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%%%
%%% Copyright 2011, Boundary
%%%
%%% Licensed under the Apache License, Version 2.0 (the "License");
%%% you may not use this file except in compliance with the License.
%%% You may obtain a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%%
%%%-------------------------------------------------------------------
%%% File: folsom_sample_none.erl
%%% @author joe williams <j@boundary.com>
%%% @doc
%%% no sampling, just a capped circular buffer
%%% @end
%%%-----------------------------------------------------------------
-module(folsom_sample_none).
-export([
new/1,
update/2,
get_values/1
]).
-include("folsom.hrl").
new(Size) ->
#none{size = Size}.
update(#none{size = Size, reservoir = Reservoir, n = N} = Sample, Value)
when N =:= Size ->
ets:insert(Reservoir, {N, Value}),
Sample#none{n = 1};
update(#none{reservoir = Reservoir, n = N} = Sample, Value) ->
ets:insert(Reservoir, {N, Value}),
Sample#none{n = N + 1}.
get_values(#none{reservoir = Reservoir}) ->
{_, Values} = lists:unzip(ets:tab2list(Reservoir)),
Values.