/*

  * 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 org.apache.giraph.comm.ServerData;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.utils.ExtendedDataOutput;

 import org.apache.giraph.utils.PairList;

 import org.apache.giraph.utils.WritableUtils;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 import org.apache.log4j.Logger;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 /**

  * Send to a worker one or more partitions of vertices

  *

  * @param <I> Vertex id

  * @param <V> Vertex data

  * @param <E> Edge data

  */

 @SuppressWarnings("rawtypes")

 public class SendWorkerVerticesRequest<I extends WritableComparable,

     V extends Writable, E extends Writable> extends

     WritableRequest<I, V, E> implements WorkerRequest<I, V, E> {

   /** Class logger */

   private static final Logger LOG =

       Logger.getLogger(SendWorkerVerticesRequest.class);

   /** Worker partitions to be sent */

   private PairList<Integer, ExtendedDataOutput> workerPartitions;

   /**

    * Constructor used for reflection only

    */

   public SendWorkerVerticesRequest() { }

   /**

    * Constructor for sending a request.

    *

    * @param conf Configuration

    * @param workerPartitions Partitions to be send in this request

    */

   public SendWorkerVerticesRequest(

       ImmutableClassesGiraphConfiguration<I, V, E> conf,

       PairList<Integer, ExtendedDataOutput> workerPartitions) {

     this.workerPartitions = workerPartitions;

     setConf(conf);

   }

   @Override

   public void readFieldsRequest(DataInput input) throws IOException {

     int numPartitions = input.readInt();

     workerPartitions = new PairList<Integer, ExtendedDataOutput>();

     workerPartitions.initialize(numPartitions);

     while (numPartitions-- > 0) {

       final int partitionId = input.readInt();

       ExtendedDataOutput partitionData =

           WritableUtils.readExtendedDataOutput(input, getConf());

       workerPartitions.add(partitionId, partitionData);

     }

   }

   @Override

   public void writeRequest(DataOutput output) throws IOException {

     output.writeInt(workerPartitions.getSize());

     PairList<Integer, ExtendedDataOutput>.Iterator

         iterator = workerPartitions.getIterator();

     while (iterator.hasNext()) {

       iterator.next();

       output.writeInt(iterator.getCurrentFirst());

       WritableUtils.writeExtendedDataOutput(

           iterator.getCurrentSecond(), output);

     }

   }

   @Override

   public RequestType getType() {

     return RequestType.SEND_WORKER_VERTICES_REQUEST;

   }

   @Override

   public void doRequest(ServerData<I, V, E> serverData) {

     PairList<Integer, ExtendedDataOutput>.Iterator

         iterator = workerPartitions.getIterator();

     while (iterator.hasNext()) {

       iterator.next();

       serverData.getPartitionStore()

           .addPartitionVertices(iterator.getCurrentFirst(),

               iterator.getCurrentSecond());

     }

   }

   @Override

   public int getSerializedSize() {

     // 4 for number of partitions

     int size = super.getSerializedSize() + 4;

     PairList<Integer, ExtendedDataOutput>.Iterator iterator =

         workerPartitions.getIterator();

     while (iterator.hasNext()) {

       iterator.next();

       // 4 bytes for the partition id and 4 bytes for the size

       size += 8 + iterator.getCurrentSecond().getPos();

     }

     return size;

   }

 }