001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.runtime.instrumentation;
020
021import java.lang.instrument.ClassDefinition;
022import java.lang.instrument.Instrumentation;
023import java.lang.instrument.UnmodifiableClassException;
024
025import lucee.commons.lang.ExceptionUtil;
026
027public class InstrumentationUtil {
028
029        /**
030         * redefine the class with the given byte array
031         * @param clazz
032         * @param barr
033         * @return
034         */
035        public static boolean redefineClassEL(Class clazz, byte[] barr){
036                Instrumentation inst = InstrumentationFactory.getInstance();
037            if(inst!=null && inst.isRedefineClassesSupported()) {
038                try {
039                        inst.redefineClasses(new ClassDefinition(clazz,barr));
040                                return true;
041                        } 
042                catch (Throwable t) {
043                                ExceptionUtil.rethrowIfNecessary(t);
044                                t.printStackTrace();
045                        }
046            }
047            return false;
048        }
049
050        public static void redefineClass(Class clazz, byte[] barr) throws ClassNotFoundException, UnmodifiableClassException{
051                Instrumentation inst = InstrumentationFactory.getInstance();
052            inst.redefineClasses(new ClassDefinition(clazz,barr));
053        }
054
055        public static boolean isSupported() {
056                Instrumentation inst = InstrumentationFactory.getInstance();
057                return (inst!=null && inst.isRedefineClassesSupported());
058        } 
059}