/**
 * Abiquo community edition
 * cloud management application for hybrid clouds
 * Copyright (C) 2008-2010 - Abiquo Holdings S.L.
 *
 * This application is free software; you can redistribute it and/or
 * modify it under the terms of the GNU LESSER GENERAL PUBLIC
 * LICENSE as published by the Free Software Foundation under
 * version 3 of the License
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * LESSER GENERAL PUBLIC LICENSE v.3 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package com.abiquo.aimstub;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;

import com.abiquo.aimstub.Aim.Client;
import com.abiquo.aimstub.Aim.Iface;

public class TTransportProxy implements InvocationHandler
{

    protected TTransport transport;

    protected TProtocol protocol;

    protected Client client;

    protected String url;

    protected int port;

    
    public static Iface getInstance(final String url, final int port)
    {
        return (Iface) java.lang.reflect.Proxy.newProxyInstance(Thread.currentThread()
            .getContextClassLoader(), new Class[] {Iface.class}, new TTransportProxy(url, port));
    }

    protected TTransportProxy(final String url, final int port)
    {
        super();

        this.url = url;
        this.port = port;

        this.transport = new TSocket(this.url, this.port);
        this.protocol = new TBinaryProtocol(this.transport);
        this.client = new Client(this.protocol);
    }

    /**
     * Intercepts all calls to business logic and checks user session.
     * 
     * @param target The target object to invoke.
     * @param method The target method to invoke.
     * @param args The arguments of the method.
     * @throws Throwable If an exception is thrown on the target method.
     * @see BasicCommand#execute(UserSession, String[], Object[], Class)
     */
    @Override
    public Object invoke(final Object target, final Method method, final Object[] args)
        throws Throwable
    {

        Object result;

        try
        {
            transport.open();

            result = method.invoke(client, args);
        }
        catch (InvocationTargetException ex)
        {
            // Re-throw the exception thrown by the target method
            throw ex.getTargetException();
        }
        finally
        {
            if (transport.isOpen())
            {
                transport.close();
            }
        }

        return result;
    }

}