sources/includes/prometheus/detail/time_window_quantiles.h

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#pragma once
 
#include <chrono>
#include <cstddef>
#include <vector>
 
#include "prometheus/detail/ckms_quantiles.h"  // IWYU pragma: export
#include "prometheus/detail/core_export.h"
 
// IWYU pragma: private, include "prometheus/summary.h"
 
namespace prometheus {
namespace detail {
 
class PROMETHEUS_CPP_CORE_EXPORT TimeWindowQuantiles {
  using Clock = std::chrono::steady_clock;
 
 public:
  TimeWindowQuantiles(const std::vector<CKMSQuantiles::Quantile>& quantiles,
                      Clock::duration max_age_seconds, int age_buckets);
 
  double get(double q) const;
  void insert(double value);
 
 private:
  CKMSQuantiles& rotate() const;
 
  const std::vector<CKMSQuantiles::Quantile>& quantiles_;
  mutable std::vector<CKMSQuantiles> ckms_quantiles_;
  mutable std::size_t current_bucket_;
 
  mutable Clock::time_point last_rotation_;
  const Clock::duration rotation_interval_;
};
 
}  // namespace detail
}  // namespace prometheus