com.twitter.chill.java.UnmodifiableJavaCollectionSerializer Maven / Gradle / Ivy
/*
* Copyright 2016 Alex Chermenin
*
* Licensed 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 com.twitter.chill.java;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Collections;
/**
* A kryo base {@link Serializer} for unmodifiable Java collections.
*
* Note: This serializer does not support cyclic references, so if one of the objects
* gets set the list as attribute this might cause an error during deserialization.
*
*
* @author Alex Chermenin
*/
abstract class UnmodifiableJavaCollectionSerializer extends Serializer {
abstract protected T newInstance(T o);
abstract protected Field getInnerField() throws Exception;
final private Field innerField;
UnmodifiableJavaCollectionSerializer() {
try {
innerField = getInnerField();
innerField.setAccessible(true);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
@SuppressWarnings("unchecked")
public T read(Kryo kryo, Input input, Class type) {
try {
T u = (T) kryo.readClassAndObject(input);
return newInstance(u);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
@SuppressWarnings("unchecked")
public void write(Kryo kryo, Output output, T object) {
try {
T u = (T) innerField.get(object);
kryo.writeClassAndObject(output, u);
} catch (RuntimeException e) {
// Don't eat and wrap RuntimeExceptions because the ObjectBuffer.write...
// handles SerializationException specifically (resizing the buffer)...
throw e;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}