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.gravity.jetty8;
023
024import java.io.IOException;
025
026import javax.servlet.ServletException;
027import javax.servlet.http.HttpServletRequest;
028import javax.servlet.http.HttpServletResponse;
029
030import org.eclipse.jetty.continuation.Continuation;
031import org.eclipse.jetty.continuation.ContinuationSupport;
032import org.eclipse.jetty.continuation.ContinuationThrowable;
033import org.granite.gravity.AbstractGravityServlet;
034import org.granite.gravity.AsyncHttpContext;
035import org.granite.gravity.Gravity;
036import org.granite.gravity.GravityManager;
037import org.granite.gravity.GravityServletUtil;
038import org.granite.logging.Logger;
039
040import flex.messaging.messages.AsyncMessage;
041import flex.messaging.messages.Message;
042
043/**
044 * @author William DRAI
045 */
046public class GravityJettyServlet extends AbstractGravityServlet {
047
048    private static final long serialVersionUID = 1L;
049
050    private static final Logger log = Logger.getLogger(GravityJettyServlet.class);
051
052
053    @Override
054    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
055        
056        log.debug("doPost: from %s:%d", request.getRemoteAddr(), request.getRemotePort());
057
058                Gravity gravity = GravityManager.getGravity(getServletContext());
059                ContinuationChannelFactory channelFactory = new ContinuationChannelFactory(gravity);
060                
061                try {
062                        // Setup context (thread local GraniteContext, etc.)
063                        initializeRequest(gravity, request, response);
064                        
065                        AsyncMessage connect = getConnectMessage(request);
066                        
067                        // Resumed request (pending messages or timeout).
068                        if (connect != null) {
069                                String channelId = (String)connect.getClientId();
070                                ContinuationChannel channel = gravity.getChannel(channelFactory, channelId);
071
072                                // Reset channel continuation instance and deliver pending messages.
073                                synchronized (channel) {
074                                        channel.close();
075                                        channel.runReceived(new AsyncHttpContext(request, response, connect));
076                                }
077                                
078                                return;
079                        }
080                        
081                        // New Request.
082                        Message[] amf3Requests = deserialize(gravity, request);
083
084            log.debug(">> [AMF3 REQUESTS] %s", (Object)amf3Requests);
085
086            Message[] amf3Responses = null;
087            
088            boolean accessed = false;
089            for (int i = 0; i < amf3Requests.length; i++) {
090                Message amf3Request = amf3Requests[i];
091                
092                // Ask gravity to create a specific response (will be null with a connect request from tunnel).
093                Message amf3Response = gravity.handleMessage(channelFactory, amf3Request);
094                String channelId = (String)amf3Request.getClientId();
095                
096                // Mark current channel (if any) as accessed.
097                if (!accessed)
098                        accessed = gravity.access(channelId);
099                
100                // (Re)Connect message from tunnel.
101                if (amf3Response == null) {
102                    if (amf3Requests.length > 1)
103                        throw new IllegalArgumentException("Only one request is allowed on tunnel.");
104
105                        ContinuationChannel channel = gravity.getChannel(channelFactory, channelId);
106                        if (channel == null)
107                                throw new NullPointerException("No channel on tunnel connect");
108                        
109                    // Try to send pending messages if any (using current container thread).
110                        if (!channel.runReceived(new AsyncHttpContext(request, response, amf3Request))) {
111                        
112                                // No pending messages, wait for new ones or timeout.
113                                synchronized (channel) {
114                                        Continuation continuation = ContinuationSupport.getContinuation(request);
115                                        continuation.setTimeout(getLongPollingTimeout());
116                                        continuation.setAttribute(GravityServletUtil.CONNECT_MESSAGE_KEY, amf3Request);
117                                        channel.setContinuation(continuation);
118                                        
119                                        // Suspend the current resquest/response processing and free the thread
120                                        continuation.suspend(response);
121                                }
122                        }
123                        
124                        return;
125                }
126
127                if (amf3Responses == null)
128                        amf3Responses = new Message[amf3Requests.length];
129                amf3Responses[i] = amf3Response;
130            }
131
132            log.debug("<< [AMF3 RESPONSES] %s", (Object)amf3Responses);
133
134            serialize(gravity, response, amf3Responses);
135                }
136        catch (ContinuationThrowable e) {
137            throw e;
138        }
139        catch (IOException e) {
140            log.error(e, "Gravity message error");
141            throw e;
142        }
143        catch (Exception e) {
144            log.error(e, "Gravity message error");
145            throw new ServletException(e);
146        }
147                finally {
148                        // Cleanup context (thread local GraniteContext, etc.)
149                        cleanupRequest(request);
150                }
151    }
152}