io.kgraph.streaming

Interface EdgeFoldFunction<K,EV,T>

Type Parameters:

K - the vertex ID type

EV - the edge value type

T - the accumulator type

All Known Implementing Classes:

BipartitenessCheck.UpdateFunction, ConnectedComponents.UpdateCC, Spanner.UpdateLocal

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface EdgeFoldFunction<K,EV,T>

Interface to be implemented by the function applied to a vertex neighborhood in the KGraphWindowedStream.foldNeighbors(Object, EdgeFoldFunction) method.

Method Summary

Modifier and Type	Method and Description
T	foldEdges(T accum, K vertexID, K neighborID, EV edgeValue) Combines two edge values into one value of the same type.

Method Detail

foldEdges

T foldEdges(T accum,
            K vertexID,
            K neighborID,
            EV edgeValue)

Combines two edge values into one value of the same type. The foldEdges function is consecutively applied to all edges of a neighborhood, until only a single value remains.

Parameters:

accum - the initial value and accumulator

vertexID - the vertex ID

neighborID - the neighbor's ID

edgeValue - the edge value

Returns:

The data stream that is the result of applying the foldEdges function to the graph window.