org.apache.hadoop.metrics.spi

Class NoEmitMetricsContext

java.lang.Object

org.apache.hadoop.metrics.spi.AbstractMetricsContext

org.apache.hadoop.metrics.spi.NoEmitMetricsContext

All Implemented Interfaces:

MetricsContext

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

A MetricsContext that does not emit data, but, unlike NullContextWithUpdate, does save it for retrieval with getAllRecords(). This is useful if you want to support MetricsServlet, but not emit metrics in any other way.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.metrics.spi.AbstractMetricsContext

AbstractMetricsContext.MetricMap, AbstractMetricsContext.TagMap

Field Summary

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

DEFAULT_PERIOD

Constructor Summary

Constructors

Constructor and Description
NoEmitMetricsContext() Creates a new instance of NullContextWithUpdateThread

Method Summary

Methods

Modifier and Type	Method and Description
protected void	emitRecord(String contextName, String recordName, OutputRecord outRec) Do-nothing version of emitRecord
void	init(String contextName, ContextFactory factory) Initializes the context.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

NoEmitMetricsContext

@InterfaceAudience.Private
public NoEmitMetricsContext()

Creates a new instance of NullContextWithUpdateThread

Method Detail

init

@InterfaceAudience.Private
public void init(String contextName,
                                  ContextFactory factory)

Description copied from class: AbstractMetricsContext

Initializes the context.

Specified by:

init in interface MetricsContext

Overrides:

init in class AbstractMetricsContext

Parameters:

contextName - The given name for this context

factory - The creator of this context

emitRecord

@InterfaceAudience.Private
protected void emitRecord(String contextName,
                                        String recordName,
                                        OutputRecord outRec)

Do-nothing version of emitRecord

Specified by:

emitRecord in class AbstractMetricsContext