/*
    * 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);
      }
    }
  }