com.bigdata.service.ndx

Class NopAggregator<R,A>

java.lang.Object

com.bigdata.service.ndx.NopAggregator<R,A>

Type Parameters:

R -

A -

All Implemented Interfaces:

IResultHandler<R,A>

public class NopAggregator<R,A>
extends Object
implements IResultHandler<R,A>

NOP aggregator does nothing and returns null. This is used for parallelizing operations that require a result handler to stripe them against the index.

Author:

bryan

See Also:

(Schedule more IOs when loading data)

Field Summary

Fields

Modifier and Type	Field and Description
static IResultHandler	INSTANCE

Constructor Summary

Constructors

Constructor and Description
NopAggregator()

Method Summary

Methods

Modifier and Type	Method and Description
void	aggregate(R result, Split split) Method is invoked for each result and is responsible for combining the results in whatever manner is meaningful for the procedure.
A	getResult() Return the aggregated results as an implementation dependent object.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final IResultHandler INSTANCE

Constructor Detail

NopAggregator

public NopAggregator()

Method Detail

aggregate

public void aggregate(R result,
             Split split)

Description copied from interface: IResultHandler

Method is invoked for each result and is responsible for combining the results in whatever manner is meaningful for the procedure. Implementations of this method MUST be thread-safe since the procedure MAY be applied in parallel when it spans more than one index partition.

Specified by:

aggregate in interface IResultHandler<R,A>

Parameters:

result - The result from applying the procedure to a single index partition.

split - The Split that generated that result.

getResult

public A getResult()

Description copied from interface: IResultHandler

Return the aggregated results as an implementation dependent object.

Specified by:

getResult in interface IResultHandler<R,A>