001/*
002 *  Copyright 2012 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.web.cache.zoneitem;
017
018import java.util.Map;
019
020import javax.jcr.Node;
021import javax.jcr.PropertyIterator;
022import javax.jcr.RepositoryException;
023
024import org.apache.avalon.framework.service.ServiceException;
025import org.apache.avalon.framework.service.ServiceManager;
026
027import org.ametys.cms.ObservationConstants;
028import org.ametys.cms.repository.Content;
029import org.ametys.core.observation.Event;
030import org.ametys.plugins.repository.AmetysObject;
031import org.ametys.plugins.repository.AmetysObjectResolver;
032import org.ametys.plugins.repository.jcr.JCRAmetysObject;
033import org.ametys.web.repository.content.WebContent;
034import org.ametys.web.repository.page.ZoneItem;
035
036/**
037 * Invalidates the ZoneItem containing a Content which has just been modified.
038 */
039public class InvalidateZoneItemCacheOnContentModificationObserver extends AbstractZoneItemCacheObserver
040{
041    private AmetysObjectResolver _resolver;
042    
043    @Override
044    public void service(ServiceManager manager) throws ServiceException
045    {
046        super.service(manager);
047        _resolver = (AmetysObjectResolver) manager.lookup(AmetysObjectResolver.ROLE);
048    }
049    
050    @Override
051    public boolean supports(Event event)
052    {
053        return event.getId().equals(ObservationConstants.EVENT_CONTENT_MODIFIED);
054    }
055
056    @Override
057    public void observe(Event event, Map<String, Object> transientVars) throws Exception
058    {
059        Content content = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
060        
061        if (content instanceof JCRAmetysObject && content instanceof WebContent)
062        {
063            try
064            {
065                String site = ((WebContent) content).getSiteName();
066                        
067                PropertyIterator it = ((JCRAmetysObject) content).getNode().getReferences();
068                while (it.hasNext())
069                {
070                    Node refererNode = it.nextProperty().getParent();
071                    
072                    AmetysObject ao = _resolver.resolve(refererNode, true);
073                    
074                    if (ao != null && ao instanceof ZoneItem)
075                    {
076                        _zoneItemCache.removeItem("default", site, "CONTENT", ao.getId());
077                    }
078                }
079            }
080            catch (RepositoryException e)
081            {
082                getLogger().error("Unable to get referencing ZoneItems for content '" + content.getId() + "' while processing event " + event, e);
083            }
084        }
085        
086    }
087    
088}