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DoubleSumMessageCombiner 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.combiner;
20  
21  import org.apache.hadoop.io.DoubleWritable;
22  import org.apache.hadoop.io.WritableComparable;
23  
24  /**
25   * A combiner that sums double-valued messages
26   *
27   * Use SumMessageCombiner.DOUBLE instead.
28   */
29  @Deprecated()
30  public class DoubleSumMessageCombiner
31      implements MessageCombiner<WritableComparable, DoubleWritable> {
32    @Override
33    public void combine(WritableComparable vertexIndex,
34        DoubleWritable originalMessage, DoubleWritable messageToCombine) {
35      originalMessage.set(originalMessage.get() + messageToCombine.get());
36    }
37  
38    @Override
39    public DoubleWritable createInitialMessage() {
40      return new DoubleWritable(0);
41    }
42  }