net_instaweb::SplitHistogram Class Reference

#include "split_statistics.h"

Inheritance diagram for net_instaweb::SplitHistogram:

Public Member Functions
	SplitHistogram (ThreadSystem *thread_system, Histogram *rw, Histogram *w)
virtual void	Add (double value)
virtual void	Clear ()
	Throw away all data.
virtual void	Render (int index, Writer *writer, MessageHandler *handler)
virtual int	NumBuckets ()
	Returns number of buckets the histogram actually has.
virtual void	EnableNegativeBuckets ()
	Allow histogram have negative values.
virtual void	SetMinValue (double value)
	Set the minimum value allowed in histogram.
virtual void	SetMaxValue (double value)
virtual void	SetSuggestedNumBuckets (int i)
virtual double	BucketStart (int index)
virtual double	BucketLimit (int index)
	Upper bound of a bucket.
virtual double	BucketCount (int index)
	Value of a bucket.
Public Member Functions inherited from net_instaweb::Histogram
bool	Empty ()
	True if the histogram is empty.
double	Average ()
	Returns average of the values added.
double	Percentile (const double perc)
double	StandardDeviation ()
double	Count ()
double	Maximum ()
double	Minimum ()
double	Median ()
GoogleString	HtmlTableRow (const GoogleString &title, int index)

Protected Member Functions
virtual double	AverageInternal ()
	Note that these *Internal interfaces require the mutex to be held.
virtual double	PercentileInternal (const double perc)
virtual double	StandardDeviationInternal ()
virtual double	CountInternal ()
virtual double	MaximumInternal ()
virtual double	MinimumInternal ()
virtual AbstractMutex *	lock ()
Protected Member Functions inherited from net_instaweb::Histogram
void	WriteRawHistogramData (Writer *writer, MessageHandler *handler)

Detailed Description

A histogram that forwards writes to two other Histogram objects, but reads only from one.

Constructor & Destructor Documentation

net_instaweb::SplitHistogram::SplitHistogram	(	ThreadSystem *	thread_system,
		Histogram *	rw,
		Histogram *	w
	)

Histogram 'rw' will be used to read and write, histogram 'w' will be used for writes only. Does not take ownership of either 'rw' or 'w'. 'rw' and 'w' must be non-NULL.

Member Function Documentation

virtual void net_instaweb::SplitHistogram::Add ( double  value )

virtual

Reimplementation of the histogram API. See the base class for method descriptions.

Implements net_instaweb::Histogram.

virtual double net_instaweb::SplitHistogram::BucketStart ( int  index )

virtual

Lower bound of a bucket. If index == NumBuckets() + 1, returns the upper bound of the histogram. DCHECK if index is in the range of [0, NumBuckets()+1].

Implements net_instaweb::Histogram.

virtual void net_instaweb::SplitHistogram::Render ( int  index, Writer *  writer, MessageHandler *  handler  )

virtual

Write Histogram Data to the writer. Default implementation does not include histogram graph, but only raw histogram data table. It looks like:

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| TITLE String | | Avg: StdDev: Median: 90%: 95%: 99% | | Raw Histogram Data: | | [0,1] 1 25% 25% ||||| | | [2,3] 1 25% 50% ||||| | | [4,5] 2 50% 100% |||||||||| | |_______________________________________|

Reimplemented from net_instaweb::Histogram.

virtual void net_instaweb::SplitHistogram::SetMaxValue ( double  value )

virtual

Set the value upper-bound of a histogram, the value range in histogram is [MinValue, MaxValue) or [-MaxValue, MaxValue) if enabled negative buckets.

Implements net_instaweb::Histogram.

virtual void net_instaweb::SplitHistogram::SetSuggestedNumBuckets ( int  i )

virtual

Set the suggested number of buckets for the histogram. The implementation may chose to use a somewhat different number.

Implements net_instaweb::Histogram.

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The documentation for this class was generated from the following file:

• pagespeed/kernel/base/split_statistics.h