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 import java.lang.reflect.Method;
025 import java.util.concurrent.atomic.AtomicReference;
026
027 import javax.servlet.ServletConfig;
028
029 import org.granite.gravity.AbstractChannel;
030 import org.granite.gravity.AsyncHttpContext;
031 import org.granite.gravity.GravityConfig;
032 import org.granite.logging.Logger;
033
034 import weblogic.servlet.http.AbstractAsyncServlet;
035 import weblogic.servlet.http.RequestResponseKey;
036
037 /**
038 * @author Franck WOLFF
039 */
040 public class WebLogicChannel extends AbstractChannel {
041
042 private static final Logger log = Logger.getLogger(WebLogicChannel.class);
043
044 // For WebLogic 9.1 compatibility.
045 private static Method isValid = null;
046 static {
047 try {
048 isValid = RequestResponseKey.class.getDeclaredMethod("isValid");
049 }
050 catch (Throwable t) {
051 }
052 }
053
054 private final AtomicReference<RequestResponseKey> key = new AtomicReference<RequestResponseKey>();
055
056 public WebLogicChannel(ServletConfig servletConfig, GravityConfig gravityConfig, String id) {
057 super(servletConfig, gravityConfig, id);
058 }
059
060 public void setRequestResponseKey(RequestResponseKey key) {
061 if (log.isDebugEnabled())
062 log.debug("Channel: %s got new asyncContext: %s", getId(), key);
063
064 // Set this channel's request/response key.
065 RequestResponseKey previousKey = this.key.getAndSet(key);
066
067 // Normally, we should have only two cases here:
068 //
069 // 1) this.key == null && key != null -> new (re)connect message.
070 // 2) this.key != null && key == null -> timeout.
071 //
072 // Not sure about what should be done if this.key != null && key != null, so
073 // warn about this case and close this.key if it is not the same as the key
074 // parameter.
075 if (previousKey != null) {
076 if (key != null) {
077 log.warn(
078 "Got a new non null key %s while current key %s isn't null",
079 key, this.key.get()
080 );
081 }
082 if (previousKey != key) {
083 try {
084 previousKey.getResponse().getOutputStream().close();
085 }
086 catch (Exception e) {
087 log.debug(e, "Error while closing key");
088 }
089 }
090 }
091
092 // Try to queue receiver if the new asyncContext isn't null.
093 if (key != null)
094 queueReceiver();
095 }
096
097 @Override
098 protected boolean hasAsyncHttpContext() {
099 return key.get() != null;
100 }
101
102 @Override
103 protected AsyncHttpContext acquireAsyncHttpContext() {
104 RequestResponseKey key = this.key.getAndSet(null);
105 if (key == null || !isValid(key))
106 return null;
107
108 try {
109 AbstractAsyncServlet.notify(key, this);
110 }
111 catch (IOException e) {
112 throw new RuntimeException(e);
113 }
114
115 return null;
116 }
117
118 @Override
119 protected void releaseAsyncHttpContext(AsyncHttpContext context) {
120 // This method shouldn't be called in a WebLogic environment, anyway...
121 try {
122 if (context != null)
123 context.getResponse().getOutputStream().close();
124 }
125 catch (Exception e) {
126 log.warn(e, "Could not release asyncHttpContext for channel: %s", this);
127 }
128 }
129
130 @Override
131 public void destroy() {
132 try {
133 super.destroy();
134 }
135 finally {
136 RequestResponseKey key = this.key.getAndSet(null);
137 if (key != null) {
138 try {
139 key.getResponse().getOutputStream().close();
140 }
141 catch (Exception e) {
142 log.debug(e, "Could not close key: %s for channel: %s", key, this);
143 }
144 }
145 }
146 }
147
148 private static boolean isValid(RequestResponseKey key) {
149 if (isValid != null) try {
150 return (Boolean)isValid.invoke(key);
151 }
152 catch (Exception e) {
153 return false;
154 }
155 return true;
156 }
157 }