org.apache.hadoop.metrics.spi

Class NullContext

java.lang.Object

org.apache.hadoop.metrics.spi.AbstractMetricsContext

org.apache.hadoop.metrics.spi.NullContext

All Implemented Interfaces:

org.apache.hadoop.metrics.MetricsContext

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class NullContext
extends AbstractMetricsContext

Null metrics context: a metrics context which does nothing. Used as the default context, so that no performance data is emitted if no configuration data is found.

Field Summary

Fields inherited from interface org.apache.hadoop.metrics.MetricsContext

DEFAULT_PERIOD

Constructor Summary

Constructors

Constructor and Description
NullContext() Creates a new instance of NullContext

Method Summary

Methods inherited from class org.apache.hadoop.metrics.spi.AbstractMetricsContext

close, createRecord, flush, getAllRecords, getAttribute, getAttributeTable, getContextFactory, getContextName, getPeriod, init, isMonitoring, newRecord, parseAndSetPeriod, registerUpdater, setPeriod, stopMonitoring, unregisterUpdater

Methods inherited from class java.lang.Object

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

Constructor Detail

NullContext

@InterfaceAudience.Private
public NullContext()

Creates a new instance of NullContext