histogram.h

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#pragma once
 
 
#include <promeki/config.h>
#if PROMEKI_ENABLE_CORE
#include <cstdint>
#include <promeki/namespace.h>
#include <promeki/string.h>
#include <promeki/duration.h>
 
PROMEKI_NAMESPACE_BEGIN
 
class Histogram {
        public:
                static constexpr size_t OctaveCount = 64;
                static constexpr size_t SubBucketsPerOctave = 16;
                static constexpr size_t BucketCount = OctaveCount * SubBucketsPerOctave;
 
                Histogram();
 
                void setName(const String &name);
 
                const String &name() const { return _name; }
 
                void setUnit(const String &unit);
 
                const String &unit() const { return _unit; }
 
                void reset();
 
                void addSample(int64_t value);
 
                void addSample(const Duration &d) { addSample(d.nanoseconds()); }
 
                int64_t count() const { return _count; }
 
                int64_t min() const { return _count > 0 ? _min : 0; }
 
                int64_t max() const { return _count > 0 ? _max : 0; }
 
                double mean() const;
 
                int64_t percentile(double p) const;
 
                String toString() const;
 
        private:
                String  _name;
                String  _unit;
                int64_t _count = 0;
                int64_t _sum = 0;
                int64_t _min = 0;
                int64_t _max = 0;
                int64_t _buckets[BucketCount] = {};
};
 
PROMEKI_NAMESPACE_END
 
PROMEKI_FORMAT_VIA_TOSTRING(promeki::Histogram);
 
#endif // PROMEKI_ENABLE_CORE