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 javax.jcr.Session;
019
020import org.ametys.cms.ObservationConstants;
021import org.ametys.cms.repository.Content;
022import org.ametys.core.observation.Event;
023import org.ametys.core.observation.Observer;
024import org.ametys.web.repository.content.WebContent;
025import org.ametys.web.repository.site.Site;
026
027/**
028 * {@link Observer} for observing content deletion in order to 
029 * invalidate cache on front-office.
030 */
031public class InvalidateCacheOnContentUnpublishObserver extends AbstractSiteCacheObserver
032{
033    @Override
034    public boolean supports(Event event)
035    {
036        return event.getId().equals(org.ametys.web.ObservationConstants.EVENT_CONTENT_UNPUBLISHED);
037    }
038    
039    @Override
040    protected Site _getSite(Event event)
041    {
042        Content content = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
043        
044        if (content instanceof WebContent)
045        {
046            return ((WebContent) content).getSite();
047        }
048        else
049        {
050            return null;
051        }
052    }
053
054    @Override
055    protected void _internalObserve(Event event, Site site, Session liveSession) throws Exception
056    {
057        if (getLogger().isInfoEnabled())
058        {
059            getLogger().info("Content unpublish: " + event + ", invalidating cache");
060        }
061        
062        Content content = (Content) event.getArguments().get(ObservationConstants.ARGS_CONTENT);
063        
064        _cachePolicy.invalidateCacheOnContentDeletion(site, content.getId()); 
065    }
066}