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.plugins.tagcloud.cache;
017
018import java.util.Map;
019
020import org.apache.avalon.framework.service.ServiceException;
021import org.apache.avalon.framework.service.ServiceManager;
022import org.apache.avalon.framework.service.Serviceable;
023
024import org.ametys.core.observation.Event;
025import org.ametys.core.observation.Observer;
026import org.ametys.web.ObservationConstants;
027import org.ametys.web.cache.AbstractCacheObserver;
028
029/**
030 * {@link Observer} for observing content tagging, deletion or validation in order to 
031 * invalidate cache for tag cloud
032 */
033public class InvalidTagCloudCacheOnSiteModification extends AbstractCacheObserver implements Serviceable
034{
035    
036    private TagCloudCacheManager _cacheManager;
037    
038    @Override
039    public void service(ServiceManager smanager) throws ServiceException
040    {
041        _cacheManager = (TagCloudCacheManager) smanager.lookup(TagCloudCacheManager.ROLE);
042    }
043    
044    @Override
045    public boolean supports(Event event)
046    {
047        return event.getId().equals(ObservationConstants.EVENT_SITE_DELETED)
048                || event.getId().equals(ObservationConstants.EVENT_SITEMAP_DELETED)
049                || event.getId().equals(ObservationConstants.EVENT_PAGE_CHANGED);
050    }
051    
052    @Override
053    public void observe(Event event, Map<String, Object> transientVars) throws Exception
054    {
055        _cacheManager.invalidateCache();
056    }
057
058}