node/src/histogram.h at main · fetchapi/node · GitHub

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#ifndef SRC_HISTOGRAM_H_

#define SRC_HISTOGRAM_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include <hdr/hdr_histogram.h>

#include "base_object.h"

#include "memory_tracker.h"

#include "node_messaging.h"

#include "util.h"

#include "uv.h"

#include "v8.h"

#include <functional>

#include <limits>

#include <map>

#include <string>

namespace node {

class ExternalReferenceRegistry;

constexpr int kDefaultHistogramFigures = 3;

class Histogram : public MemoryRetainer {

public:

struct Options {

int64_t lowest = 1;

int64_t highest = std::numeric_limits<int64_t>::max();

int figures = kDefaultHistogramFigures;

};

explicit Histogram(const Options& options);

virtual ~Histogram() = default;

inline bool Record(int64_t value);

inline void Reset();

inline int64_t Min() const;

inline int64_t Max() const;

inline double Mean() const;

inline double Stddev() const;

inline int64_t Percentile(double percentile) const;

inline size_t Exceeds() const { return exceeds_; }

inline size_t Count() const;

inline uint64_t RecordDelta();

inline double Add(const Histogram& other);

// Iterator is a function type that takes two doubles as argument, one for

// percentile and one for the value at that percentile.

template <typename Iterator>

inline void Percentiles(Iterator&& fn);

inline size_t GetMemorySize() const;

void MemoryInfo(MemoryTracker* tracker) const override;

SET_MEMORY_INFO_NAME(Histogram)

SET_SELF_SIZE(Histogram)

private:

using HistogramPointer = DeleteFnPtr<hdr_histogram, hdr_close>;

HistogramPointer histogram_;

uint64_t prev_ = 0;

size_t exceeds_ = 0;

size_t count_ = 0;

Mutex mutex_;

};

class HistogramImpl {

public:

explicit HistogramImpl(

const Histogram::Options& options = Histogram::Options {});

explicit HistogramImpl(std::shared_ptr<Histogram> histogram);

Histogram* operator->() { return histogram_.get(); }

const std::shared_ptr<Histogram>& histogram() const { return histogram_; }

private:

std::shared_ptr<Histogram> histogram_;

};

class HistogramBase : public BaseObject, public HistogramImpl {

public:

static v8::Local<v8::FunctionTemplate> GetConstructorTemplate(

IsolateData* isolate_data);

static void Initialize(IsolateData* isolate_data,

v8::Local<v8::ObjectTemplate> target);

static void RegisterExternalReferences(ExternalReferenceRegistry* registry);

static BaseObjectPtr<HistogramBase> Create(

Environment* env,

const Histogram::Options& options = Histogram::Options {});

static BaseObjectPtr<HistogramBase> Create(

Environment* env,

std::shared_ptr<Histogram> histogram);

static void New(const v8::FunctionCallbackInfo<v8::Value>& args);

void MemoryInfo(MemoryTracker* tracker) const override;

SET_MEMORY_INFO_NAME(HistogramBase)

SET_SELF_SIZE(HistogramBase)

static void GetCountBigInt(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetMinBigInt(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetMaxBigInt(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetExceedsBigInt(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetCount(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetMin(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetMax(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetMean(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetExceeds(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetStddev(const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetPercentile(

const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetPercentileBigInt(

const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetPercentiles(

const v8::FunctionCallbackInfo<v8::Value>& args);

static void GetPercentilesBigInt(

const v8::FunctionCallbackInfo<v8::Value>& args);

static void DoReset(const v8::FunctionCallbackInfo<v8::Value>& args);

static void Record(const v8::FunctionCallbackInfo<v8::Value>& args);

static void RecordDelta(const v8::FunctionCallbackInfo<v8::Value>& args);

static void Add(const v8::FunctionCallbackInfo<v8::Value>& args);

HistogramBase(

Environment* env,

v8::Local<v8::Object> wrap,

const Histogram::Options& options = Histogram::Options {});

HistogramBase(

Environment* env,

v8::Local<v8::Object> wrap,

std::shared_ptr<Histogram> histogram);

BaseObject::TransferMode GetTransferMode() const override {

return TransferMode::kCloneable;

}

std::unique_ptr<worker::TransferData> CloneForMessaging() const override;

class HistogramTransferData : public worker::TransferData {

public:

explicit HistogramTransferData(const HistogramBase* histogram)

: histogram_(histogram->histogram()) {}

explicit HistogramTransferData(std::shared_ptr<Histogram> histogram)

: histogram_(std::move(histogram)) {}

BaseObjectPtr<BaseObject> Deserialize(

Environment* env,

v8::Local<v8::Context> context,

std::unique_ptr<worker::TransferData> self) override;

void MemoryInfo(MemoryTracker* tracker) const override;

SET_MEMORY_INFO_NAME(HistogramTransferData)

SET_SELF_SIZE(HistogramTransferData)

private:

std::shared_ptr<Histogram> histogram_;

};

class IntervalHistogram : public HandleWrap, public HistogramImpl {

public:

enum class StartFlags {

NONE,

RESET

};

static void RegisterExternalReferences(ExternalReferenceRegistry* registry);

static v8::Local<v8::FunctionTemplate> GetConstructorTemplate(

Environment* env);

static BaseObjectPtr<IntervalHistogram> Create(

Environment* env,

int32_t interval,

std::function<void(Histogram&)> on_interval,

const Histogram::Options& options);

IntervalHistogram(

Environment* env,

v8::Local<v8::Object> wrap,

AsyncWrap::ProviderType type,