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ComputationCountEdges xref
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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  }