| %%% |
| %%% 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 = folsom_utils:get_ets_size(Reservoir) + 1}; |
| update(#none{reservoir = Reservoir, n = N} = Sample, Value) -> |
| Oldest = ets:first(Reservoir), |
| ets:delete(Reservoir, Oldest), |
| ets:insert(Reservoir, {N, Value}), |
| Sample#none{n = folsom_utils:get_ets_size(Reservoir) + 1}. |
| |
| get_values(#none{reservoir = Reservoir}) -> |
| {_, Values} = lists:unzip(ets:tab2list(Reservoir)), |
| Values. |