Package org.apache.hadoop.fs.statistics.impl

Class IOStatisticsContextImpl

java.lang.Object

org.apache.hadoop.fs.statistics.impl.IOStatisticsContextImpl

All Implemented Interfaces:

IOStatisticsContext, IOStatisticsSource

public final class IOStatisticsContextImpl
extends java.lang.Object
implements IOStatisticsContext

Implementing the IOStatisticsContext. A Context defined for IOStatistics collection per thread which captures each worker thread's work in FS streams and stores it in the form of IOStatisticsSnapshot. For the current thread the IOStatisticsSnapshot can be used as a way to move the IOStatistics data between applications using the Serializable nature of the class.

Constructor Summary

Constructors

Constructor	Description
IOStatisticsContextImpl(long threadId, long id)	Constructor.

Method Summary

Modifier and Type	Method	Description
IOStatisticsAggregator	getAggregator()	Get the IOStatisticsAggregator of the context.
long	getID()	ID of this context.
IOStatistics	getIOStatistics()	Return a statistics instance.
long	getThreadID()	Get the thread ID.
void	reset()	Reset the thread +.
IOStatisticsSnapshot	snapshot()	Returns a snapshot of the current thread's IOStatistics.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

IOStatisticsContextImpl

public IOStatisticsContextImpl(long threadId,
                               long id)

Constructor.

Parameters:

threadId - thread ID

id - instance ID.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getAggregator

public IOStatisticsAggregator getAggregator()

Get the IOStatisticsAggregator of the context.

Specified by:

getAggregator in interface IOStatisticsContext

Returns:

the instance of IOStatisticsAggregator for this context.

snapshot

public IOStatisticsSnapshot snapshot()

Returns a snapshot of the current thread's IOStatistics.

Specified by:

snapshot in interface IOStatisticsContext

Returns:

IOStatisticsSnapshot of the context.

reset

public void reset()

Reset the thread +.

Specified by:

reset in interface IOStatisticsContext

getIOStatistics

public IOStatistics getIOStatistics()

Description copied from interface: IOStatisticsSource

Return a statistics instance.

It is not a requirement that the same instance is returned every time. IOStatisticsSource.

If the object implementing this is Closeable, this method may return null if invoked on a closed object, even if it returns a valid instance when called earlier.

Specified by:

getIOStatistics in interface IOStatisticsSource

Returns:

an IOStatistics instance or null

getID

public long getID()

ID of this context.

Specified by:

getID in interface IOStatisticsContext

Returns:

ID.

getThreadID

public long getThreadID()

Get the thread ID.

Returns:

thread ID.