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NoOpSuperstepOutput 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.io.superstep_output;
20  
21  import org.apache.giraph.graph.Vertex;
22  import org.apache.giraph.io.SimpleVertexWriter;
23  import org.apache.hadoop.io.Writable;
24  import org.apache.hadoop.io.WritableComparable;
25  
26  import java.io.IOException;
27  
28  /**
29   * Class to use as {@link SuperstepOutput} when we don't have output during
30   * computation. All the methods are no-ops.
31   *
32   * @param <I> Vertex id
33   * @param <V> Vertex value
34   * @param <E> Edge value
35   */
36  public class NoOpSuperstepOutput<I extends WritableComparable,
37      V extends Writable, E extends Writable> implements
38      SuperstepOutput<I, V, E> {
39    @Override
40    public SimpleVertexWriter<I, V, E> getVertexWriter() {
41      return new SimpleVertexWriter<I, V, E>() {
42        @Override
43        public void writeVertex(Vertex<I, V, E> vertex) throws IOException,
44            InterruptedException {
45        }
46      };
47    }
48  
49    @Override
50    public void returnVertexWriter(
51        SimpleVertexWriter<I, V, E> vertexWriter) {
52    }
53  
54    @Override
55    public void postApplication() {
56    }
57  }