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NoOpComputation 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.Writable;
24  import org.apache.hadoop.io.WritableComparable;
25  
26  import java.io.IOException;
27  
28  /**
29   * Computation which does nothing, just halts, used for testing
30   *
31   * @param <I> Vertex id
32   * @param <V> Vertex data
33   * @param <E> Edge data
34   * @param <M> Message data
35   */
36  public class NoOpComputation<I extends WritableComparable, V extends Writable,
37      E extends Writable, M extends Writable>
38      extends BasicComputation<I, V, E, M> {
39    @Override
40    public void compute(Vertex<I, V, E> vertex,
41        Iterable<M> messages) throws IOException {
42      vertex.voteToHalt();
43    }
44  }