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.tomcat;
022
023 import java.io.IOException;
024 import java.io.InputStream;
025
026 import javax.servlet.ServletException;
027 import javax.servlet.http.HttpServletRequest;
028 import javax.servlet.http.HttpServletResponse;
029
030 import org.apache.catalina.CometEvent;
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.Message;
037
038 /**
039 * @author Franck WOLFF
040 */
041 public class GravityTomcatServlet extends AbstractCometProcessor {
042
043 private static final long serialVersionUID = 1L;
044
045 private static final Logger log = Logger.getLogger(GravityTomcatServlet.class);
046
047
048 @Override
049 public CometIO createCometIO() {
050 return new ByteArrayCometIO();
051 }
052
053 @Override
054 public boolean handleRequest(CometEvent event, InputStream content) throws IOException, ServletException {
055
056 Gravity gravity = GravityManager.getGravity(getServletContext());
057 TomcatChannelFactory channelFactory = new TomcatChannelFactory(gravity);
058
059 HttpServletRequest request = event.getHttpServletRequest();
060 HttpServletResponse response = event.getHttpServletResponse();
061
062 try {
063 initializeRequest(gravity, request, response);
064
065 Message[] amf3Requests = deserialize(gravity, request, content);
066
067 log.debug(">> [AMF3 REQUESTS] %s", (Object)amf3Requests);
068
069 Message[] amf3Responses = null;
070
071 boolean accessed = false;
072 for (int i = 0; i < amf3Requests.length; i++) {
073 Message amf3Request = amf3Requests[i];
074
075 // Ask gravity to create a specific response (will be null for connect request from tunnel).
076 Message amf3Response = gravity.handleMessage(channelFactory, amf3Request);
077 String channelId = (String)amf3Request.getClientId();
078
079 // Mark current channel (if any) as accessed.
080 if (!accessed)
081 accessed = gravity.access(channelId);
082
083 // (Re)Connect message from tunnel...
084 if (amf3Response == null) {
085 if (amf3Requests.length > 1)
086 throw new IllegalArgumentException("Only one connect request is allowed on tunnel.");
087
088 TomcatChannel channel = gravity.getChannel(channelFactory, channelId);
089 if (channel == null)
090 throw new NullPointerException("No channel on tunnel connect");
091
092 // Try to send pending messages if any (using current container thread).
093 if (channel.runReceived(new AsyncHttpContext(request, response, amf3Request)))
094 return true; // Some messages have been delivered, close http event.
095
096 // No pending messages, wait for new ones or timeout (do not close http event).
097 setConnectMessage(request, amf3Request);
098 channel.setCometEvent(event);
099 return false;
100 }
101
102 if (amf3Responses == null)
103 amf3Responses = new Message[amf3Requests.length];
104 amf3Responses[i] = amf3Response;
105 }
106
107 log.debug("<< [AMF3 RESPONSES] %s", (Object)amf3Responses);
108
109 serialize(gravity, response, amf3Responses);
110 }
111 catch (IOException e) {
112 log.error(e, "Gravity message error");
113 throw e;
114 }
115 catch (Exception e) {
116 log.error(e, "Gravity message error");
117 throw new ServletException(e);
118 }
119 finally {
120 try {
121 if (content != null)
122 content.close();
123 }
124 finally {
125 cleanupRequest(request);
126 }
127 }
128
129 return true; // Close http event.
130 }
131
132 @Override
133 public boolean handleEnd(CometEvent event) throws IOException, ServletException {
134 return true; // Close http event.
135 }
136
137 @Override
138 public boolean handleError(CometEvent event) throws IOException {
139 if (EventUtil.isErrorButNotTimeout(event))
140 log.warn("Got an error event: %s", EventUtil.toString(event));
141
142 try {
143 HttpServletRequest request = event.getHttpServletRequest();
144 Message connect = getConnectMessage(request);
145 if (connect != null) { // This should be a timeout.
146 Gravity gravity = GravityManager.getGravity(getServletContext());
147 TomcatChannelFactory channelFactory = new TomcatChannelFactory(gravity);
148
149 String channelId = (String)connect.getClientId();
150 TomcatChannel channel = gravity.getChannel(channelFactory, channelId);
151
152 // Cancel channel's execution (timeout or other errors).
153 if (channel != null)
154 channel.setCometEvent(null);
155 }
156 }
157 catch (Exception e) {
158 log.error(e, "Error while processing event: %s", EventUtil.toString(event));
159 }
160
161 return true; // Close http event.
162 }
163 }