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WorkerReduceUsage 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  package org.apache.giraph.worker;
19  
20  import org.apache.hadoop.io.Writable;
21  
22  /**
23   * Methods on worker can provide values to reduce through this interface
24   */
25  public interface WorkerReduceUsage {
26    /**
27     * Reduce given value.
28     * @param name Name of the reducer
29     * @param value Single value to reduce
30     */
31    void reduce(String name, Object value);
32  
33    /**
34     * Reduce given partial value.
35     * @param name Name of the reducer
36     * @param value Single value to reduce
37     */
38    void reduceMerge(String name, Writable value);
39  }