Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.vortex.examples.sumones;
020
021import org.apache.reef.io.serialization.Codec;
022import org.apache.reef.io.serialization.SerializableCodec;
023import org.apache.reef.vortex.api.VortexAggregateException;
024import org.apache.reef.vortex.api.VortexAggregateFunction;
025
026import java.util.List;
027
028/**
029 * Aggregates and sums the outputs.
030 */
031public final class AdditionAggregateFunction implements VortexAggregateFunction<Integer> {
032  private static final Codec<Integer> CODEC = new SerializableCodec<>();
033
034  @Override
035  public Integer call(final List<Integer> taskletOutputs) throws VortexAggregateException {
036    int sum = 0;
037    for (final int output : taskletOutputs) {
038      sum += output;
039    }
040
041    return sum;
042  }
043
044  @Override
045  public Codec<Integer> getOutputCodec() {
046    return CODEC;
047  }
048}