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 */
022package org.granite.clustering;
023
024import javax.servlet.http.HttpSession;
025
026import org.granite.context.GraniteContext;
027import org.granite.logging.Logger;
028import org.granite.messaging.webapp.ServletGraniteContext;
029
030/**
031 * @author Franck WOLFF
032 */
033public 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}