org.apache.hadoop.metrics2.lib

Class MutableMetric

java.lang.Object

org.apache.hadoop.metrics2.lib.MutableMetric

Direct Known Subclasses:

MutableCounter, MutableGauge, MutableQuantiles, MutableRates, MutableRatesWithAggregation, MutableRollingAverages, MutableStat

@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class MutableMetric
extends Object

The mutable metric interface

Constructor Summary

Constructors

Constructor and Description
MutableMetric()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	changed()
protected void	clearChanged() Clear the changed flag in the snapshot operations
protected void	setChanged() Set the changed flag in mutable operations
void	snapshot(MetricsRecordBuilder builder) Get a snapshot of metric if changed
abstract void	snapshot(MetricsRecordBuilder builder, boolean all) Get a snapshot of the metric

Methods inherited from class java.lang.Object

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

Constructor Detail

MutableMetric

public MutableMetric()

Method Detail

snapshot

public abstract void snapshot(MetricsRecordBuilder builder,
            boolean all)

Get a snapshot of the metric

Parameters:

builder - the metrics record builder

all - if true, snapshot unchanged metrics as well

snapshot

public void snapshot(MetricsRecordBuilder builder)

Get a snapshot of metric if changed

Parameters:

builder - the metrics record builder

setChanged

protected void setChanged()

Set the changed flag in mutable operations

clearChanged

protected void clearChanged()

Clear the changed flag in the snapshot operations

changed

public boolean changed()

Returns:

true if metric is changed since last snapshot/snapshot