Viewing file:  histogram.h (2.83 KB) -rw-r--r--
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#ifndef SRC_HISTOGRAM_H_
#define SRC_HISTOGRAM_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#include "hdr_histogram.h"
#include "base_object.h"
#include "util.h"
#include <functional>
#include <limits>
#include <map>
namespace node {
constexpr int kDefaultHistogramFigures = 3;
class Histogram {
public:
Histogram(
int64_t lowest = std::numeric_limits<int64_t>::min(),
int64_t highest = std::numeric_limits<int64_t>::max(),
int figures = kDefaultHistogramFigures);
virtual ~Histogram() = default;
inline bool Record(int64_t value);
inline void Reset();
inline int64_t Min();
inline int64_t Max();
inline double Mean();
inline double Stddev();
inline double Percentile(double percentile);
// 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);
size_t GetMemorySize() const {
return hdr_get_memory_size(histogram_.get());
}
private:
using HistogramPointer = DeleteFnPtr<hdr_histogram, hdr_close>;
HistogramPointer histogram_;
};
class HistogramBase : public BaseObject, public Histogram {
public:
virtual ~HistogramBase() = default;
virtual void TraceDelta(int64_t delta) {}
virtual void TraceExceeds(int64_t delta) {}
inline bool RecordDelta();
inline void ResetState();
int64_t Exceeds() const { return exceeds_; }
void MemoryInfo(MemoryTracker* tracker) const override;
SET_MEMORY_INFO_NAME(HistogramBase)
SET_SELF_SIZE(HistogramBase)
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 GetPercentiles(
const v8::FunctionCallbackInfo<v8::Value>& args);
static void DoReset(const v8::FunctionCallbackInfo<v8::Value>& args);
static void Initialize(Environment* env);
static BaseObjectPtr<HistogramBase> New(
Environment* env,
int64_t lowest = std::numeric_limits<int64_t>::min(),
int64_t highest = std::numeric_limits<int64_t>::max(),
int figures = kDefaultHistogramFigures);
HistogramBase(
Environment* env,
v8::Local<v8::Object> wrap,
int64_t lowest = std::numeric_limits<int64_t>::min(),
int64_t highest = std::numeric_limits<int64_t>::max(),
int figures = kDefaultHistogramFigures);
private:
int64_t exceeds_ = 0;
uint64_t prev_ = 0;
};
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_HISTOGRAM_H_
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