| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hama.graph; |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hama.HamaConfiguration; |
| import org.apache.hama.bsp.Counters.Counter; |
| |
| /** |
| * The vertex interface. |
| * |
| * @param <V> this type must be writable and should also implement equals and |
| * hashcode. |
| * @param <E> the type used for storing edge values, usually the value of an |
| * edge. |
| * @param <M> the type used for messaging, usually the value of a vertex. |
| */ |
| @SuppressWarnings("rawtypes") |
| public interface VertexInterface<V extends WritableComparable, E extends Writable, M extends Writable> |
| extends WritableComparable<VertexInterface<V, E, M>> { |
| |
| /** |
| * This method is called once before the Vertex computation begins. Since the |
| * Vertex object is serializable, variables in your Vertex program always |
| * should be declared a s static. |
| * |
| */ |
| public void setup(HamaConfiguration conf); |
| |
| /** |
| * @return the unique identification for the vertex. |
| */ |
| public V getVertexID(); |
| |
| /** |
| * @return the total number of vertices. |
| */ |
| public long getTotalNumVertices(); |
| |
| /** |
| * The user-defined function. |
| */ |
| public void compute(Iterable<M> messages) throws IOException; |
| |
| /** |
| * @return a list of outgoing edges of this vertex in the input graph. |
| */ |
| public List<Edge<V, E>> getEdges(); |
| |
| /** |
| * Sends a message to another vertex. |
| */ |
| public void sendMessage(Edge<V, E> e, M msg) throws IOException; |
| |
| /** |
| * Sends a message to neighbors |
| */ |
| public void sendMessageToNeighbors(M msg) throws IOException; |
| |
| /** |
| * Sends a message to the given destination vertex by ID and the message value |
| */ |
| public void sendMessage(V destinationVertexID, M msg) throws IOException; |
| |
| /** |
| * Sends a message to add a new vertex through the partitioner to the |
| * appropriate BSP peer |
| */ |
| public void addVertex(V vertexID, List<Edge<V, E>> edges, M value) |
| throws IOException; |
| |
| /** |
| * Removes current Vertex from local peer. |
| */ |
| public void remove() throws IOException; |
| |
| /** |
| * @return the superstep number of the current superstep (starting from 0). |
| */ |
| public long getSuperstepCount(); |
| |
| /** |
| * Vote to halt. |
| */ |
| public void voteToHalt(); |
| |
| /** |
| * Sets the vertex value |
| */ |
| public void setValue(M value); |
| |
| /** |
| * Gets the vertex value |
| */ |
| public M getValue(); |
| |
| /** |
| * Provides a value to the specified aggregator. |
| * |
| * @throws IOException |
| * |
| * @param index identifies a aggregator |
| * @param value value to be aggregated |
| */ |
| public void aggregate(int index, M value) throws IOException; |
| |
| /** |
| * Returns the value of the specified aggregator. |
| */ |
| public Writable getAggregatedValue(int index); |
| |
| /** Counters */ |
| public Counter getCounter(Enum<?> name); |
| |
| public Counter getCounter(String group, String name); |
| } |