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#ifndef SRC_HISTOGRAM_H_ |
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#define SRC_HISTOGRAM_H_ |
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS |
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#include "hdr_histogram.h" |
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#include "base_object.h" |
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#include "util.h" |
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#include <functional> |
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#include <limits> |
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#include <map> |
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namespace node { |
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constexpr int kDefaultHistogramFigures = 3; |
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class Histogram { |
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public: |
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Histogram( |
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int64_t lowest = std::numeric_limits<int64_t>::min(), |
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int64_t highest = std::numeric_limits<int64_t>::max(), |
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int figures = kDefaultHistogramFigures); |
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virtual ~Histogram() = default; |
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inline bool Record(int64_t value); |
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inline void Reset(); |
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inline int64_t Min(); |
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inline int64_t Max(); |
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inline double Mean(); |
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inline double Stddev(); |
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inline double Percentile(double percentile); |
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// Iterator is a function type that takes two doubles as argument, one for |
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// percentile and one for the value at that percentile. |
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template <typename Iterator> |
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inline void Percentiles(Iterator&& fn); |
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size_t GetMemorySize() const { |
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return hdr_get_memory_size(histogram_.get()); |
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} |
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private: |
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using HistogramPointer = DeleteFnPtr<hdr_histogram, hdr_close>; |
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HistogramPointer histogram_; |
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}; |
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class HistogramBase : public BaseObject, public Histogram { |
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public: |
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virtual ~HistogramBase() = default; |
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virtual void TraceDelta(int64_t delta) {} |
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virtual void TraceExceeds(int64_t delta) {} |
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inline bool RecordDelta(); |
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inline void ResetState(); |
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int64_t Exceeds() const { return exceeds_; } |
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void MemoryInfo(MemoryTracker* tracker) const override; |
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SET_MEMORY_INFO_NAME(HistogramBase) |
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SET_SELF_SIZE(HistogramBase) |
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static void GetMin(const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void GetMax(const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void GetMean(const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void GetExceeds(const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void GetStddev(const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void GetPercentile( |
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const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void GetPercentiles( |
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const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void DoReset(const v8::FunctionCallbackInfo<v8::Value>& args); |
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static void Initialize(Environment* env); |
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static BaseObjectPtr<HistogramBase> New( |
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Environment* env, |
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int64_t lowest = std::numeric_limits<int64_t>::min(), |
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int64_t highest = std::numeric_limits<int64_t>::max(), |
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int figures = kDefaultHistogramFigures); |
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HistogramBase( |
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Environment* env, |
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v8::Local<v8::Object> wrap, |
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int64_t lowest = std::numeric_limits<int64_t>::min(), |
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int64_t highest = std::numeric_limits<int64_t>::max(), |
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int figures = kDefaultHistogramFigures); |
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private: |
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int64_t exceeds_ = 0; |
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uint64_t prev_ = 0; |
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}; |
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} // namespace node |
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#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS |
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#endif // SRC_HISTOGRAM_H_ |