001    /*
002      GRANITE DATA SERVICES
003      Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004    
005      This file is part of Granite Data Services.
006    
007      Granite Data Services is free software; you can redistribute it and/or modify
008      it under the terms of the GNU Library General Public License as published by
009      the Free Software Foundation; either version 2 of the License, or (at your
010      option) any later version.
011    
012      Granite Data Services is distributed in the hope that it will be useful, but
013      WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014      FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015      for more details.
016    
017      You should have received a copy of the GNU Library General Public License
018      along with this library; if not, see <http://www.gnu.org/licenses/>.
019    */
020    
021    package org.granite.clustering;
022    
023    import javax.servlet.http.HttpSession;
024    
025    import org.granite.context.GraniteContext;
026    import org.granite.logging.Logger;
027    import org.granite.messaging.webapp.ServletGraniteContext;
028    
029    /**
030     * @author Franck WOLFF
031     */
032    public class SessionDistributedDataFactory implements DistributedDataFactory {
033    
034            private static final Logger log = Logger.getLogger(SessionDistributedDataFactory.class);
035            
036    
037            public DistributedData getInstance() {
038                    HttpSession session = null;
039                    GraniteContext context = GraniteContext.getCurrentInstance();
040                    if (context instanceof ServletGraniteContext)
041                            session = ((ServletGraniteContext)context).getSession(false);
042                    
043                    if (session == null) {
044                            log.debug("Could not get distributed data, no session or session expired");
045                            return null;
046                    }
047                    
048                    return new SessionDistributedData(session);
049            }
050    }