org.apache.hama.graph

Class SumAggregator

java.lang.Object

org.apache.hama.graph.AbstractAggregator<org.apache.hadoop.io.DoubleWritable,Vertex<?,?,org.apache.hadoop.io.DoubleWritable>>

org.apache.hama.graph.SumAggregator

All Implemented Interfaces:

Aggregator<org.apache.hadoop.io.DoubleWritable,Vertex<?,?,org.apache.hadoop.io.DoubleWritable>>

public class SumAggregator
extends AbstractAggregator<org.apache.hadoop.io.DoubleWritable,Vertex<?,?,org.apache.hadoop.io.DoubleWritable>>

Sums all vertex values globally.

Constructor Summary

Constructors

Constructor and Description
SumAggregator()

Method Summary

Methods

Modifier and Type	Method and Description
void	aggregate(Vertex<?,?,org.apache.hadoop.io.DoubleWritable> vertex, org.apache.hadoop.io.DoubleWritable value) Observes a value of a vertex after the compute method.
org.apache.hadoop.io.DoubleWritable	getValue() Gets the value of the aggregator.

Methods inherited from class org.apache.hama.graph.AbstractAggregator

aggregate, finalizeAggregation, getTimesAggregated

Methods inherited from class java.lang.Object

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

Constructor Detail

SumAggregator

public SumAggregator()

Method Detail

aggregate

public void aggregate(Vertex<?,?,org.apache.hadoop.io.DoubleWritable> vertex,
             org.apache.hadoop.io.DoubleWritable value)

Description copied from class: AbstractAggregator

Observes a value of a vertex after the compute method. This is intended to be overriden by the user and is just an empty implementation in this class. Please make sure that you are null-checking vertex, since on a master task this will always be null.

Specified by:

aggregate in interface Aggregator<org.apache.hadoop.io.DoubleWritable,Vertex<?,?,org.apache.hadoop.io.DoubleWritable>>

Overrides:

aggregate in class AbstractAggregator<org.apache.hadoop.io.DoubleWritable,Vertex<?,?,org.apache.hadoop.io.DoubleWritable>>

getValue

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

Description copied from class: AbstractAggregator

Gets the value of the aggregator. This is intended to be overridden by the user and is just an empty implementation in this class (returns null).

Specified by:

getValue in interface Aggregator<org.apache.hadoop.io.DoubleWritable,Vertex<?,?,org.apache.hadoop.io.DoubleWritable>>

Overrides:

getValue in class AbstractAggregator<org.apache.hadoop.io.DoubleWritable,Vertex<?,?,org.apache.hadoop.io.DoubleWritable>>