46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_NUMERICS_HISTOGRAM_PERCENTILE_COUNTER_H_
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#define RTC_BASE_NUMERICS_HISTOGRAM_PERCENTILE_COUNTER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <map>
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#include <vector>
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#include "absl/types/optional.h"
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namespace rtc {
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// Calculates percentiles on the stream of data. Use |Add| methods to add new
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// values. Use |GetPercentile| to get percentile of the currently added values.
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class HistogramPercentileCounter {
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public:
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// Values below |long_tail_boundary| are stored as the histogram in an array.
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// Values above - in a map.
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explicit HistogramPercentileCounter(uint32_t long_tail_boundary);
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~HistogramPercentileCounter();
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void Add(uint32_t value);
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void Add(uint32_t value, size_t count);
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void Add(const HistogramPercentileCounter& other);
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// Argument should be from 0 to 1.
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absl::optional<uint32_t> GetPercentile(float fraction);
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private:
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std::vector<size_t> histogram_low_;
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std::map<uint32_t, size_t> histogram_high_;
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const uint32_t long_tail_boundary_;
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size_t total_elements_;
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size_t total_elements_low_;
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};
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} // namespace rtc
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#endif // RTC_BASE_NUMERICS_HISTOGRAM_PERCENTILE_COUNTER_H_
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