. | |
| 99 | schedule_next_production() -> | |
| 100 | ProductionInterval = beam_stats_config:production_interval(), | |
| 101 | _ = erlang:send_after(ProductionInterval, self(), ?SIGNAL_PRODUCTION), | |
| 102 | ok. | |
| 103 | ||
| 104 | -spec collect_and_push_to_consumers([pid()]) -> | |
| 105 | ok. | |
| 106 | collect_and_push_to_consumers(Consumers) -> | |
| 107 | BEAMStats = beam_stats:collect(), | |
| 108 | Push = fun (Consumer) -> gen_server:cast(Consumer, BEAMStats) end, | |
| 109 | lists:foreach(Push, Consumers). |