| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package rewrite.org.apache.myfaces.extensions.scripting.core.reloading; |
| |
| import org.apache.commons.beanutils.BeanUtils; |
| import rewrite.org.apache.myfaces.extensions.scripting.core.common.api.ReloadingStrategy; |
| import rewrite.org.apache.myfaces.extensions.scripting.core.context.WeavingContext; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * A simple implementation of our reloading strategy |
| * pattern this is the most basic implementation |
| * covering our reloading. |
| * <p/> |
| * Applicable for most artifacts except for now managed beans |
| * <p/> * |
| * |
| * @author Werner Punz (latest modification by $Author$) |
| * @version $Revision$ $Date$ |
| */ |
| |
| public class SimpleReloadingStrategy implements ReloadingStrategy |
| { |
| |
| |
| |
| public SimpleReloadingStrategy() { |
| |
| } |
| |
| /** |
| * <p> |
| * the central callback for our strategy here |
| * it has to handle the reload of the scriptingInstance |
| * if possible, otherwise it has to return the |
| * original object if no reload was necessary or possible |
| * </p> |
| * |
| * @param scriptingInstance the instance to be reloaded by the system |
| * @return either the same object or a new instance utilizing the changed code |
| */ |
| public Object reload(Object scriptingInstance, int artifactType) { |
| |
| //reload the class to get new static content if needed |
| Class aclass = WeavingContext.getInstance().reloadClass(scriptingInstance.getClass()); |
| if (aclass.hashCode() == scriptingInstance.getClass().hashCode()) { |
| //class of this object has not changed although |
| // reload is enabled we can skip the rest now |
| return scriptingInstance; |
| } |
| getLog().info("[EXT-SCRIPTING] possible reload for " + scriptingInstance.getClass().getName()); |
| /*only recreation of empty constructor classes is possible*/ |
| try { |
| //reload the object by instantiating a new class and |
| // assigning the attributes properly |
| Object newObject = aclass.newInstance(); |
| |
| /*now we shuffle the properties between the objects*/ |
| mapProperties(newObject, scriptingInstance); |
| |
| return newObject; |
| } catch (Exception e) { |
| getLog().log(Level.SEVERE, "reload ", e); |
| } |
| return null; |
| |
| } |
| |
| /** |
| * helper to map the properties wherever possible |
| * <p/> |
| * This is the simplest solution for now, |
| * we apply only a copy properties here, which should be enough |
| * for all artifacts except the managed beans and the ones |
| * which have to preserve some kind of delegate before instantiation. |
| * |
| * @param target the target which has to receive the properties |
| * @param src the source which has the original properties |
| */ |
| protected void mapProperties(Object target, Object src) { |
| try { |
| BeanUtils.copyProperties(target, src); |
| } catch (IllegalAccessException e) { |
| getLog().log(Level.FINEST, e.toString()); |
| //this is wanted |
| } catch (InvocationTargetException e) { |
| getLog().log(Level.FINEST, e.toString()); |
| //this is wanted |
| } |
| } |
| |
| protected Logger getLog() { |
| return Logger.getLogger(this.getClass().getName()); |
| } |
| |
| } |