001/*
002 * (C) Copyright 2006-2008 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     bstefanescu
016 *
017 * $Id$
018 */
019
020package org.nuxeo.ecm.webengine.loader;
021
022import groovy.lang.GroovyClassLoader;
023
024import org.apache.commons.logging.Log;
025import org.apache.commons.logging.LogFactory;
026import org.codehaus.groovy.classgen.Verifier;
027import org.nuxeo.ecm.webengine.WebException;
028
029/**
030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
031 */
032public class GroovyClassProxy implements ClassProxy {
033
034    private static final Log log = LogFactory.getLog(GroovyClassLoader.class);
035
036    protected final GroovyClassLoader loader;
037
038    protected final String className;
039
040    protected long timestamp = 0;
041
042    public GroovyClassProxy(GroovyClassLoader loader, String className) {
043        this.loader = loader;
044        this.className = className;
045    }
046
047    public String getClassName() {
048        return className;
049    }
050
051    public Class<?> get() {
052        try {
053            Class<?> clazz = loader.loadClass(className, true, false);
054            long tm = Verifier.getTimestamp(clazz);
055            if (timestamp > 0 && timestamp < tm) {
056                if (log.isDebugEnabled()) {
057                    log.debug("CLASS CHANGED: " + clazz.getName());
058                }
059            }
060            timestamp = tm;
061            return clazz;
062        } catch (ReflectiveOperationException e) {
063            throw WebException.wrap(e);
064        }
065    }
066
067    @Override
068    public String toString() {
069        return className;
070    }
071
072}