com.espertech.esper.metrics.codahale_metrics.metrics.core
Class Histogram

java.lang.Object
  com.espertech.esper.metrics.codahale_metrics.metrics.core.Histogram

All Implemented Interfaces:

Metric, Sampling, Summarizable

public class Histogram
extends java.lang.Object
implements Metric, Sampling, Summarizable

A metric which calculates the distribution of a value.

See Also:

Accurately computing running variance

Method Summary

void	clear() Clears all recorded values.
long	count() Returns the number of values recorded.
Snapshot	getSnapshot() Returns a snapshot of the values.
double	max() Returns the largest recorded value.
double	mean() Returns the arithmetic mean of all recorded values.
double	min() Returns the smallest recorded value.
<T> void	processWith(MetricProcessor<T> processor, MetricName name, T context) Allow the given MetricProcessor to process this as a metric.
double	stdDev() Returns the standard deviation of all recorded values.
double	sum() Returns the sum of all recorded values.
void	update(int value) Adds a recorded value.
void	update(long value) Adds a recorded value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

clear

public void clear()

Clears all recorded values.

update

public void update(int value)

Adds a recorded value.

Parameters:

value - the length of the value

update

public void update(long value)

Adds a recorded value.

Parameters:

value - the length of the value

count

public long count()

Returns the number of values recorded.

Returns:

the number of values recorded

max

public double max()

Description copied from interface: Summarizable

Returns the largest recorded value.

Specified by:

max in interface Summarizable

Returns:

the largest recorded value

min

public double min()

Description copied from interface: Summarizable

Returns the smallest recorded value.

Specified by:

min in interface Summarizable

Returns:

the smallest recorded value

mean

public double mean()

Description copied from interface: Summarizable

Returns the arithmetic mean of all recorded values.

Specified by:

mean in interface Summarizable

Returns:

the arithmetic mean of all recorded values

stdDev

public double stdDev()

Description copied from interface: Summarizable

Returns the standard deviation of all recorded values.

Specified by:

stdDev in interface Summarizable

Returns:

the standard deviation of all recorded values

sum

public double sum()

Description copied from interface: Summarizable

Returns the sum of all recorded values.

Specified by:

sum in interface Summarizable

Returns:

the sum of all recorded values

getSnapshot

public Snapshot getSnapshot()

Description copied from interface: Sampling

Returns a snapshot of the values.

Specified by:

getSnapshot in interface Sampling

Returns:

a snapshot of the values

processWith

public <T> void processWith(MetricProcessor<T> processor,
                            MetricName name,
                            T context)
                 throws java.lang.Exception

Description copied from interface: Metric

Allow the given MetricProcessor to process this as a metric.

Specified by:

processWith in interface Metric

Type Parameters:

T - the type of the context object

Parameters:

processor - a MetricProcessor

name - the name of the current metric

context - a given context which should be passed on to processor

Throws:

java.lang.Exception - if something goes wrong