com.sun.grizzly.cometd.servlet.CometdServlet Maven / Gradle / Ivy

Go to download
/*
 * 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 */
package com.sun.grizzly.cometd.servlet;

import com.sun.grizzly.cometd.BayeuxParser;
import com.sun.grizzly.cometd.CometdRequest;
import com.sun.grizzly.cometd.CometdResponse;
import com.sun.grizzly.cometd.EventRouter;
import com.sun.grizzly.cometd.EventRouterImpl;
import java.io.IOException;
import java.util.concurrent.locks.ReentrantLock;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Simple CometdChat that route Cometd Request to the EventRouter.
 *
 * @author Jeanfrancois Arcand
 * @author TAKAI, Naoto
 */
public class CometdServlet extends HttpServlet {

    /**
     * The Bayeux {@link CometHandler} implementation.
     */
    private BayeuxParser bayeuxParser;
    /**
     * The EventRouter used to route JSON message.
     */
    private EventRouter eventRouter;
      
    private ReentrantLock initializedLock = new ReentrantLock();
    
    
    public CometdServlet() {
    }


    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        ; // Nothing
    }

    @Override
    public void doPost(HttpServletRequest hreq, HttpServletResponse hres)
            throws ServletException, IOException {

        CometdRequest cometdReq = (CometdRequest) hreq.getSession().getAttribute("cometdReq");
        if (cometdReq == null) {
            cometdReq = new CometdRequest(hreq) {

                public String[] getParameterValues(String s) {
                    return request.getParameterValues(s);
                }
            };
            hreq.getSession().setAttribute("cometdReq", cometdReq);
        }

        CometdResponse cometdRes = (CometdResponse) hreq.getSession().getAttribute("cometdRes");
        if (cometdRes == null) {
            cometdRes = new CometdResponse(hres) {

                public void write(String s) throws IOException {
                    response.getWriter().write(s);
                }

                public void flush() throws IOException {
                    response.getWriter().flush();
                }

                public void setContentType(String s) {
                    response.setContentType(s);
                }
            };
            hreq.getSession().setAttribute("cometdRes", cometdRes);
        }

        initializedLock.lock();
        try {
            if (bayeuxParser == null) {
                bayeuxParser = new BayeuxParser();
                eventRouter = new EventRouterImpl(bayeuxParser);
            }
        } finally {
            initializedLock.unlock();
        }

        eventRouter.route(cometdReq, cometdRes);
    }
}