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 InvalidateCacheOnContentReactionObserver extends AbstractSiteCacheObserver
037{
038    @Override
039    public boolean supports(Event event)
040    {
041        return event.getId().equals(ObservationConstants.EVENT_CONTENT_COMMENT_REACTION_CHANGED);
042    }
043    
044    @Override
045    protected Site _getSite(Event event)
046    {
047        Content content = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
048        if (content instanceof WebContent)
049        {
050            return ((WebContent) content).getSite();
051        }
052        return null;
053    }
054
055    @Override
056    protected void _internalObserve(Event event, Site site, Session liveSession) throws Exception
057    {
058        if (getLogger().isInfoEnabled())
059        {
060            getLogger().info("Reaction changed " + event + ", invalidating cache");
061        }
062        
063        Content contentTarget = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
064        
065        if (contentTarget instanceof WebContent && contentTarget instanceof JCRAmetysObject)
066        {
067            JCRAmetysObject jcrContent = (JCRAmetysObject) contentTarget;
068            Node node = jcrContent.getNode();
069            
070            // test if in live
071            if (liveSession.itemExists(node.getPath()))
072            {
073                Collection<Page> referencingPages = ((WebContent) contentTarget).getReferencingPages();
074                
075                for (Page page : referencingPages)
076                {
077                    if (page instanceof JCRAmetysObject)
078                    {
079                        if (liveSession.itemExists(((JCRAmetysObject) page).getNode().getPath()))
080                        {
081                            _cachePolicy.invalidateCacheOnContentReactionChanged(page, contentTarget);
082                        }
083                    }
084                }
085            }
086        }
087    }
088    
089}