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.vortex.api.VortexAggregateException;
022import org.apache.reef.vortex.api.VortexAggregateFunction;
023
024import java.util.List;
025
026/**
027 * Aggregates and sums the outputs.
028 */
029public final class AdditionAggregateFunction implements VortexAggregateFunction<Integer> {
030  @Override
031  public Integer call(final List<Integer> taskletOutputs) throws VortexAggregateException {
032    int sum = 0;
033    for (final int output : taskletOutputs) {
034      sum += output;
035    }
036
037    return sum;
038  }
039}