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67 Zeilen
1.8 KiB
67 Zeilen
1.8 KiB
%% @doc A simple gen_event backend used to monitor mailbox size and
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%% switch log messages between synchronous and asynchronous modes.
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%% A gen_event handler is used because a process getting its own mailbox
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%% size doesn't involve getting a lock, and gen_event handlers run in their
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%% parent's process.
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-module(rumBackendThrottle).
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-behaviour(gen_event).
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-include("eRum.hrl").
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-export([
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init/1
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, handle_call/2
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, handle_event/2
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, handle_info/2
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, terminate/2,
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code_change/3
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]).
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-record(state, {
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sink :: atom(),
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hwm :: non_neg_integer(),
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window_min :: non_neg_integer(),
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async = true :: boolean()
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}).
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init([{sink, Sink}, Hwm, Window]) ->
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rumConfig:set({Sink, async}, true),
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{ok, #state{sink = Sink, hwm = Hwm, window_min = Hwm - Window}}.
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handle_call(get_loglevel, State) ->
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{ok, {mask, ?LOG_NONE}, State};
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handle_call({set_loglevel, _Level}, State) ->
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{ok, ok, State};
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handle_call(_Request, State) ->
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{ok, ok, State}.
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handle_event({mWriteLog, _Message}, State) ->
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{message_queue_len, Len} = erlang:process_info(self(), message_queue_len),
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case {Len > State#state.hwm, Len < State#state.window_min, State#state.async} of
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{true, _, true} ->
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%% need to flip to sync mode
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rumConfig:set({State#state.sink, async}, false),
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{ok, State#state{async = false}};
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{_, true, false} ->
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%% need to flip to async mode
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rumConfig:set({State#state.sink, async}, true),
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{ok, State#state{async = true}};
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_ ->
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%% nothing needs to change
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{ok, State}
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end;
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handle_event(_Event, State) ->
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{ok, State}.
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handle_info(_Info, State) ->
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{ok, State}.
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%% @private
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terminate(_Reason, _State) ->
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ok.
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%% @private
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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