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.Map;
019
020import javax.jcr.Node;
021import javax.jcr.Session;
022
023import org.ametys.core.observation.Event;
024import org.ametys.core.observation.Observer;
025import org.ametys.plugins.repository.jcr.JCRAmetysObject;
026import org.ametys.web.ObservationConstants;
027import org.ametys.web.repository.page.Page;
028import org.ametys.web.repository.page.ZoneItem;
029import org.ametys.web.repository.site.Site;
030
031/**
032 * {@link Observer} for observing page content changes (which do not impact other pages) in order to invalidate cache on front-office.
033 */
034public class InvalidateCacheOnPageMinorChangeObserver extends AbstractSiteCacheObserver
035{
036    
037    @Override
038    public boolean supports(Event event)
039    {
040        return event.getId().equals(ObservationConstants.EVENT_ZONEITEM_MOVED)
041            || event.getId().equals(ObservationConstants.EVENT_SERVICE_MODIFIED);
042    }
043    
044    @Override
045    protected Site _getSite(Event event)
046    {
047        return _getPage(event).getSite();
048    }
049    
050    private Page _getPage (Event event)
051    {
052        Map<String, Object> args = event.getArguments();
053        if (args.containsKey(ObservationConstants.ARGS_ZONE_ITEM))
054        {
055            ZoneItem zoneItem = (ZoneItem) args.get(ObservationConstants.ARGS_ZONE_ITEM);
056            return zoneItem.getZone().getPage();
057        }
058        else
059        {
060            return (Page) args.get(ObservationConstants.ARGS_PAGE);
061        }
062    }
063    
064    @Override
065    protected void _internalObserve(Event event, Site site, Session liveSession) throws Exception
066    {
067        Page page = _getPage (event);
068        
069        if (page instanceof JCRAmetysObject)
070        {
071            Node pageNode = ((JCRAmetysObject) page).getNode();
072            if (liveSession.itemExists(pageNode.getPath()))
073            {
074                // If the page is in the live workspace, invalidate the cache.
075                _cachePolicy.invalidateCacheOnPageMinorChange(page);
076            }
077        }
078    }
079    
080}