| /* |
| * 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.livy.client.common; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.nio.ByteBuffer; |
| |
| import com.esotericsoftware.kryo.Kryo; |
| import com.esotericsoftware.kryo.io.Input; |
| import com.esotericsoftware.kryo.io.Output; |
| import com.esotericsoftware.shaded.org.objenesis.strategy.StdInstantiatorStrategy; |
| |
| import org.apache.livy.annotations.Private; |
| |
| /** |
| * Utility class to serialize user data using Kryo. |
| */ |
| @Private |
| public class Serializer { |
| |
| // Kryo docs say 0-8 are taken. Strange things happen if you don't set an ID when registering |
| // classes. |
| private static final int REG_ID_BASE = 16; |
| |
| private final ThreadLocal<Kryo> kryos; |
| |
| public Serializer(final Class<?>... klasses) { |
| this.kryos = new ThreadLocal<Kryo>() { |
| @Override |
| protected Kryo initialValue() { |
| Kryo kryo = new Kryo(); |
| int count = 0; |
| for (Class<?> klass : klasses) { |
| kryo.register(klass, REG_ID_BASE + count); |
| count++; |
| } |
| kryo.setInstantiatorStrategy(new StdInstantiatorStrategy()); |
| kryo.setClassLoader(Thread.currentThread().getContextClassLoader()); |
| return kryo; |
| } |
| }; |
| } |
| |
| public Object deserialize(ByteBuffer data) { |
| byte[] b = new byte[data.remaining()]; |
| data.get(b); |
| Input kryoIn = new Input(b); |
| return kryos.get().readClassAndObject(kryoIn); |
| } |
| |
| public ByteBuffer serialize(Object data) { |
| ByteBufferOutputStream out = new ByteBufferOutputStream(); |
| Output kryoOut = new Output(out); |
| kryos.get().writeClassAndObject(kryoOut, data); |
| kryoOut.flush(); |
| return out.getBuffer(); |
| } |
| |
| private static class ByteBufferOutputStream extends ByteArrayOutputStream { |
| |
| public ByteBuffer getBuffer() { |
| ByteBuffer result = ByteBuffer.wrap(buf, 0, count); |
| buf = null; |
| reset(); |
| return result; |
| } |
| |
| } |
| |
| } |