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ReducerHandle 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.block_app.framework.piece.global_comm;
19  
20  import org.apache.giraph.block_app.framework.api.BlockMasterApi;
21  import org.apache.giraph.master.MasterGlobalCommUsage;
22  
23  /**
24   * Handle to a reducer.
25   *
26   * @param <S> Single value type
27   * @param <R> Reduced value type
28   */
29  public interface ReducerHandle<S, R> {
30    /** Reduce single value */
31    void reduce(S valueToReduce);
32    /** Get reduced value */
33    R getReducedValue(MasterGlobalCommUsage master);
34  
35    /**
36     * Broadcast reduced value from master
37     *
38     * @return Handle to the broadcasted value.
39     */
40    BroadcastHandle<R> broadcastValue(BlockMasterApi master);
41  }