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:
- MetricsContext
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.
Constructor Summary |
NullContext()
Creates a new instance of NullContext |
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 |
NullContext
public NullContext()
- Creates a new instance of NullContext
startMonitoring
public void startMonitoring()
- Do-nothing version of startMonitoring
- Specified by:
startMonitoring
in interface MetricsContext
- Overrides:
startMonitoring
in class AbstractMetricsContext
emitRecord
protected void emitRecord(String contextName,
String recordName,
OutputRecord outRec)
- Do-nothing version of emitRecord
- Specified by:
emitRecord
in class AbstractMetricsContext
update
protected void update(MetricsRecordImpl record)
- Do-nothing version of update
- Overrides:
update
in class AbstractMetricsContext
remove
protected void remove(MetricsRecordImpl record)
- Do-nothing version of remove
- Overrides:
remove
in class AbstractMetricsContext
Copyright © 2009 The Apache Software Foundation