/*
    * 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;
    }
  }