org.apache.flink.runtime.state.JavaSerializer Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of flink-runtime_2.10 Show documentation
There is a newer version: 1.3.3
/*
 * 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.runtime.state;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.java.typeutils.runtime.DataInputViewStream;
import org.apache.flink.api.java.typeutils.runtime.DataOutputViewStream;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.util.InstantiationUtil;

import java.io.IOException;
import java.io.Serializable;

@SuppressWarnings("serial")
@Internal
final class JavaSerializer extends TypeSerializer {

	private static final long serialVersionUID = 5067491650263321234L;

	@Override
	public boolean isImmutableType() {
		return false;
	}

	@Override
	public TypeSerializer duplicate() {
		return this;
	}

	@Override
	public T createInstance() {
		return null;
	}

	@Override
	public T copy(T from) {

		try {
			return InstantiationUtil.clone(from);
		} catch (IOException | ClassNotFoundException e) {
			throw new RuntimeException("Could not copy instance of " + from + '.', e);
		}
	}

	@Override
	public T copy(T from, T reuse) {
		return copy(from);
	}

	@Override
	public int getLength() {
		return 0;
	}

	@Override
	public void serialize(T record, DataOutputView target) throws IOException {
		InstantiationUtil.serializeObject(new DataOutputViewStream(target), record);
	}

	@Override
	public T deserialize(DataInputView source) throws IOException {
		try {
			return InstantiationUtil.deserializeObject(
					new DataInputViewStream(source), Thread.currentThread().getContextClassLoader());
		} catch (ClassNotFoundException e) {
			throw new IOException("Could not deserialize object.", e);
		}
	}

	@Override
	public T deserialize(T reuse, DataInputView source) throws IOException {
		return deserialize(source);
	}

	@Override
	public void copy(DataInputView source, DataOutputView target) throws IOException {
		int size = source.readInt();
		target.writeInt(size);
		target.write(source, size);
	}

	@Override
	public boolean equals(Object obj) {
		return obj instanceof JavaSerializer;
	}

	@Override
	public boolean canEqual(Object obj) {
		return obj instanceof JavaSerializer;
	}

	@Override
	public int hashCode() {
		return getClass().hashCode();
	}
}