net.sf.lipermi.handler.CallProxy Maven / Gradle / Ivy

/*
 * LipeRMI - a light weight Internet approach for remote method invocation
 * Copyright (C) 2006  Felipe Santos Andrade
 * 
 * This library 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; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * For more information, see http://lipermi.sourceforge.net/license.php
 * You can also contact author through [email protected]
 */
package net.sf.lipermi.handler;

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

import net.sf.lipermi.call.RemoteInstance;

/**
 * A dynamic proxy which delegates interface
 * calls to a ConnectionHandler
 *
 * @author lipe
 * date 05/10/2006
 *
 * @see	net.sf.lipermi.handler.CallHandler
 */
public class CallProxy implements InvocationHandler {

    private final ConnectionHandler connectionHandler;

    /**
     * Create new CallProxy with a ConnectionHandler which will
     * transport invocations on this Proxy
     *
     * @param connectionHandler handler
     */
    public CallProxy(ConnectionHandler connectionHandler) {
        this.connectionHandler = connectionHandler;
    }

    /**
     * Delegates call to this proxy to it's ConnectionHandler
     *
     * @throws java.lang.Throwable any error
     */
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        return connectionHandler.remoteInvocation(proxy, method, args);
    }

    /**
     * Build a proxy to a {
     *
     * @see net.sf.lipermi.call.RemoteInstance RemoteInstance}
     * specifing how it could be reached (i.e., through a ConnectionHandler)
     *
     * @param remoteInstance remote instance
     * @param connectionHandler handler
     *
     * @return dymamic proxy for RemoteInstance
     *
     * @throws ClassNotFoundException class not found
     */
    public static Object buildProxy(RemoteInstance remoteInstance, ConnectionHandler connectionHandler)
            throws ClassNotFoundException {
        Class clazz = Class.forName(remoteInstance.getClassName());
        return Proxy.newProxyInstance(clazz.getClassLoader(), new Class[]{clazz}, new CallProxy(connectionHandler));
    }
}