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| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you 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. | ||
|
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| #pragma once | ||
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| #include <algorithm> | ||
| #include <boost/circular_buffer.hpp> | ||
| #include <mutex> | ||
| #include <numeric> | ||
| #include <shared_mutex> | ||
| #include <vector> | ||
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| namespace doris { | ||
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| template <typename T> | ||
| class IntervalHistogramStat { | ||
| public: | ||
| IntervalHistogramStat(size_t N) : window(N) {} | ||
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| void add(T value) { | ||
| std::unique_lock<std::shared_mutex> lock(mutex); | ||
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| if (window.full()) { | ||
| window.pop_front(); | ||
| } | ||
| window.push_back(value); | ||
| } | ||
|
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| T mean() { | ||
| std::shared_lock<std::shared_mutex> lock(mutex); | ||
| if (window.empty()) { | ||
| return T(); | ||
| } | ||
|
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| T sum = std::accumulate(window.begin(), window.end(), T()); | ||
| return sum / window.size(); | ||
| } | ||
|
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| T median() { | ||
| std::shared_lock<std::shared_mutex> lock(mutex); | ||
| if (window.empty()) { | ||
| return T(); | ||
| } | ||
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| std::vector<T> sorted(window.begin(), window.end()); | ||
| std::sort(sorted.begin(), sorted.end()); | ||
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| size_t mid = sorted.size() / 2; | ||
| return sorted.size() % 2 == 0 ? (sorted[mid - 1] + sorted[mid]) / 2 : sorted[mid]; | ||
| } | ||
|
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| T max() { | ||
| std::shared_lock<std::shared_mutex> lock(mutex); | ||
| return *std::max_element(window.begin(), window.end()); | ||
| } | ||
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| T min() { | ||
| std::shared_lock<std::shared_mutex> lock(mutex); | ||
| return *std::min_element(window.begin(), window.end()); | ||
| } | ||
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| private: | ||
| boost::circular_buffer<T> window; | ||
| std::shared_mutex mutex; | ||
| }; | ||
| } // namespace doris |
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