/*

  * 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.

  */

 package org.apache.giraph.comm.requests;

 import java.io.IOException;

 import org.apache.giraph.comm.GlobalCommType;

 import org.apache.giraph.comm.ServerData;

 import org.apache.giraph.comm.aggregators.AllAggregatorServerData;

 import org.apache.giraph.reducers.ReduceOperation;

 import org.apache.giraph.utils.UnsafeByteArrayInputStream;

 import org.apache.giraph.utils.UnsafeByteArrayOutputStream;

 import org.apache.giraph.utils.UnsafeReusableByteArrayInput;

 import org.apache.giraph.utils.WritableUtils;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.Writable;

 /**

  * Request to send final aggregatd values from master to worker which owns

  * the aggregators

  */

 public class SendAggregatorsToOwnerRequest

     extends ByteArrayWithSenderTaskIdRequest implements WorkerRequest {

   /**

    * Constructor

    *

    * @param data Serialized aggregator data

    * @param senderTaskId Sender task id

    */

   public SendAggregatorsToOwnerRequest(byte[] data, int senderTaskId) {

     super(data, senderTaskId);

   }

   /**

    * Constructor used for reflection only

    */

   public SendAggregatorsToOwnerRequest() {

   }

   @Override

   public void doRequest(ServerData serverData) {

     UnsafeByteArrayOutputStream reusedOut = new UnsafeByteArrayOutputStream();

     UnsafeReusableByteArrayInput reusedIn = new UnsafeReusableByteArrayInput();

     UnsafeByteArrayInputStream input = getUnsafeByteArrayInput();

     AllAggregatorServerData aggregatorData = serverData.getAllAggregatorData();

     try {

       int num = input.readInt();

       for (int i = 0; i < num; i++) {

         String name = input.readUTF();

         GlobalCommType type = GlobalCommType.values()[input.readByte()];

         Writable value = WritableUtils.readWritableObject(input, conf);

         if (type == GlobalCommType.SPECIAL_COUNT) {

           aggregatorData.receivedRequestCountFromMaster(

               ((LongWritable) value).get(),

               getSenderTaskId());

         } else {

           aggregatorData.receiveValueFromMaster(name, type, value);

           if (type == GlobalCommType.REDUCE_OPERATIONS) {

             ReduceOperation<Object, Writable> reduceOpCopy =

                 (ReduceOperation<Object, Writable>)

                 WritableUtils.createCopy(reusedOut, reusedIn, value, conf);

             serverData.getOwnerAggregatorData().registerReducer(

                 name, reduceOpCopy);

           }

         }

       }

     } catch (IOException e) {

       throw new IllegalStateException("doRequest: " +

           "IOException occurred while processing request", e);

     }

     aggregatorData.receivedRequestFromMaster(getData());

   }

   @Override

   public RequestType getType() {

     return RequestType.SEND_AGGREGATORS_TO_OWNER_REQUEST;

   }

 }