/*
    * 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.writable.kryo;
  
  import java.io.DataInput;
  import java.io.DataOutput;
  import java.io.IOException;
  
  import com.esotericsoftware.kryo.io.Input;
  import com.esotericsoftware.kryo.io.Output;
  import org.apache.giraph.writable.kryo.markers.KryoIgnoreWritable;
  
  /**
   * Class which you can extend to get all serialization/deserialization
   * done automagically.
   *
   * Usage of this class is similar to KryoWritable but
   * unlike KryoWritable, this class does not
   * support recursive/nested objects to provide better
   * performance.
   *
   * If the underlying stream is a kryo output stream than the read/write
   * happens with a kryo object that doesn't track references, providing
   * significantly better performance.
   *
   */
  public abstract class KryoSimpleWritable implements KryoIgnoreWritable {
    @Override
    public final void write(DataOutput out) throws IOException {
      if (out instanceof Output) {
        Output outp = (Output) out;
        HadoopKryo.writeWithKryoOutOfObject(
                HadoopKryo.getNontrackingKryo(), outp, this);
      } else {
        HadoopKryo.writeOutOfObject(out, this);
      }
    }
  
    @Override
    public final void readFields(DataInput in) throws IOException {
      if (in instanceof Input) {
        Input inp = (Input) in;
        HadoopKryo.readWithKryoIntoObject(
                HadoopKryo.getNontrackingKryo(), inp, this);
      } else {
        HadoopKryo.readIntoObject(in, this);
      }
    }
  }