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
021package org.granite.clustering;
022
023import javax.servlet.http.HttpSession;
024
025import org.granite.context.GraniteContext;
026import org.granite.logging.Logger;
027import org.granite.messaging.webapp.ServletGraniteContext;
028
029/**
030 * @author Franck WOLFF
031 */
032public 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}