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.weblogic;
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.gravity.GravityServletUtil;
035 import org.granite.logging.Logger;
036 import org.granite.util.ServletParams;
037
038 import weblogic.servlet.http.AbstractAsyncServlet;
039 import weblogic.servlet.http.RequestResponseKey;
040 import flex.messaging.messages.CommandMessage;
041 import flex.messaging.messages.Message;
042
043 /**
044 * Asynchronous servlet support for WebLogic 9.1+ servers.
045 * <br /><br />
046 * Usage:
047 * <pre>
048 * <servlet>
049 * <servlet-name>GravityServlet</servlet-name>
050 * <servlet-class>org.granite.gravity.weblogic.GravityWebLogicServlet</servlet-class>
051 *
052 * (optional parameter, default is 40,000 milliseconds)
053 * <init-param>
054 * <param-name>scavangeInterval</param-name>
055 * <param-value>40000</param-value>
056 * </init-param>
057 *
058 * </servlet>
059 * </pre>
060 *
061 * @author Franck WOLFF
062 */
063 public class GravityWebLogicServlet extends AbstractAsyncServlet {
064
065 private static final long serialVersionUID = 1L;
066
067 private static final Logger log = Logger.getLogger(GravityWebLogicServlet.class);
068
069 private static final String SCAVANGE_INTERVAL = "scavangeInterval";
070
071 @Override
072 public void init(ServletConfig config) throws ServletException {
073 super.init(config);
074
075 GravityServletUtil.init(config, new WebLogicChannelFactory());
076
077 int scavangeInterval = ServletParams.get(
078 config,
079 SCAVANGE_INTERVAL,
080 Integer.TYPE,
081 AbstractAsyncServlet.DEFAULT_SCAVANGE_INTERVAL
082 );
083
084 log.info("Using scavange interval of: %s", scavangeInterval);
085 AbstractAsyncServlet.setScavangeInterval(scavangeInterval);
086 }
087
088 @Override
089 protected boolean doRequest(RequestResponseKey key) throws IOException, ServletException {
090 Gravity gravity = GravityManager.getGravity(getServletContext());
091
092 HttpServletRequest request = key.getRequest();
093 HttpServletResponse response = key.getResponse();
094
095 try {
096 GravityServletUtil.initializeRequest(getServletConfig(), gravity, request, response);
097
098 Message[] amf3Requests = GravityServletUtil.deserialize(gravity, request);
099
100 log.debug(">> [AMF3 REQUESTS] %s", (Object)amf3Requests);
101
102 Message[] amf3Responses = null;
103
104 boolean accessed = false;
105 for (int i = 0; i < amf3Requests.length; i++) {
106 Message amf3Request = amf3Requests[i];
107
108 // Ask gravity to create a specific response (will be null for connect request from tunnel).
109 Message amf3Response = gravity.handleMessage(amf3Request);
110 String channelId = (String)amf3Request.getClientId();
111
112 // Mark current channel (if any) as accessed.
113 if (!accessed)
114 accessed = gravity.access(channelId);
115
116 // (Re)Connect message from tunnel...
117 if (amf3Response == null) {
118 if (amf3Requests.length > 1)
119 throw new IllegalArgumentException("Only one connect request is allowed on tunnel.");
120
121 WebLogicChannel channel = (WebLogicChannel)gravity.getChannel(channelId);
122 if (channel == null)
123 throw new NullPointerException("No channel on tunnel connect");
124
125 // Try to send pending messages if any (using current container thread).
126 if (channel.runReceived(new AsyncHttpContext(request, response, amf3Request)))
127 return false;
128
129 // No pending messages, wait for new ones or timeout.
130 GravityServletUtil.setConnectMessage(request, amf3Request);
131 key.setTimeout((int)GravityServletUtil.getLongPollingTimeout(getServletContext()));
132 channel.setRequestResponseKey(key);
133 return true;
134 }
135
136 if (amf3Responses == null)
137 amf3Responses = new Message[amf3Requests.length];
138 amf3Responses[i] = amf3Response;
139 }
140
141 log.debug("<< [AMF3 RESPONSES] %s", (Object)amf3Responses);
142
143 GravityServletUtil.serialize(gravity, response, amf3Responses);
144 }
145 catch (IOException e) {
146 log.error(e, "Gravity message error");
147 throw e;
148 }
149 catch (Exception e) {
150 log.error(e, "Gravity message error");
151 throw new ServletException(e);
152 }
153 finally {
154 GravityServletUtil.cleanupRequest(request);
155 }
156 return false;
157 }
158
159 @Override
160 protected void doResponse(RequestResponseKey key, Object context) throws IOException, ServletException {
161 WebLogicChannel channel = (WebLogicChannel)context;
162 HttpServletRequest request = key.getRequest();
163 HttpServletResponse response = key.getResponse();
164 Message requestMessage = AbstractGravityServlet.getConnectMessage(request);
165
166 channel.runReceived(new AsyncHttpContext(request, response, requestMessage));
167 }
168
169 @Override
170 protected void doTimeout(RequestResponseKey key) throws IOException, ServletException {
171 Gravity gravity = GravityManager.getGravity(getServletContext());
172 CommandMessage amf3Request = GravityServletUtil.getConnectMessage(key.getRequest());
173 String channelId = (String)amf3Request.getClientId();
174 WebLogicChannel channel = (WebLogicChannel)gravity.getChannel(channelId);
175 channel.setRequestResponseKey(null);
176 }
177 }