2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <folly/stats/MultiLevelTimeSeries.h>
20 #include <glog/logging.h>
24 template <typename VT, typename TT>
25 MultiLevelTimeSeries<VT, TT>::MultiLevelTimeSeries(
28 const TimeType levelDurations[])
33 CHECK(levelDurations);
35 levels_.reserve(nLevels);
36 for (size_t i = 0; i < nLevels; ++i) {
37 if (levelDurations[i] == TT(0)) {
38 CHECK_EQ(i, nLevels - 1);
40 CHECK(levelDurations[i-1] < levelDurations[i]);
42 levels_.emplace_back(nBuckets, levelDurations[i]);
46 template <typename VT, typename TT>
47 MultiLevelTimeSeries<VT, TT>::MultiLevelTimeSeries(
49 std::initializer_list<TimeType> durations)
50 : cachedTime_(0), cachedSum_(0), cachedCount_(0) {
51 CHECK_GT(durations.size(), 0);
53 levels_.reserve(durations.size());
56 for (auto dur : durations) {
58 CHECK_EQ(i, durations.size() - 1);
62 levels_.emplace_back(nBuckets, dur);
68 template <typename VT, typename TT>
69 void MultiLevelTimeSeries<VT, TT>::addValue(
71 const ValueType& val) {
72 addValueAggregated(now, val, 1);
75 template <typename VT, typename TT>
76 void MultiLevelTimeSeries<VT, TT>::addValue(TimeType now,
79 addValueAggregated(now, val * times, times);
82 template <typename VT, typename TT>
83 void MultiLevelTimeSeries<VT, TT>::addValueAggregated(TimeType now,
84 const ValueType& total,
86 if (cachedTime_ != now) {
91 cachedCount_ += nsamples;
94 template <typename VT, typename TT>
95 void MultiLevelTimeSeries<VT, TT>::update(TimeType now) {
97 for (size_t i = 0; i < levels_.size(); ++i) {
98 levels_[i].update(now);
102 template <typename VT, typename TT>
103 void MultiLevelTimeSeries<VT, TT>::flush() {
104 // update all the underlying levels
105 if (cachedCount_ > 0) {
106 for (size_t i = 0; i < levels_.size(); ++i) {
107 levels_[i].addValueAggregated(cachedTime_, cachedSum_, cachedCount_);
114 template <typename VT, typename TT>
115 void MultiLevelTimeSeries<VT, TT>::clear() {
116 for (auto & level : levels_) {
120 cachedTime_ = TimeType(0);