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DalmatinerDB query engine

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dqe src dqe_percentile_aggr.erl
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src/dqe_percentile_aggr.erl 

-module(dqe_percentile_aggr).

-behaviour(dqe_fun).



-include_lib("mmath/include/mmath.hrl").



-export([spec/0, describe/1, init/1, chunk/1, resolution/2, run/2,

         help/0]).



-record(state, {

          time :: pos_integer(),

          value :: float(),

          count :: pos_integer()

         }).



init([Value, Time]) when is_integer(Value) ->

    init([Value * 0.5, Time]);

init([Value, Time]) when is_integer(Time) ->

    #state{value = Value, time = Time}.



chunk(#state{time = Time}) ->

    Time * ?RDATA_SIZE.



resolution(Resolution, State = #state{time = Time}) ->

    Res = dqe_time:apply_times(Time, Resolution),

    {Res, State#state{count = Res}}.



describe(#state{time = Time}) ->

    ["percentile(", integer_to_list(Time), "ms)"].



spec() ->

    {<<"percentile">>, [metric, float, time], none, metric}.



run([Data], S = #state{value = V, count = Count}) ->

    {mmath_aggr:percentile(Data, V, Count), S}.



help() ->

    <<"Calculates a percentile over a given period of time.">>.