org.apache.hadoop.io.serializer.JavaSerialization Maven / Gradle / Ivy
/**
* 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.hadoop.io.serializer;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
*
* An experimental {@link Serialization} for Java {@link Serializable} classes.
*
* @see JavaSerializationComparator
*/
@InterfaceAudience.Public
@InterfaceStability.Unstable
public class JavaSerialization implements Serialization {
static class JavaSerializationDeserializer
implements Deserializer {
private ObjectInputStream ois;
@Override
public void open(InputStream in) throws IOException {
ois = new ObjectInputStream(in) {
@Override protected void readStreamHeader() {
// no header
}
};
}
@Override
@SuppressWarnings("unchecked")
public T deserialize(T object) throws IOException {
try {
// ignore passed-in object
return (T) ois.readObject();
} catch (ClassNotFoundException e) {
throw new IOException(e.toString());
}
}
@Override
public void close() throws IOException {
ois.close();
}
}
static class JavaSerializationSerializer
implements Serializer {
private ObjectOutputStream oos;
@Override
public void open(OutputStream out) throws IOException {
oos = new ObjectOutputStream(out) {
@Override protected void writeStreamHeader() {
// no header
}
};
}
@Override
public void serialize(Serializable object) throws IOException {
oos.reset(); // clear (class) back-references
oos.writeObject(object);
}
@Override
public void close() throws IOException {
oos.close();
}
}
@Override
@InterfaceAudience.Private
public boolean accept(Class c) {
return Serializable.class.isAssignableFrom(c);
}
@Override
@InterfaceAudience.Private
public Deserializer getDeserializer(Class c) {
return new JavaSerializationDeserializer();
}
@Override
@InterfaceAudience.Private
public Serializer getSerializer(Class c) {
return new JavaSerializationSerializer();
}
}