| /* |
| * 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.cocoon.acting; |
| |
| import java.util.Map; |
| |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| |
| import org.apache.cocoon.caching.Cache; |
| import org.apache.cocoon.caching.impl.EventAwareCacheImpl; |
| import org.apache.cocoon.caching.validity.NamedEvent; |
| import org.apache.cocoon.environment.Redirector; |
| import org.apache.cocoon.environment.SourceResolver; |
| |
| /** |
| * Simple action to cause notification of a NamedEvent to an EventAwareCacheImpl. |
| * The event name is taken from a sitemap parameter named "event". |
| * |
| * This action returns null (fails) if the configured event is null or the |
| * empty string. Otherwise, it succeeds and returns an empty Map. |
| * |
| * This is used in the Event based cache example. |
| * |
| * @author Geoff Howard (ghoward@apache.org) |
| * @version CVS $Id$ |
| */ |
| public class CacheEventAction extends ServiceableAction implements ThreadSafe { |
| |
| /** |
| * Lookup the cache and call its processEvent method. Returns an |
| * empty map to signal success. |
| */ |
| public Map act(Redirector redirector, |
| SourceResolver resolver, |
| Map objectModel, |
| String src, |
| Parameters par |
| ) throws Exception { |
| final String cacheRole = par.getParameter("cache-role", Cache.ROLE + "/EventAware"); |
| Cache cache = (Cache)this.manager.lookup(cacheRole); |
| try { |
| // FIXME - This cast might not work with every container! |
| if (cache instanceof EventAwareCacheImpl) { |
| String eventName = par.getParameter("event"); |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Configured for cache event named: " + eventName); |
| } |
| if (eventName == null || "".equals(eventName)) { |
| return null; |
| } |
| ((EventAwareCacheImpl)cache).processEvent( |
| new NamedEvent(eventName)); |
| } |
| } finally { |
| this.manager.release(cache); |
| } |
| return EMPTY_MAP; |
| } |
| } |