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