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.utils; 20 21 import org.apache.giraph.graph.BasicComputation; 22 import org.apache.giraph.graph.Vertex; 23 import org.apache.hadoop.io.IntWritable; 24 import org.apache.hadoop.io.NullWritable; 25 26 import java.io.IOException; 27 28 /** 29 * Computation which sets the value of vertex to its number of edges, 30 * used for testing. Vertex ids, values, edge values and messages are all 31 * integers. 32 */ 33 public class ComputationCountEdges extends BasicComputation<IntWritable, 34 IntWritable, NullWritable, NullWritable> { 35 @Override 36 public void compute(Vertex<IntWritable, IntWritable, NullWritable> vertex, 37 Iterable<NullWritable> messages) throws IOException { 38 vertex.setValue(new IntWritable(vertex.getNumEdges())); 39 vertex.voteToHalt(); 40 } 41 }