001/*
002 *  Copyright 2010 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;
017
018import java.util.Collection;
019
020import javax.jcr.Node;
021import javax.jcr.Session;
022
023import org.ametys.cms.ObservationConstants;
024import org.ametys.cms.repository.Content;
025import org.ametys.core.observation.Event;
026import org.ametys.core.observation.Observer;
027import org.ametys.plugins.repository.jcr.JCRAmetysObject;
028import org.ametys.web.repository.content.WebContent;
029import org.ametys.web.repository.page.Page;
030import org.ametys.web.repository.site.Site;
031
032/**
033 * {@link Observer} for observing content deletion in order to 
034 * invalidate cache on front-office.
035 */
036public class InvalidateCacheOnContentCommentedObserver extends AbstractSiteCacheObserver
037{
038    @Override
039    public boolean supports(Event event)
040    {
041        return event.getId().equals(ObservationConstants.EVENT_CONTENT_COMMENT_VALIDATED)
042            || event.getId().equals(ObservationConstants.EVENT_CONTENT_COMMENT_UNVALIDATED)
043            || event.getId().equals(ObservationConstants.EVENT_CONTENT_COMMENT_MODIFYING)
044            || event.getId().equals(ObservationConstants.EVENT_CONTENT_COMMENT_DELETED)
045            || event.getId().equals(ObservationConstants.EVENT_CONTENT_COMMENT_REACTION_CHANGED);
046    }
047    
048    @Override
049    protected Site _getSite(Event event)
050    {
051        Content content = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
052        if (content instanceof WebContent)
053        {
054            return ((WebContent) content).getSite();
055        }
056        return null;
057    }
058
059    @Override
060    protected void _internalObserve(Event event, Site site, Session liveSession) throws Exception
061    {
062        if (getLogger().isInfoEnabled())
063        {
064            getLogger().info("Comment validated or unvalidated: " + event + ", invalidating cache");
065        }
066        
067        Content contentTarget = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
068        
069        if (contentTarget instanceof WebContent && contentTarget instanceof JCRAmetysObject)
070        {
071            JCRAmetysObject jcrContent = (JCRAmetysObject) contentTarget;
072            Node node = jcrContent.getNode();
073            
074            // test if content exists in live
075            if (liveSession.itemExists(node.getPath()))
076            {
077                Collection<Page> referencingPages = ((WebContent) contentTarget).getReferencingPages();
078                
079                for (Page page : referencingPages)
080                {
081                    if (page instanceof JCRAmetysObject)
082                    {
083                        // test if page exists in live
084                        if (liveSession.itemExists(((JCRAmetysObject) page).getNode().getPath()))
085                        {
086                            _cachePolicy.invalidateCacheOnContentCommented(page, contentTarget);
087                        }
088                    }
089                }
090            }
091        }
092    }
093}