org/objectweb/proactive/core/component/representative/FunctionalInterfaceProxyImpl.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * 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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.core.component.representative;

import java.io.Serializable;
import java.lang.reflect.Field;

import org.apache.log4j.Logger;
import org.objectweb.proactive.core.ProActiveRuntimeException;
import org.objectweb.proactive.core.body.LocalBodyStore;
import org.objectweb.proactive.core.body.UniversalBody;
import org.objectweb.proactive.core.body.proxy.UniversalBodyProxy;
import org.objectweb.proactive.core.mop.MethodCall;
import org.objectweb.proactive.core.mop.Proxy;
import org.objectweb.proactive.core.util.log.Loggers;
import org.objectweb.proactive.core.util.log.ProActiveLogger;


public class FunctionalInterfaceProxyImpl implements FunctionalInterfaceProxy,
    Serializable {
    protected transient final static Logger logger = ProActiveLogger.getLogger(Loggers.COMPONENTS_REQUESTS);
    private static Field universalBodyField;
    private static Field bodyIDField;
    Proxy bodyProxyDelegatee = null;
    Proxy nonShortcutProxy = null;
    String fcItfName; // name of the functional interface

    static {
        try {
            universalBodyField = UniversalBodyProxy.class.getDeclaredField(
                    "universalBody");
            universalBodyField.setAccessible(true);
            bodyIDField = UniversalBodyProxy.class.getSuperclass()
                                                  .getDeclaredField("bodyID");
            bodyIDField.setAccessible(true);
        } catch (NoSuchFieldException e) {
            logger.error(e.getMessage());
        }
    }

    private FunctionalInterfaceProxyImpl() {
    }

    public FunctionalInterfaceProxyImpl(Proxy bodyProxyDelegatee,
        String fcItfName) {
        nonShortcutProxy = this.bodyProxyDelegatee = bodyProxyDelegatee;
        this.fcItfName = fcItfName;
    }

    private void changeRefOnBody(UniversalBody body) {
        try {
            if (logger.isDebugEnabled()) {
                logger.debug("changing reference on body");
            }
            UniversalBodyProxy proxy = (UniversalBodyProxy) UniversalBodyProxy.class.newInstance();
            universalBodyField.set(proxy, body);
            bodyIDField.set(proxy, body.getID());
            bodyProxyDelegatee = proxy;
        } catch (InstantiationException e) {
            throw new ProActiveRuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new ProActiveRuntimeException(e);
        }
    }

    public Object reify(MethodCall c) throws Throwable {
        // check shortcut by asking source body (LocalBodyStore.currentThreadBody)
        // if shortcut : change ref on Body
        UniversalBody newDestinationBody = LocalBodyStore.getInstance()
                                                         .getCurrentThreadBody()
                                                         .getShortcutTargetBody(new ItfID(
                    c.getComponentMetadata().getComponentInterfaceName(),
                    ((UniversalBodyProxy) bodyProxyDelegatee).getBody().getID()));
        if (newDestinationBody != null) {
            changeRefOnBody(newDestinationBody);
        }
        return bodyProxyDelegatee.reify(c);
    }

    public void setBodyProxy(Proxy proxy) {
        bodyProxyDelegatee = proxy;
    }

    public Proxy getBodyProxy() {
        return bodyProxyDelegatee;
    }

 
}

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