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mmath

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math library for metric sequences and binary arrays.

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mmath src mmath_aggr.erl
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src/mmath_aggr.erl 

%%%-------------------------------------------------------------------

%%% @author Heinz Nikolaus Gies <heinz@licenser.net>

%%% @copyright (C) 2014, Heinz Nikolaus Gies

%%% @doc

%%% Functions that aggregate metrics by grouping together chunks of values

%%% @end

%%% Created :  8 Jun 2014 by Heinz Nikolaus Gies <heinz@licenser.net>

%%%-------------------------------------------------------------------

-module(mmath_aggr).



-export([load_nif/0]).

-export([sum/2,

         avg/2,

         min/2,

         max/2]).



-include("mmath.hrl").



-define(APPNAME, mmath).

-define(LIBNAME, aggr_nif).

-on_load(load_nif/0).

load_nif() ->

    SoName = case code:priv_dir(?APPNAME) of

                 {error, bad_name} ->

                     case filelib:is_dir(filename:join(["..", priv])) of

                         true ->

                             filename:join(["..", priv, ?LIBNAME]);

                         _ ->

                             filename:join([priv, ?LIBNAME])

                     end;

                 Dir ->

                     filename:join(Dir, ?LIBNAME)

             end,

    erlang:load_nif(SoName, 0).



%%--------------------------------------------------------------------

%% @doc

%% Aggregates a binary by combining the chunks into the average (mean)

%% of their values.

%% @end

%%--------------------------------------------------------------------

-spec avg(binary(), pos_integer()) -> binary().

avg(_Data, _Count) when _Count > 0 ->

    erlang:nif_error(nif_library_not_loaded).



%%--------------------------------------------------------------------

%% @doc

%% Aggregates a binary by combining the chunks into the sum of their

%% values.

%% @end

%%--------------------------------------------------------------------

-spec sum(binary(), pos_integer()) -> binary().

sum(_Data, _Count) when _Count > 0 ->

    erlang:nif_error(nif_library_not_loaded).



%%--------------------------------------------------------------------

%% @doc

%% Aggregates a binary by combining the chunks into the minimum value

%% in the chunk.

%% @end

%%--------------------------------------------------------------------

-spec min(binary(), pos_integer()) -> binary().

min(_Data, _Count) when _Count > 0 ->

    erlang:nif_error(nif_library_not_loaded).



%%--------------------------------------------------------------------

%% @doc

%% Aggregates a binary by combining the chunks into the maximum value

%% in the chunk.

%% @end

%%--------------------------------------------------------------------

-spec max(binary(), pos_integer()) -> binary().

max(_Data, _Count) when _Count > 0  ->

    erlang:nif_error(nif_library_not_loaded).