| /* |
| * 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 com.opensymphony.xwork2.util.classloader; |
| |
| import com.opensymphony.xwork2.ActionContext; |
| import com.opensymphony.xwork2.FileManager; |
| import com.opensymphony.xwork2.FileManagerFactory; |
| import org.apache.commons.lang3.ObjectUtils; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.struts2.StrutsException; |
| |
| import java.io.File; |
| import java.io.InputStream; |
| import java.net.URISyntaxException; |
| import java.net.URL; |
| import java.util.Collections; |
| import java.util.Set; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * <p> |
| * The ReloadingClassLoader uses a delegation mechanism to allow |
| * classes to be reloaded. That means that loadClass calls may |
| * return different results if the class was changed in the underlying |
| * ResourceStore. |
| * </p> |
| * |
| * <p> |
| * class taken from Apache JCI |
| * </p> |
| */ |
| public class ReloadingClassLoader extends ClassLoader { |
| private static final Logger LOG = LogManager.getLogger(ReloadingClassLoader.class); |
| private final ClassLoader parent; |
| private ResourceStore[] stores; |
| private ClassLoader delegate; |
| |
| private Set<Pattern> acceptClasses = Collections.emptySet(); |
| |
| public ReloadingClassLoader(final ClassLoader pParent) { |
| super(pParent); |
| parent = pParent; |
| URL parentRoot = pParent.getResource(""); |
| FileManager fileManager = ActionContext.getContext().getInstance(FileManagerFactory.class).getFileManager(); |
| URL root = fileManager.normalizeToFileProtocol(parentRoot); |
| root = ObjectUtils.defaultIfNull(root, parentRoot); |
| try { |
| if (root != null) { |
| stores = new ResourceStore[]{new FileResourceStore(new File(root.toURI()))}; |
| } else { |
| throw new StrutsException("Unable to start the reloadable class loader, consider setting 'struts.convention.classes.reload' to false"); |
| } |
| } catch (URISyntaxException e) { |
| throw new StrutsException("Unable to start the reloadable class loader, consider setting 'struts.convention.classes.reload' to false", e); |
| } catch (RuntimeException e) { |
| // see WW-3121 |
| // TODO: Fix this for a reloading mechanism to be marked as stable |
| if (root != null) { |
| LOG.error("Exception while trying to build the ResourceStore for URL [{}]", root.toString(), e); |
| } |
| else { |
| LOG.error("Exception while trying to get root resource from class loader", e); |
| } |
| LOG.error("Consider setting struts.convention.classes.reload=false"); |
| throw e; |
| } |
| |
| delegate = new ResourceStoreClassLoader(parent, stores); |
| } |
| |
| public boolean addResourceStore(final ResourceStore pStore) { |
| try { |
| final int n = stores.length; |
| final ResourceStore[] newStores = new ResourceStore[n + 1]; |
| System.arraycopy(stores, 0, newStores, 1, n); |
| newStores[0] = pStore; |
| stores = newStores; |
| delegate = new ResourceStoreClassLoader(parent, stores); |
| return true; |
| } catch (final RuntimeException e) { |
| LOG.error("Could not add resource store", e); |
| } |
| return false; |
| } |
| |
| public boolean removeResourceStore(final ResourceStore pStore) { |
| |
| final int n = stores.length; |
| int i = 0; |
| |
| // FIXME: this should be improved with a Map |
| // find the pStore and index position with var i |
| while ((i < n) && (stores[i] != pStore)) { |
| i++; |
| } |
| |
| // pStore was not found |
| if (i == n) { |
| return false; |
| } |
| |
| // if stores length > 1 then array copy old values, else create new empty store |
| final ResourceStore[] newStores = new ResourceStore[n - 1]; |
| if (i > 0) { |
| System.arraycopy(stores, 0, newStores, 0, i); |
| } |
| if (i < n - 1) { |
| System.arraycopy(stores, i + 1, newStores, i, (n - i - 1)); |
| } |
| |
| stores = newStores; |
| delegate = new ResourceStoreClassLoader(parent, stores); |
| return true; |
| } |
| |
| public void reload() { |
| LOG.trace("Reloading class loader"); |
| delegate = new ResourceStoreClassLoader(parent, stores); |
| } |
| |
| public void clearAssertionStatus() { |
| delegate.clearAssertionStatus(); |
| } |
| |
| public URL getResource(String name) { |
| return delegate.getResource(name); |
| } |
| |
| public InputStream getResourceAsStream(String name) { |
| return delegate.getResourceAsStream(name); |
| } |
| |
| public Class loadClass(String name) throws ClassNotFoundException { |
| return isAccepted(name) ? delegate.loadClass(name) : parent.loadClass(name); |
| } |
| |
| public void setClassAssertionStatus(String className, boolean enabled) { |
| delegate.setClassAssertionStatus(className, enabled); |
| } |
| |
| public void setDefaultAssertionStatus(boolean enabled) { |
| delegate.setDefaultAssertionStatus(enabled); |
| } |
| |
| public void setPackageAssertionStatus(String packageName, boolean enabled) { |
| delegate.setPackageAssertionStatus(packageName, enabled); |
| } |
| |
| public void setAccepClasses(Set<Pattern> acceptClasses) { |
| this.acceptClasses = acceptClasses; |
| } |
| |
| protected boolean isAccepted(String className) { |
| if (!this.acceptClasses.isEmpty()) { |
| for (Pattern pattern : acceptClasses) { |
| Matcher matcher = pattern.matcher(className); |
| if (matcher.matches()) { |
| return true; |
| } |
| } |
| return false; |
| } else |
| return true; |
| } |
| } |
| |