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
021 package org.granite.gravity.generic;
022
023 import java.io.IOException;
024
025 import javax.servlet.ServletConfig;
026 import javax.servlet.ServletException;
027 import javax.servlet.http.HttpServletRequest;
028 import javax.servlet.http.HttpServletResponse;
029
030 import org.granite.gravity.AbstractGravityServlet;
031 import org.granite.gravity.AsyncHttpContext;
032 import org.granite.gravity.Gravity;
033 import org.granite.gravity.GravityManager;
034 import org.granite.logging.Logger;
035
036 import flex.messaging.messages.AsyncMessage;
037 import flex.messaging.messages.Message;
038
039 /**
040 * @author William DRAI
041 */
042 public class GravityGenericServlet extends AbstractGravityServlet {
043
044 private static final long serialVersionUID = 1L;
045
046 private static final Logger log = Logger.getLogger(GravityGenericServlet.class);
047
048 @Override
049 public void init(ServletConfig config) throws ServletException {
050 super.init(config, new GenericChannelFactory());
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
060 try {
061 // Setup context (thread local GraniteContext, etc.)
062 initializeRequest(gravity, request, response);
063
064 AsyncMessage connect = getConnectMessage(request);
065
066 // Resumed request (new received messages or timeout).
067 if (connect != null) {
068 try {
069 String channelId = (String)connect.getClientId();
070 GenericChannel channel = (GenericChannel)gravity.getChannel(channelId);
071 // Reset channel continuation instance and deliver pending messages.
072 synchronized (channel) {
073 channel.reset();
074 channel.runReceived(new AsyncHttpContext(request, response, connect));
075 }
076 }
077 finally {
078 removeConnectMessage(request);
079 }
080 return;
081 }
082
083 // New Request.
084 Message[] amf3Requests = deserialize(gravity, request);
085
086 log.debug(">> [AMF3 REQUESTS] %s", (Object)amf3Requests);
087
088 Message[] amf3Responses = null;
089
090 boolean accessed = false;
091 for (int i = 0; i < amf3Requests.length; i++) {
092 Message amf3Request = amf3Requests[i];
093
094 // Ask gravity to create a specific response (will be null for connect request from tunnel).
095 Message amf3Response = gravity.handleMessage(amf3Request);
096 String channelId = (String)amf3Request.getClientId();
097
098 // Mark current channel (if any) as accessed.
099 if (!accessed)
100 accessed = gravity.access(channelId);
101
102 // (Re)Connect message from tunnel.
103 if (amf3Response == null) {
104 if (amf3Requests.length > 1)
105 throw new IllegalArgumentException("Only one request is allowed on tunnel.");
106
107 GenericChannel channel = (GenericChannel)gravity.getChannel(channelId);
108 if (channel == null)
109 throw new NullPointerException("No channel on tunnel connect");
110
111 // Try to send pending messages if any (using current container thread).
112 if (!channel.runReceived(new AsyncHttpContext(request, response, amf3Request))) {
113 // No pending messages, wait for new ones or timeout.
114 setConnectMessage(request, amf3Request);
115 synchronized (channel) {
116 WaitingContinuation continuation = new WaitingContinuation(channel);
117 channel.setContinuation(continuation);
118 continuation.suspend(getLongPollingTimeout());
119 }
120 }
121
122 return;
123 }
124
125 if (amf3Responses == null)
126 amf3Responses = new Message[amf3Requests.length];
127 amf3Responses[i] = amf3Response;
128 }
129
130 log.debug("<< [AMF3 RESPONSES] %s", (Object)amf3Responses);
131
132 serialize(gravity, response, amf3Responses);
133 }
134 catch (IOException e) {
135 log.error(e, "Gravity message error");
136 throw e;
137 }
138 catch (ClassNotFoundException e) {
139 log.error(e, "Gravity message error");
140 throw new ServletException("Gravity message error", e);
141 }
142 finally {
143 // Cleanup context (thread local GraniteContext, etc.)
144 cleanupRequest(request);
145 }
146
147 removeConnectMessage(request);
148 }
149 }