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;
028import org.ametys.web.repository.page.ZoneItem;
029
030/**
031 * {@link Observer} for observing service modification or deletion in order to 
032 * invalidate cache for tag cloud
033 */
034public class InvalidTagCloudCacheOnServiceModification extends AbstractCacheObserver implements Serviceable
035{
036    
037    private TagCloudCacheManager _cacheManager;
038    
039    @Override
040    public void service(ServiceManager smanager) throws ServiceException
041    {
042        _cacheManager = (TagCloudCacheManager) smanager.lookup(TagCloudCacheManager.ROLE);
043    }
044
045    @Override
046    public boolean supports(Event event)
047    {
048        return event.getId().equals(ObservationConstants.EVENT_SERVICE_MODIFIED)
049            || event.getId().equals(ObservationConstants.EVENT_ZONEITEM_DELETED)
050            || event.getId().equals(ObservationConstants.EVENT_ZONEITEM_MODIFIED);
051    }
052    
053    @Override
054    public void observe(Event event, Map<String, Object> transientVars) throws Exception
055    {
056        String zoneItemId = null;
057        
058        if (event.getArguments().containsKey(ObservationConstants.ARGS_ZONE_ITEM))
059        {
060            // In case of EVENT_SERVICE_MODIFIED
061            zoneItemId = ((ZoneItem) event.getArguments().get(ObservationConstants.ARGS_ZONE_ITEM)).getId();
062        }
063        else
064        {
065            // In case of EVENT_ZONEITEM_DELETED
066            zoneItemId = (String) event.getArguments().get(ObservationConstants.ARGS_ZONE_ITEM_ID);
067        }
068        
069        // Invalidate cache for zone item
070        _cacheManager.invalidateTagCloud(zoneItemId);
071    }
072    
073}