JdkProxySerializer.java

/*
 * Copyright 2010 Martin Grotzke
 *
 * 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 de.javakaffee.kryoserializers;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;

/**
 * A serializer for jdk proxies (proxies created via <code>java.lang.reflect.Proxy.newProxyInstance</code>).
 * 
 * @author <a href="mailto:martin.grotzke@javakaffee.de">Martin Grotzke</a>
 */
public class JdkProxySerializer extends Serializer<Object> {

    @Override
    public Object read(final Kryo kryo, final Input input, final Class<Object> type) {
        final InvocationHandler invocationHandler = (InvocationHandler) kryo.readClassAndObject( input );
        final Class<?>[] interfaces = kryo.readObject( input, Class[].class );
        final ClassLoader classLoader = kryo.getClassLoader();
        try {
            return Proxy.newProxyInstance( classLoader, interfaces, invocationHandler );
        } catch( final RuntimeException e ) {
            System.err.println( getClass().getName()+ ".read:\n" +
                    "Could not create proxy using classLoader " + classLoader + "," +
                    " have invocationhandler.classloader: " + invocationHandler.getClass().getClassLoader() +
                    " have contextclassloader: " + Thread.currentThread().getContextClassLoader() );
            throw e;
        }
    }

    @Override
    public void write(final Kryo kryo, final Output output, final Object obj) {
        kryo.writeClassAndObject( output, Proxy.getInvocationHandler( obj ) );
        kryo.writeObject( output, obj.getClass().getInterfaces() );
    }

    @Override
    public Object copy(final Kryo kryo, final Object original) {
        return Proxy.newProxyInstance( kryo.getClassLoader(), original.getClass().getInterfaces(),
                Proxy.getInvocationHandler(original) );
    }
}