/*

  * 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.graph.partition;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 import org.apache.giraph.graph.BspUtils;

 import org.apache.hadoop.conf.Configurable;

 import org.apache.hadoop.conf.Configuration;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 /**

  * Hint to the {@link RangeMasterPartitioner} about how a

  * {@link RangePartitionOwner} can be split.

  *

  * @param <I> Vertex index to split around

  */

 @SuppressWarnings("rawtypes")

 public class RangeSplitHint<I extends WritableComparable>

     implements Writable, Configurable {

   /** Hinted split index */

   private I splitIndex;

   /** Number of vertices in this range before the split */

   private long preSplitVertexCount;

   /** Number of vertices in this range after the split */

   private long postSplitVertexCount;

   /** Configuration */

   private Configuration conf;

   @Override

   public void readFields(DataInput input) throws IOException {

     splitIndex = BspUtils.<I>createVertexId(conf);

     splitIndex.readFields(input);

     preSplitVertexCount = input.readLong();

     postSplitVertexCount = input.readLong();

   }

   @Override

   public void write(DataOutput output) throws IOException {

     splitIndex.write(output);

     output.writeLong(preSplitVertexCount);

     output.writeLong(postSplitVertexCount);

   }

   @Override

   public Configuration getConf() {

     return conf;

   }

   @Override

   public void setConf(Configuration conf) {

     this.conf = conf;

   }

 }