1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.examples; 20 21 import org.apache.giraph.graph.BasicComputation; 22 import org.apache.giraph.graph.Vertex; 23 import org.apache.hadoop.io.Writable; 24 import org.apache.hadoop.io.WritableComparable; 25 26 import java.io.IOException; 27 28 /** 29 * User applications can subclass IdentityComputation, which 30 * simply prints the results that have been read for testing IO related 31 * jobs under any inputformat 32 * 33 * @param <I> Vertex index value 34 * @param <V> Vertex value 35 * @param <E> Edge value 36 * @param <M> Message value 37 */ 38 @SuppressWarnings("rawtypes") 39 public class IdentityComputation<I extends WritableComparable, 40 V extends Writable, E extends Writable, M extends Writable> 41 extends BasicComputation<I, V, E, M> { 42 @Override 43 public void compute(Vertex<I, V, E> vertex, 44 Iterable<M> messages) throws IOException { 45 vertex.voteToHalt(); 46 } 47 }