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KryoSimpleWritable xref
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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.giraph.writable.kryo;
19  
20  import java.io.DataInput;
21  import java.io.DataOutput;
22  import java.io.IOException;
23  
24  import com.esotericsoftware.kryo.io.Input;
25  import com.esotericsoftware.kryo.io.Output;
26  import org.apache.giraph.writable.kryo.markers.KryoIgnoreWritable;
27  
28  /**
29   * Class which you can extend to get all serialization/deserialization
30   * done automagically.
31   *
32   * Usage of this class is similar to KryoWritable but
33   * unlike KryoWritable, this class does not
34   * support recursive/nested objects to provide better
35   * performance.
36   *
37   * If the underlying stream is a kryo output stream than the read/write
38   * happens with a kryo object that doesn't track references, providing
39   * significantly better performance.
40   *
41   */
42  public abstract class KryoSimpleWritable implements KryoIgnoreWritable {
43    @Override
44    public final void write(DataOutput out) throws IOException {
45      if (out instanceof Output) {
46        Output outp = (Output) out;
47        HadoopKryo.writeWithKryoOutOfObject(
48                HadoopKryo.getNontrackingKryo(), outp, this);
49      } else {
50        HadoopKryo.writeOutOfObject(out, this);
51      }
52    }
53  
54    @Override
55    public final void readFields(DataInput in) throws IOException {
56      if (in instanceof Input) {
57        Input inp = (Input) in;
58        HadoopKryo.readWithKryoIntoObject(
59                HadoopKryo.getNontrackingKryo(), inp, this);
60      } else {
61        HadoopKryo.readIntoObject(in, this);
62      }
63    }
64  }