1 /***
2 *
3 * Copyright 2004 Protique Ltd
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.codehaus.activespace.jms;
19
20 import org.codehaus.activespace.SpaceEvent;
21 import org.codehaus.activespace.SpaceListener;
22
23 import javax.jms.JMSException;
24 import javax.jms.Message;
25 import javax.jms.MessageListener;
26 import java.util.ArrayList;
27 import java.util.Iterator;
28 import java.util.List;
29
30 /***
31 * A JMS MessageListener used to invoke {@link org.codehaus.activespace.SpaceListener}
32 * objects from inside a JMS subscription
33 *
34 * @version $Revision: 1.1.1.1 $
35 */
36 public class SpaceMessageListener implements MessageListener {
37
38 private JmsSpace space;
39 private List listeners = new ArrayList();
40
41 public SpaceMessageListener(JmsSpace space) {
42 this.space = space;
43 }
44
45 public void onMessage(Message message) {
46 try {
47 Object value = space.getMarshaller().unmarshall(message);
48 SpaceEvent event = new JmsSpaceEvent(space, value, message);
49 for (Iterator iter = listeners.iterator(); iter.hasNext();) {
50 SpaceListener listener = (SpaceListener) iter.next();
51 listener.onEvent(event);
52 }
53 }
54 catch (JMSException e) {
55 throw new RuntimeException(e);
56 }
57 }
58
59 public void addSpaceListener(SpaceListener listener) {
60 listeners.add(listener);
61 }
62
63 public void removeSpaceListener(SpaceListener listener) {
64 listeners.remove(listener);
65 }
66
67 public boolean isEmpty() {
68 return listeners.isEmpty();
69 }
70 }