001/*
002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.webengine.loader;
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
029import groovy.lang.GroovyClassLoader;
030
031/**
032 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
033 */
034public class GroovyClassProxy implements ClassProxy {
035
036    private static final Log log = LogFactory.getLog(GroovyClassLoader.class);
037
038    protected final GroovyClassLoader loader;
039
040    protected final String className;
041
042    protected long timestamp = 0;
043
044    public GroovyClassProxy(GroovyClassLoader loader, String className) {
045        this.loader = loader;
046        this.className = className;
047    }
048
049    public String getClassName() {
050        return className;
051    }
052
053    public Class<?> get() {
054        try {
055            Class<?> clazz = loader.loadClass(className, true, false);
056            long tm = Verifier.getTimestamp(clazz);
057            if (timestamp > 0 && timestamp < tm) {
058                if (log.isDebugEnabled()) {
059                    log.debug("CLASS CHANGED: " + clazz.getName());
060                }
061            }
062            timestamp = tm;
063            return clazz;
064        } catch (ReflectiveOperationException e) {
065            throw WebException.wrap(e);
066        }
067    }
068
069    @Override
070    public String toString() {
071        return className;
072    }
073
074}