001    /*
002     * Copyright © 2008, 2009 Pedro Agulló Soliveres.
003     * 
004     * This file is part of DirectJNgine.
005     *
006     * DirectJNgine is free software: you can redistribute it and/or modify
007     * it under the terms of the GNU Lesser General Public License as published by
008     * the Free Software Foundation, either version 3 of the License.
009     *
010     * Commercial use is permitted to the extent that the code/component(s)
011     * do NOT become part of another Open Source or Commercially developed
012     * licensed development library or toolkit without explicit permission.
013     *
014     * DirectJNgine is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017     * GNU Lesser General Public License for more details.
018     *
019     * You should have received a copy of the GNU Lesser General Public License
020     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
021     * 
022     * This software uses the ExtJs library (http://extjs.com), which is 
023     * distributed under the GPL v3 license (see http://extjs.com/license).
024     */
025    
026    package com.softwarementors.extjs.djn.servlet.ssm;
027    
028    import javax.servlet.http.HttpServlet;
029    import javax.servlet.http.HttpServletRequest;
030    import javax.servlet.http.HttpServletResponse;
031    
032    import edu.umd.cs.findbugs.annotations.NonNull;
033    
034    public class WebContextManager {
035      @NonNull private static ThreadLocal<WebContext> webContext = new ThreadLocal<WebContext>();
036      
037      public static WebContext get() {
038        assert isWebContextAttachedToCurrentThread();
039        
040        return webContext.get();
041      }
042    
043      public static void attachWebContextToCurrentThread( WebContext context ) {
044        assert context != null;
045        assert !isWebContextAttachedToCurrentThread();
046        
047        webContext.set( new WebContext(context));
048      }
049      
050      public static void detachFromCurrentThread() {
051        assert isWebContextAttachedToCurrentThread();
052        
053        WebContext context = get();
054        webContext.set(null);
055        context.close();
056      }
057      
058      public static WebContext  initializeWebContextForCurrentThread( HttpServlet servlet, HttpServletRequest request, HttpServletResponse response) {
059        assert request != null;
060        assert response != null;
061        assert servlet != null;
062        assert !isWebContextAttachedToCurrentThread();
063        
064        WebContext result = new WebContext(servlet, request, response );
065        webContext.set( result );
066        return result;
067      }
068      
069      public static boolean isWebContextAttachedToCurrentThread() {
070        WebContext context = webContext.get(); 
071        return context != null;
072      }
073      
074    }