org.apache.giraph.graph

Interface VertexResolver<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Type Parameters:

I - Vertex id

V - Vertex data

E - Edge data

All Known Implementing Classes:

DefaultVertexResolver

public interface VertexResolver<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Handles all the situations that can arise upon creation/removal of vertices and edges.

Method Summary

Modifier and Type	Method and Description
Vertex<I,V,E>	resolve(I vertexId, Vertex<I,V,E> vertex, VertexChanges<I,V,E> vertexChanges, boolean hasMessages) A vertex may have been removed, created zero or more times and had zero or more messages sent to it.

Method Detail

resolve

Vertex<I,V,E> resolve(I vertexId,
                      Vertex<I,V,E> vertex,
                      VertexChanges<I,V,E> vertexChanges,
                      boolean hasMessages)

A vertex may have been removed, created zero or more times and had zero or more messages sent to it. This method will handle all situations excluding the normal case (a vertex already exists and has zero or more messages sent it to).

Parameters:

vertexId - Vertex id (can be used for Vertex's initialize())

vertex - Original vertex or null if none

vertexChanges - Changes that happened to this vertex or null if none

hasMessages - True iff vertex received messages in the last superstep

Returns:

Vertex to be returned, if null, and a vertex currently exists it will be removed