org.apache.kafka.common.metrics.stats

Class Rate

java.lang.Object

org.apache.kafka.common.metrics.stats.Rate

All Implemented Interfaces:

Measurable, MeasurableStat, MetricValueProvider<Double>, Stat

Direct Known Subclasses:

SimpleRate

public class Rate
extends Object
implements MeasurableStat

The rate of the given quantity. By default this is the total observed over a set of samples from a sampled statistic divided by the elapsed time over the sample windows. Alternative SampledStat implementations can be provided, however, to record the rate of occurrences (e.g. the count of values measured over the time interval) or other such values.

Field Summary

Fields

Modifier and Type	Field and Description
protected SampledStat	stat
protected TimeUnit	unit

Constructor Summary

Constructors

Constructor and Description
Rate()
Rate(SampledStat stat)
Rate(TimeUnit unit)
Rate(TimeUnit unit, SampledStat stat)

Method Summary

Modifier and Type	Method and Description
double	measure(MetricConfig config, long now) Measure this quantity and return the result as a double
void	record(MetricConfig config, double value, long timeMs) Record the given value
String	toString()
String	unitName()
long	windowSize(MetricConfig config, long now)

Methods inherited from class java.lang.Object

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

Field Detail

unit

protected final TimeUnit unit

stat

protected final SampledStat stat

Constructor Detail

Rate

public Rate()

Rate

public Rate(TimeUnit unit)

Rate

public Rate(SampledStat stat)

Rate

public Rate(TimeUnit unit,
            SampledStat stat)

Method Detail

unitName

public String unitName()

record

public void record(MetricConfig config,
                   double value,
                   long timeMs)

Description copied from interface: Stat

Record the given value

Specified by:

record in interface Stat

Parameters:

config - The configuration to use for this metric

value - The value to record

timeMs - The POSIX time in milliseconds this value occurred

measure

public double measure(MetricConfig config,
                      long now)

Description copied from interface: Measurable

Measure this quantity and return the result as a double

Specified by:

measure in interface Measurable

Parameters:

config - The configuration for this metric

now - The POSIX time in milliseconds the measurement is being taken

Returns:

The measured value

windowSize

public long windowSize(MetricConfig config,
                       long now)

toString

public String toString()

Overrides:

toString in class Object