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.adapters;
022
023 import java.util.concurrent.ConcurrentHashMap;
024
025 import org.granite.gravity.AsyncPublishedMessage;
026 import org.granite.gravity.Channel;
027 import org.granite.gravity.MessagePublishingException;
028 import org.granite.logging.Logger;
029 import org.granite.messaging.service.ServiceException;
030 import org.granite.util.XMap;
031
032 import flex.messaging.messages.AcknowledgeMessage;
033 import flex.messaging.messages.AsyncMessage;
034 import flex.messaging.messages.CommandMessage;
035 import flex.messaging.messages.ErrorMessage;
036
037 /**
038 * @author William DRAI
039 */
040 public class SimpleServiceAdapter extends ServiceAdapter {
041
042 private static final Logger log = Logger.getLogger(SimpleServiceAdapter.class);
043
044 private final Topic rootTopic = new Topic("/", this);
045 private transient ConcurrentHashMap<String, TopicId> _topicIdCache;
046
047 private boolean noLocal = false;
048
049 @Override
050 public void configure(XMap adapterProperties, XMap destinationProperties) throws ServiceException {
051 super.configure(adapterProperties, destinationProperties);
052
053 _topicIdCache = new ConcurrentHashMap<String, TopicId>();
054
055 if (Boolean.TRUE.toString().equals(destinationProperties.get("no-local")))
056 noLocal = true;
057 }
058
059
060 public Topic getTopic(TopicId id) {
061 return rootTopic.getChild(id);
062 }
063
064 public Topic getTopic(String id) {
065 TopicId cid = getTopicId(id);
066 if (cid.depth() == 0)
067 return null;
068 return rootTopic.getChild(cid);
069 }
070
071 public Topic getTopic(String id, boolean create) {
072 synchronized (this) {
073 Topic topic = getTopic(id);
074
075 if (topic == null && create) {
076 topic = new Topic(id, this);
077 rootTopic.addChild(topic);
078 log.debug("New Topic: %s", topic);
079 }
080 return topic;
081 }
082 }
083
084 public TopicId getTopicId(String id) {
085 TopicId tid = _topicIdCache.get(id);
086 if (tid == null) {
087 tid = new TopicId(id);
088 _topicIdCache.put(id, tid);
089 }
090 return tid;
091 }
092
093 public boolean hasTopic(String id) {
094 TopicId cid = getTopicId(id);
095 return rootTopic.getChild(cid) != null;
096 }
097
098 @Override
099 public Object invoke(Channel fromChannel, AsyncMessage message) {
100 String topicId = TopicId.normalize(((String)message.getHeader(AsyncMessage.SUBTOPIC_HEADER)));
101
102 AsyncMessage reply = null;
103
104 if (getSecurityPolicy().canPublish(fromChannel, topicId, message)) {
105 TopicId tid = getTopicId(topicId);
106
107 try {
108 fromChannel.publish(new AsyncPublishedMessage(rootTopic, tid, message));
109 reply = new AcknowledgeMessage(message);
110 reply.setMessageId(message.getMessageId());
111 }
112 catch (MessagePublishingException e) {
113 log.error(e, "Error while publishing message: %s from channel %s to topic: %s", message, fromChannel, tid);
114 reply = new ErrorMessage(message, null);
115 ((ErrorMessage)reply).setFaultString("Server.Publish.Error");
116 }
117 }
118 else {
119 log.warn("Channel %s tried to publish a message to topic %s", fromChannel, topicId);
120 reply = new ErrorMessage(message, null);
121 ((ErrorMessage)reply).setFaultString("Server.Publish.Denied");
122 }
123
124 return reply;
125 }
126
127 @Override
128 public Object manage(Channel fromChannel, CommandMessage message) {
129 AsyncMessage reply = null;
130
131 if (message.getOperation() == CommandMessage.SUBSCRIBE_OPERATION) {
132 String subscribeTopicId = TopicId.normalize(((String)message.getHeader(AsyncMessage.SUBTOPIC_HEADER)));
133
134 if (getSecurityPolicy().canSubscribe(fromChannel, subscribeTopicId, message)) {
135 Topic topic = getTopic(subscribeTopicId);
136 if (topic == null && getSecurityPolicy().canCreate(fromChannel, subscribeTopicId, message))
137 topic = getTopic(subscribeTopicId, true);
138
139 if (topic != null) {
140 String subscriptionId = (String)message.getHeader(AsyncMessage.DESTINATION_CLIENT_ID_HEADER);
141 String selector = (String)message.getHeader(CommandMessage.SELECTOR_HEADER);
142 if (subscriptionId == null)
143 log.warn("No subscriptionId for subscription message");
144 else
145 topic.subscribe(fromChannel, message.getDestination(), subscriptionId, selector, noLocal);
146
147 reply = new AcknowledgeMessage(message);
148 }
149 else {
150 reply = new ErrorMessage(message, null);
151 ((ErrorMessage)reply).setFaultString("Server.CreateTopic.Denied");
152 }
153 }
154 else {
155 reply = new ErrorMessage(message, null);
156 ((ErrorMessage)reply).setFaultString("Server.Subscribe.Denied");
157 }
158 }
159 else if (message.getOperation() == CommandMessage.UNSUBSCRIBE_OPERATION) {
160 String unsubscribeTopicId = TopicId.normalize(((String)message.getHeader(AsyncMessage.SUBTOPIC_HEADER)));
161
162 Topic topic = getTopic(unsubscribeTopicId);
163 String subscriptionId = null;
164 if (topic != null) {
165 subscriptionId = (String)message.getHeader(AsyncMessage.DESTINATION_CLIENT_ID_HEADER);
166 if (subscriptionId == null)
167 log.warn("No subscriptionId for unsubscription message");
168 else
169 topic.unsubscribe(fromChannel, subscriptionId);
170 }
171
172 reply = new AcknowledgeMessage(message);
173 reply.setHeader(AsyncMessage.DESTINATION_CLIENT_ID_HEADER, subscriptionId);
174 }
175 else {
176 reply = new ErrorMessage(message, null);
177 ((ErrorMessage)reply).setFaultString("unknown operation");
178
179 }
180
181 return reply;
182 }
183 }