| /* |
| * 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 org.apache.lenya.ac.impl; |
| |
| import org.apache.avalon.framework.logger.AbstractLogEnabled; |
| import org.apache.avalon.framework.service.ServiceException; |
| import org.apache.avalon.framework.service.ServiceManager; |
| import org.apache.avalon.framework.service.Serviceable; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| import org.apache.excalibur.source.SourceResolver; |
| import org.apache.lenya.ac.AccessControlException; |
| import org.apache.lenya.ac.AccessController; |
| import org.apache.lenya.ac.AccessControllerResolver; |
| import org.apache.lenya.ac.cache.URLKeyUtil; |
| import org.apache.lenya.util.CacheMap; |
| |
| /** |
| * Abstract implementation for access controller resolvers. |
| * @version $Id$ |
| */ |
| public abstract class AbstractAccessControllerResolver |
| extends AbstractLogEnabled |
| implements AccessControllerResolver, Serviceable, ThreadSafe { |
| |
| protected static final int CAPACITY = 1000; |
| private CacheMap cache; |
| |
| protected CacheMap getCache() { |
| if (this.cache == null) { |
| this.cache = new CacheMap(CAPACITY, getLogger()); |
| } |
| return this.cache; |
| } |
| |
| /** |
| * @see org.apache.lenya.ac.AccessControllerResolver#resolveAccessController(java.lang.String) |
| */ |
| public AccessController resolveAccessController(String webappUrl) |
| throws AccessControlException { |
| |
| SourceResolver resolver = null; |
| AccessController controller = null; |
| Object key = null; |
| |
| try { |
| resolver = (SourceResolver) getManager().lookup(SourceResolver.ROLE); |
| key = generateCacheKey(webappUrl, resolver); |
| getLogger().debug("Access controller cache key: [" + key + "]"); |
| |
| } catch (Exception e) { |
| throw new AccessControlException(e); |
| } finally { |
| if (resolver != null) { |
| getManager().release(resolver); |
| } |
| } |
| |
| CacheMap cache = getCache(); |
| |
| synchronized (cache) { |
| controller = (AccessController) cache.get(key); |
| if (controller == null) { |
| getLogger().debug("No access controller in cache."); |
| controller = doResolveAccessController(webappUrl); |
| cache.put(key, controller); |
| } else { |
| getLogger().debug("Getting access controller from cache."); |
| } |
| } |
| |
| return controller; |
| } |
| |
| /** |
| * Generates a cache key for the access controller. |
| * @param webappUrl The webapp URL. |
| * @param resolver The source resolver. |
| * @return An object. |
| * @throws AccessControlException when something went wrong. |
| */ |
| protected Object generateCacheKey(String webappUrl, SourceResolver resolver) |
| throws AccessControlException { |
| Object key; |
| try { |
| key = URLKeyUtil.generateKey(resolver, webappUrl); |
| } catch (Exception e) { |
| throw new AccessControlException(e); |
| } |
| return key; |
| } |
| |
| /** |
| * The actual resolving method. |
| * @param webappUrl The URL within the web application. |
| * @return An access controller. |
| * @throws AccessControlException when something went wrong. |
| */ |
| protected abstract AccessController doResolveAccessController(String webappUrl) |
| throws AccessControlException; |
| |
| /** |
| * @see org.apache.lenya.ac.AccessControllerResolver#release(org.apache.lenya.ac.AccessController) |
| */ |
| public void release(AccessController controller) { |
| /* |
| if (controller != null) { |
| getManager().release(controller); |
| } |
| */ |
| } |
| |
| protected ServiceManager manager; |
| |
| /** |
| * @see org.apache.avalon.framework.service.Serviceable#service(org.apache.avalon.framework.service.ServiceManager) |
| */ |
| public void service(ServiceManager _manager) throws ServiceException { |
| getLogger().debug("Servicing [" + getClass().getName() + "]"); |
| this.manager = _manager; |
| } |
| |
| /** |
| * Returns the service manager of this Serviceable. |
| * @return A service manager. |
| */ |
| public ServiceManager getManager() { |
| return this.manager; |
| } |
| |
| } |