/*

  * 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.OwnerAggregatorServerData;

 import org.apache.giraph.utils.UnsafeByteArrayInputStream;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.Writable;

 /**

  * Request to send partial aggregated values for current superstep (values

  * which were computed by one worker's vertices)

  */

 public class SendWorkerAggregatorsRequest extends

     ByteArrayWithSenderTaskIdRequest implements WorkerRequest {

   /**

    * Constructor

    *

    * @param data Serialized aggregator data

    * @param senderTaskId Sender task id

    */

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

     super(data, senderTaskId);

   }

   /**

    * Constructor used for reflection only

    */

   public SendWorkerAggregatorsRequest() {

   }

   @Override

   public void doRequest(ServerData serverData) {

     UnsafeByteArrayInputStream input = getUnsafeByteArrayInput();

     OwnerAggregatorServerData aggregatorData =

         serverData.getOwnerAggregatorData();

     try {

       int num = input.readInt();

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

         String name = input.readUTF();

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

         if (type == GlobalCommType.SPECIAL_COUNT) {

           LongWritable value = new LongWritable();

           value.readFields(input);

           aggregatorData.receivedRequestCountFromWorker(

               value.get(),

               getSenderTaskId());

         } else if (type == GlobalCommType.REDUCED_VALUE) {

           Writable value = aggregatorData.createInitialValue(name);

           value.readFields(input);

           aggregatorData.reduce(name, value);

         } else {

           throw new IllegalStateException(

               "SendWorkerAggregatorsRequest received " + type);

         }

       }

     } catch (IOException e) {

       throw new IllegalStateException("doRequest: " +

           "IOException occurred while processing request", e);

     }

     aggregatorData.receivedRequestFromWorker();

   }

   @Override

   public RequestType getType() {

     return RequestType.SEND_WORKER_AGGREGATORS_REQUEST;

   }

 }