net_instaweb::Waveform Class Reference

#include "waveform.h"

Public Member Functions
	Waveform (ThreadSystem *thread_system, Timer *timer, int capacity, UpDownCounter *metric)
void	Clear ()
double	Average ()
double	Maximum ()
double	Minimum ()
int	Size ()
void	Add (double value)
	Records a value at the current time using the Timer.
void	AddDelta (double delta)
void	Render (const StringPiece &title, const StringPiece &label, Writer *writer, MessageHandler *handler)
	Renders a waveform into HTML.

Static Public Member Functions
static void	RenderHeader (Writer *writer, MessageHandler *handler)

Detailed Description

Displays a waveform of values over time. This can run continuously, in which case it will only display waveforms for a bounded number of samples. Or it can be run as a trigger.

However the average, min, and max values will account for all the values seen by the waveform since it was cleared.

This class is threadsafe.

Member Function Documentation

void net_instaweb::Waveform::AddDelta

(

double

delta

)

Records a delta relative to the previous value using the Timer. This is equivalent to calling Add(previous_value + delta).

static void net_instaweb::Waveform::RenderHeader ( Writer *  writer, MessageHandler *  handler  )

static

Write script and function to web page. Note that this function should be called only once for each HTML page, and should not be used for each waveform.

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

• pagespeed/kernel/base/waveform.h