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DalmatinerDB query engine

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dqe src dqe_last_below_aggr.erl
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src/dqe_last_below_aggr.erl 

-module(dqe_last_below_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(),

          count :: pos_integer(),

          const :: number()

         }).



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

    #state{const = Const*1.0,

           time = Time};

init([Const, Time]) when is_float(Const) ->

    #state{const = Const,

           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{const = Const, time = Time})->

    ["last_below(", float_to_list(Const), ", ", integer_to_list(Time), ",s)"].



spec() ->

    [{<<"last_below">>, [metric, integer, time], none, metric},

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



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

    {mmath_aggr:last_below(Data, Const, Count), S}.



help() ->

    <<"Returns the last value below a given threashold.">>.