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java.lang.Object org.apache.hadoop.metrics.spi.AbstractMetricsContext org.apache.hadoop.metrics.spi.NullContext
public class NullContext
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 |
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Fields inherited from interface org.apache.hadoop.metrics.MetricsContext |
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DEFAULT_PERIOD |
Constructor Summary | |
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NullContext()
Creates a new instance of NullContext |
Method Summary | |
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protected void |
emitRecord(String contextName,
String recordName,
OutputRecord outRec)
Do-nothing version of emitRecord |
protected void |
remove(MetricsRecordImpl record)
Do-nothing version of remove |
void |
startMonitoring()
Do-nothing version of startMonitoring |
protected void |
update(MetricsRecordImpl record)
Do-nothing version of update |
Methods inherited from class org.apache.hadoop.metrics.spi.AbstractMetricsContext |
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close, createRecord, flush, getAttribute, getAttributeTable, getContextFactory, getContextName, getPeriod, init, isMonitoring, newRecord, registerUpdater, setPeriod, stopMonitoring, unregisterUpdater |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public NullContext()
Method Detail |
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public void startMonitoring()
startMonitoring
in interface MetricsContext
startMonitoring
in class AbstractMetricsContext
protected void emitRecord(String contextName, String recordName, OutputRecord outRec)
emitRecord
in class AbstractMetricsContext
protected void update(MetricsRecordImpl record)
update
in class AbstractMetricsContext
protected void remove(MetricsRecordImpl record)
remove
in class AbstractMetricsContext
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