﻿// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

using System;
using Org.Apache.REEF.IMRU.API;
using Org.Apache.REEF.Tang.Annotations;
using Org.Apache.REEF.Utilities.Diagnostics;
using Org.Apache.REEF.Utilities.Logging;

namespace Org.Apache.REEF.IMRU.Examples.PipelinedBroadcastReduce
{
    /// <summary>
    /// Map function for integer array broadcast and reduce
    /// </summary>
    internal sealed class BroadcastReceiverReduceSenderMapFunction : IMapFunction<int[], int[]>
    {
        private static readonly Logger Logger = Logger.GetLogger(typeof(BroadcastReceiverReduceSenderMapFunction));

        private int _iterations;

        [Inject]
        private BroadcastReceiverReduceSenderMapFunction()
        {
        }

        /// <summary>
        /// Map function
        /// </summary>
        /// <param name="mapInput">integer array</param>
        /// <returns>The same integer array</returns>
        int[] IMapFunction<int[], int[]>.Map(int[] mapInput)
        {
            _iterations++;

            Logger.Log(Level.Info, string.Format("Received value {0}", mapInput[0]));

            if (mapInput[0] != _iterations)
            {
                Exceptions.Throw(new Exception("Expected value in mappers different from actual value"), Logger);
            }

            return mapInput;
        }
    }
}