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 java.io.IOException;
025
026import javax.servlet.Filter;
027import javax.servlet.FilterChain;
028import javax.servlet.FilterConfig;
029import javax.servlet.ServletException;
030import javax.servlet.ServletRequest;
031import javax.servlet.ServletResponse;
032import javax.servlet.http.HttpServletRequest;
033
034/**
035 * This filter forces the creation of an HTTP session. Only useful in cluster
036 * environments when sticky-session is enabled, in order to ensure that a client
037 * will always use the same cluster node.
038 * 
039 * @author Franck WOLFF
040 */
041public class CreateSessionFilter implements Filter {
042
043        public void init(FilterConfig config) throws ServletException {
044        }
045
046        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
047                ((HttpServletRequest)request).getSession(true);
048                chain.doFilter(request, response);
049        }
050
051        public void destroy() {
052        }
053}