lightning-core/src/main/java/org/apache/directmemory/lightning/internal/instantiator/perc/PercSerializationInstantiator.java

/*
 * 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.directmemory.lightning.internal.instantiator.perc;

import java.io.ObjectInputStream;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.directmemory.lightning.instantiator.ObjectInstantiator;
import org.apache.directmemory.lightning.internal.instantiator.ObjenesisException;

/**
 * Instantiates a class by making a call to internal Perc private methods. It is only supposed to work on Perc JVMs.
 * This instantiator will create classes in a way compatible with serialization, calling the first non-serializable
 * superclass' no-arg constructor.
 * <p/>
 * Based on code provided by Aonix but <b>doesn't work right now</b>
 * 
 * @author Henri Tremblay
 * @see org.apache.directmemory.lightning.instantiator.ObjectInstantiator
 */
public class PercSerializationInstantiator
    implements ObjectInstantiator
{

    private Object[] typeArgs;

    private final java.lang.reflect.Method newInstanceMethod;

    public PercSerializationInstantiator( Class<?> type )
    {

        // Find the first unserializable parent class
        Class<?> unserializableType = type;

        while ( Serializable.class.isAssignableFrom( unserializableType ) )
        {
            unserializableType = unserializableType.getSuperclass();
        }

        try
        {
            // Get the special Perc method to call
            Class<?> percMethodClass = Class.forName( "COM.newmonics.PercClassLoader.Method" );

            newInstanceMethod =
                ObjectInputStream.class.getDeclaredMethod( "noArgConstruct", new Class[] { Class.class, Object.class,
                    percMethodClass } );
            newInstanceMethod.setAccessible( true );

            // Create invoke params
            Class<?> percClassClass = Class.forName( "COM.newmonics.PercClassLoader.PercClass" );
            Method getPercClassMethod = percClassClass.getDeclaredMethod( "getPercClass", new Class[] { Class.class } );
            Object someObject = getPercClassMethod.invoke( null, new Object[] { unserializableType } );
            Method findMethodMethod =
                someObject.getClass().getDeclaredMethod( "findMethod", new Class[] { String.class } );
            Object percMethod = findMethodMethod.invoke( someObject, new Object[] { "<init>()V" } );

            typeArgs = new Object[] { unserializableType, type, percMethod };

        }
        catch ( ClassNotFoundException e )
        {
            throw new ObjenesisException( e );
        }
        catch ( NoSuchMethodException e )
        {
            throw new ObjenesisException( e );
        }
        catch ( InvocationTargetException e )
        {
            throw new ObjenesisException( e );
        }
        catch ( IllegalAccessException e )
        {
            throw new ObjenesisException( e );
        }
    }

    @Override
    public Object newInstance()
    {
        try
        {
            return newInstanceMethod.invoke( null, typeArgs );
        }
        catch ( IllegalAccessException e )
        {
            throw new ObjenesisException( e );
        }
        catch ( InvocationTargetException e )
        {
            throw new ObjenesisException( e );
        }
    }
}