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.gae;
022
023 import java.util.concurrent.ConcurrentHashMap;
024
025 import org.granite.gravity.Channel;
026 import org.granite.gravity.adapters.ServiceAdapter;
027 import org.granite.logging.Logger;
028 import org.granite.messaging.service.ServiceException;
029 import org.granite.util.XMap;
030
031 import flex.messaging.messages.AcknowledgeMessage;
032 import flex.messaging.messages.AsyncMessage;
033 import flex.messaging.messages.CommandMessage;
034 import flex.messaging.messages.ErrorMessage;
035
036 /**
037 * @author William DRAI
038 */
039 public class GAEServiceAdapter extends ServiceAdapter {
040
041 private static final Logger log = Logger.getLogger(GAEServiceAdapter.class);
042
043 private final GAETopic rootTopic = new GAETopic("/", this);
044 private transient ConcurrentHashMap<String, GAETopicId> _topicIdCache;
045
046 private boolean noLocal = false;
047
048
049 @Override
050 public void configure(XMap adapterProperties, XMap destinationProperties) throws ServiceException {
051 _topicIdCache = new ConcurrentHashMap<String, GAETopicId>();
052
053 if (Boolean.TRUE.toString().equals(destinationProperties.get("no-local")))
054 noLocal = true;
055 }
056
057
058 public GAETopic getTopic(GAETopicId id) {
059 return rootTopic.getChild(id);
060 }
061
062 public GAETopic getTopic(String id) {
063 GAETopicId cid = getTopicId(id);
064 if (cid.depth() == 0)
065 return null;
066 return rootTopic.getChild(cid);
067 }
068
069 public GAETopic getTopic(String id, boolean create) {
070 synchronized (this) {
071 GAETopic topic = getTopic(id);
072
073 if (topic == null && create) {
074 topic = new GAETopic(id, this);
075 rootTopic.addChild(topic);
076 log.debug("New Topic: %s", topic);
077 }
078 return topic;
079 }
080 }
081
082 public GAETopicId getTopicId(String id) {
083 GAETopicId tid = _topicIdCache.get(id);
084 if (tid == null) {
085 tid = new GAETopicId(id);
086 _topicIdCache.put(id, tid);
087 }
088 return tid;
089 }
090
091 public boolean hasTopic(String id) {
092 GAETopicId cid = getTopicId(id);
093 return rootTopic.getChild(cid) != null;
094 }
095
096 @Override
097 public Object invoke(Channel fromChannel, AsyncMessage message) {
098 String topicId = GAETopicId.normalize(((String)message.getHeader(AsyncMessage.SUBTOPIC_HEADER)));
099
100 AsyncMessage reply = null;
101
102 if (message.getBody() != null && getSecurityPolicy().canPublish(fromChannel, topicId, message)) {
103 GAETopicId tid = getTopicId(topicId);
104
105 rootTopic.publish(tid, fromChannel, message);
106
107 reply = new AcknowledgeMessage(message);
108 reply.setMessageId(message.getMessageId());
109 }
110 else {
111 reply = new ErrorMessage(message, null);
112 ((ErrorMessage)reply).setFaultString("unknown channel");
113 }
114
115 return reply;
116 }
117
118 @Override
119 public Object manage(Channel fromChannel, CommandMessage message) {
120 AsyncMessage reply = null;
121
122 if (message.getOperation() == CommandMessage.SUBSCRIBE_OPERATION) {
123 String subscribeTopicId = GAETopicId.normalize(((String)message.getHeader(AsyncMessage.SUBTOPIC_HEADER)));
124
125 if (getSecurityPolicy().canSubscribe(fromChannel, subscribeTopicId, message)) {
126 GAETopic topic = getTopic(subscribeTopicId);
127 if (topic == null && getSecurityPolicy().canCreate(fromChannel, subscribeTopicId, message))
128 topic = getTopic(subscribeTopicId, true);
129
130 if (topic != null) {
131 String subscriptionId = (String)message.getHeader(AsyncMessage.DESTINATION_CLIENT_ID_HEADER);
132 String selector = (String)message.getHeader(CommandMessage.SELECTOR_HEADER);
133 topic.subscribe(fromChannel, message.getDestination(), subscriptionId, selector, noLocal);
134
135 reply = new AcknowledgeMessage(message);
136 }
137 else {
138 reply = new ErrorMessage(message, null);
139 ((ErrorMessage)reply).setFaultString("cannot create");
140 }
141 }
142 else {
143 reply = new ErrorMessage(message, null);
144 ((ErrorMessage)reply).setFaultString("cannot subscribe");
145 }
146 }
147 else if (message.getOperation() == CommandMessage.UNSUBSCRIBE_OPERATION) {
148 String unsubscribeTopicId = GAETopicId.normalize(((String)message.getHeader(AsyncMessage.SUBTOPIC_HEADER)));
149
150 GAETopic topic = getTopic(unsubscribeTopicId);
151 String subscriptionId = null;
152 if (topic != null) {
153 subscriptionId = (String)message.getHeader(AsyncMessage.DESTINATION_CLIENT_ID_HEADER);
154 topic.unsubscribe(fromChannel, subscriptionId);
155 }
156
157 reply = new AcknowledgeMessage(message);
158 reply.setHeader(AsyncMessage.DESTINATION_CLIENT_ID_HEADER, subscriptionId);
159 }
160 else {
161 reply = new ErrorMessage(message, null);
162 ((ErrorMessage)reply).setFaultString("unknown operation");
163
164 }
165
166 return reply;
167 }
168 }