Inheritance diagram for net_instaweb::Histogram:

Public Member Functions
virtual void	Add (double value)=0
	Record a value in its bucket.

virtual void	Clear ()=0
	Throw away all data.

bool	Empty ()
	True if the histogram is empty.

virtual void	Render (int index, Writer writer, MessageHandler handler)

virtual int	NumBuckets ()=0
	Returns number of buckets the histogram actually has.

virtual void	EnableNegativeBuckets ()=0
	Allow histogram have negative values.

virtual void	SetMinValue (double value)=0
	Set the minimum value allowed in histogram.

virtual void	SetMaxValue (double value)=0

virtual void	SetSuggestedNumBuckets (int i)=0

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)

virtual double	BucketStart (int index)=0

virtual double	BucketLimit (int index)
	Upper bound of a bucket.

virtual double	BucketCount (int index)=0
	Value of a bucket.

Protected Member Functions
virtual double	AverageInternal ()=0
	Note that these *Internal interfaces require the mutex to be held.

virtual double	PercentileInternal (const double perc)=0

virtual double	StandardDeviationInternal ()=0

virtual double	CountInternal ()=0

virtual double	MaximumInternal ()=0

virtual double	MinimumInternal ()=0

virtual AbstractMutex *	lock ()=0

void	WriteRawHistogramData (Writer writer, MessageHandler handler)

Member Function Documentation

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

pure 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].

Implemented in net_instaweb::CountHistogram, net_instaweb::SharedMemHistogram, and net_instaweb::SplitHistogram.

GoogleString net_instaweb::Histogram::HtmlTableRow	(	const GoogleString &	title,
		int	index
	)

Formats the histogram statistics as an HTML table row. This is intended for use in Statistics::RenderHistograms.

The

element id is given id=hist_row_d where d is from the index. Included in the row an input radio button which is initiated in state 'selected' for index==0.

double net_instaweb::Histogram::Percentile ( const double perc )

inline

Return estimated value that is greater than perc% of all data. e.g. Percentile(20) returns the value which is greater than 20% of data.

virtual void net_instaweb::Histogram::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:

| 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 in net_instaweb::SplitHistogram.

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

pure virtual

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

Implemented in net_instaweb::CountHistogram, net_instaweb::SharedMemHistogram, and net_instaweb::SplitHistogram.

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

pure virtual

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

Implemented in net_instaweb::CountHistogram, net_instaweb::SharedMemHistogram, and net_instaweb::SplitHistogram.

void net_instaweb::Histogram::WriteRawHistogramData	(	Writer *	writer,
		MessageHandler *	handler
	)

protected

Helper function of Render(), write entries of histogram raw data table. Each entry includes bucket range, bucket count, percentage, cumulative percentage, bar. It looks like: [0,1] 1 5% 5% |||| [2,3] 2 10% 15% |||||||| Precondition: mutex held.

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

pagespeed/kernel/base/statistics.h

Public Member Functions

Protected Member Functions

Member Function Documentation