001    /**
002     *   GRANITE DATA SERVICES
003     *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004     *
005     *   This file is part of the Granite Data Services Platform.
006     *
007     *   Granite Data Services is free software; you can redistribute it and/or
008     *   modify it under the terms of the GNU Lesser General Public
009     *   License as published by the Free Software Foundation; either
010     *   version 2.1 of the License, or (at your option) any later version.
011     *
012     *   Granite Data Services is distributed in the hope that it will be useful,
013     *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014     *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015     *   General Public License for more details.
016     *
017     *   You should have received a copy of the GNU Lesser General Public
018     *   License along with this library; if not, write to the Free Software
019     *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020     *   USA, or see <http://www.gnu.org/licenses/>.
021     */
022    package org.granite.clustering;
023    
024    import javax.servlet.http.HttpSession;
025    
026    import org.granite.context.GraniteContext;
027    import org.granite.logging.Logger;
028    import org.granite.messaging.webapp.ServletGraniteContext;
029    
030    /**
031     * @author Franck WOLFF
032     */
033    public class SessionDistributedDataFactory implements DistributedDataFactory {
034    
035            private static final Logger log = Logger.getLogger(SessionDistributedDataFactory.class);
036            
037    
038            public DistributedData getInstance() {
039                    HttpSession session = null;
040                    GraniteContext context = GraniteContext.getCurrentInstance();
041                    if (context instanceof ServletGraniteContext)
042                            session = ((ServletGraniteContext)context).getSession(false);
043                    
044                    if (session == null) {
045                            log.debug("Could not get distributed data, no session or session expired");
046                            return null;
047                    }
048                    
049                    return new SessionDistributedData(session);
050            }
051    }