org.apache.giraph.aggregators

Class DoubleSumAggregator

java.lang.Object

org.apache.giraph.aggregators.BasicAggregator<org.apache.hadoop.io.DoubleWritable>

org.apache.giraph.aggregators.DoubleSumAggregator

All Implemented Interfaces:

Aggregator<org.apache.hadoop.io.DoubleWritable>

public class DoubleSumAggregator
extends BasicAggregator<org.apache.hadoop.io.DoubleWritable>

Aggregator for summing up double values.

Constructor Summary

Constructors

Constructor and Description
DoubleSumAggregator()

Method Summary

Modifier and Type	Method and Description
void	aggregate(org.apache.hadoop.io.DoubleWritable value) Add a new value.
org.apache.hadoop.io.DoubleWritable	createInitialValue() Return new aggregated value which is neutral to aggregate operation.

Methods inherited from class org.apache.giraph.aggregators.BasicAggregator

getAggregatedValue, reset, setAggregatedValue

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleSumAggregator

public DoubleSumAggregator()

Method Detail

aggregate

public void aggregate(org.apache.hadoop.io.DoubleWritable value)

Description copied from interface: Aggregator

Add a new value. Needs to be commutative and associative

Parameters:

value - Value to be aggregated.

createInitialValue

public org.apache.hadoop.io.DoubleWritable createInitialValue()

Description copied from interface: Aggregator

Return new aggregated value which is neutral to aggregate operation. Must be changeable without affecting internals of Aggregator

Returns:

Neutral value