org.apache.flink.graph.asm.degree.annotate

Class DegreeAnnotationFunctions.DegreeCount<K>

java.lang.Object

org.apache.flink.graph.asm.degree.annotate.DegreeAnnotationFunctions.DegreeCount<K>

Type Parameters:

K - ID type

All Implemented Interfaces:

Serializable, Function, ReduceFunction<Vertex<K,LongValue>>

Enclosing class:

DegreeAnnotationFunctions

public static class DegreeAnnotationFunctions.DegreeCount<K>
extends Object
implements ReduceFunction<Vertex<K,LongValue>>

Combines the vertex degree count.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DegreeCount()

Method Summary

Modifier and Type	Method and Description
Vertex<K,LongValue>	reduce(Vertex<K,LongValue> left, Vertex<K,LongValue> right) The core method of ReduceFunction, combining two values into one value of the same type.

Methods inherited from class java.lang.Object

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

Constructor Detail

DegreeCount

public DegreeCount()

Method Detail

reduce

public Vertex<K,LongValue> reduce(Vertex<K,LongValue> left,
                                  Vertex<K,LongValue> right)
                           throws Exception

Description copied from interface: ReduceFunction

The core method of ReduceFunction, combining two values into one value of the same type. The reduce function is consecutively applied to all values of a group until only a single value remains.

Specified by:

reduce in interface ReduceFunction<Vertex<K,LongValue>>

Parameters:

left - The first value to combine.

right - The second value to combine.

Returns:

The combined value of both input values.

Throws:

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