1/*2 * Licensed to the Apache Software Foundation (ASF) under one3 * or more contributor license agreements. See the NOTICE file4 * distributed with this work for additional information5 * regarding copyright ownership. The ASF licenses this file6 * to you under the Apache License, Version 2.0 (the7 * "License"); you may not use this file except in compliance8 * with the License. You may obtain a copy of the License at9 *10 * http://www.apache.org/licenses/LICENSE-2.011 *12 * Unless required by applicable law or agreed to in writing, software13 * 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 and16 * limitations under the License.17 */1819package org.apache.giraph.examples;
2021import org.apache.giraph.graph.BasicComputation;
22import org.apache.hadoop.io.LongWritable;
23import org.apache.hadoop.io.DoubleWritable;
24import org.apache.giraph.graph.Vertex;
2526import java.io.IOException;
2728/**29 * Simple function to return the out degree for each vertex.30 */31 @Algorithm(
32 name = "Outdegree Count"33 )
34publicclassSimpleOutDegreeCountComputationextends BasicComputation<
35 LongWritable, LongWritable, DoubleWritable, DoubleWritable> {
3637 @Override
38publicvoid compute(
39 Vertex<LongWritable, LongWritable, DoubleWritable> vertex,
40 Iterable<DoubleWritable> messages) throws IOException {
41 LongWritable vertexValue = vertex.getValue();
42 vertexValue.set(vertex.getNumEdges());
43 vertex.setValue(vertexValue);
44 vertex.voteToHalt();
45 }
46 }