/*
* 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.flink.api.java.typeutils.runtime;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;
import java.io.IOException;
public class KryoSerializer<T> extends TypeSerializer<T> {
private static final long serialVersionUID = 1L;
private final Class<T> type;
private final Class<? extends T> typeToInstantiate;
private transient Kryo kryo;
private transient T copyInstance;
private transient DataOutputView previousOut;
private transient DataInputView previousIn;
private transient Input input;
private transient Output output;
public KryoSerializer(Class<T> type){
this(type,type);
}
public KryoSerializer(Class<T> type, Class<? extends T> typeToInstantiate){
if(type == null || typeToInstantiate == null){
throw new NullPointerException("Type class cannot be null.");
}
this.type = type;
this.typeToInstantiate = typeToInstantiate;
kryo = new Kryo();
kryo.setAsmEnabled(true);
kryo.register(type);
}
@Override
public boolean isImmutableType() {
return false;
}
@Override
public boolean isStateful() {
return true;
}
@Override
public T createInstance() {
checkKryoInitialized();
return kryo.newInstance(typeToInstantiate);
}
@Override
public T copy(T from) {
checkKryoInitialized();
return kryo.copy(from);
}
@Override
public T copy(T from, T reuse) {
checkKryoInitialized();
return kryo.copy(from);
}
@Override
public int getLength() {
return -1;
}
@Override
public void serialize(T record, DataOutputView target) throws IOException {
checkKryoInitialized();
if (target != previousOut) {
DataOutputViewStream outputStream = new DataOutputViewStream(target);
output = new Output(outputStream);
previousOut = target;
}
kryo.writeObject(output, record);
output.flush();
}
@Override
public T deserialize(DataInputView source) throws IOException {
checkKryoInitialized();
if (source != previousIn) {
DataInputViewStream inputStream = new DataInputViewStream(source);
input = new NoFetchingInput(inputStream);
previousIn = source;
}
return kryo.readObject(input, typeToInstantiate);
}
@Override
public T deserialize(T reuse, DataInputView source) throws IOException {
return deserialize(source);
}
@Override
public void copy(DataInputView source, DataOutputView target) throws IOException {
checkKryoInitialized();
if(this.copyInstance == null){
this.copyInstance = createInstance();
}
T tmp = deserialize(copyInstance, source);
serialize(tmp, target);
}
// --------------------------------------------------------------------------------------------
@Override
public int hashCode() {
return type.hashCode() + 31 * typeToInstantiate.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj != null && obj instanceof KryoSerializer) {
KryoSerializer<?> other = (KryoSerializer<?>) obj;
return other.type == this.type && other.typeToInstantiate == this.typeToInstantiate;
} else {
return false;
}
}
// --------------------------------------------------------------------------------------------
private void checkKryoInitialized() {
if (this.kryo == null) {
this.kryo = new Kryo();
this.kryo.setAsmEnabled(true);
this.kryo.register(type);
}
}
}