org.apache.flink.examples.java.clustering

Class KMeans.SelectNearestCenter

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichMapFunction<KMeans.Point,Tuple2<Integer,KMeans.Point>>

org.apache.flink.examples.java.clustering.KMeans.SelectNearestCenter

All Implemented Interfaces:

Serializable, Function, MapFunction<KMeans.Point,Tuple2<Integer,KMeans.Point>>, RichFunction

Enclosing class:

KMeans

public static final class KMeans.SelectNearestCenter
extends RichMapFunction<KMeans.Point,Tuple2<Integer,KMeans.Point>>

Determines the closest cluster center for a data point.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SelectNearestCenter()

Method Summary

Modifier and Type	Method and Description
Tuple2<Integer,KMeans.Point>	map(KMeans.Point p) The mapping method.
void	open(Configuration parameters) Reads the centroid values from a broadcast variable into a collection.

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectNearestCenter

public SelectNearestCenter()

Method Detail

open

public void open(Configuration parameters)
          throws Exception

Reads the centroid values from a broadcast variable into a collection.

Specified by:

open in interface RichFunction

Overrides:

open in class AbstractRichFunction

Parameters:

parameters - The configuration containing the parameters attached to the contract.

Throws:

Exception - Implementations may forward exceptions, which are caught by the runtime. When the runtime catches an exception, it aborts the task and lets the fail-over logic decide whether to retry the task execution.

See Also:

Configuration

map

public Tuple2<Integer,KMeans.Point> map(KMeans.Point p)
                                 throws Exception

Description copied from interface: MapFunction

The mapping method. Takes an element from the input data set and transforms it into exactly one element.

Specified by:

map in interface MapFunction<KMeans.Point,Tuple2<Integer,KMeans.Point>>

Specified by:

map in class RichMapFunction<KMeans.Point,Tuple2<Integer,KMeans.Point>>

Parameters:

p - The input value.

Returns:

The transformed value

Throws:

Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.