/*

  * 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.master.MasterGlobalCommHandler;

 import org.apache.giraph.partition.PartitionStats;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.List;

 /**

  * Request for sending partition stats from workers to master

  */

 public class PartitionStatsRequest extends WritableRequest

     implements MasterRequest {

   /** Partition stats */

   private List<PartitionStats> partitionStats;

   /**

    * Constructor

    *

    * @param partitionStats Partition stats to send

    */

   public PartitionStatsRequest(Collection<PartitionStats> partitionStats) {

     this.partitionStats = new ArrayList<>(partitionStats);

   }

   /** Constructor for reflection */

   public PartitionStatsRequest() {

   }

   @Override

   public void doRequest(MasterGlobalCommHandler commHandler) {

     commHandler.receivedPartitionStats(partitionStats);

   }

   @Override

   public RequestType getType() {

     return RequestType.PARTITION_STATS_REQUEST;

   }

   @Override

   void writeRequest(DataOutput output) throws IOException {

     output.writeInt(partitionStats.size());

     for (PartitionStats partitionStat : partitionStats) {

       partitionStat.write(output);

     }

   }

   @Override

   void readFieldsRequest(DataInput input) throws IOException {

     int size = input.readInt();

     partitionStats = new ArrayList<>(size);

     for (int i = 0; i < size; i++) {

       PartitionStats newPartitionStats = new PartitionStats();

       newPartitionStats.readFields(input);

       partitionStats.add(newPartitionStats);

     }

   }

 }