1 /***
2 *
3 * Copyright 2005 LogicBlaze, Inc.
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.jencks;
19
20 import org.springframework.aop.TargetSource;
21 import org.springframework.beans.factory.InitializingBean;
22
23 import javax.jms.Message;
24 import javax.jms.MessageListener;
25
26 /***
27 * Represents a pool of MessageListener instances using Spring's
28 * TargetSource for the underlying pool.
29 *
30 * @version $Revision: 1.1.1.1 $
31 */
32 public class TargetSourceMessageListener implements MessageListener, InitializingBean {
33 private TargetSource targetSource;
34
35 public void onMessage(Message message) {
36 MessageListener delegate = null;
37 try {
38 delegate = (MessageListener) targetSource.getTarget();
39 }
40 catch (Exception e) {
41 handleException(e);
42 }
43 try {
44 delegate.onMessage(message);
45 }
46 finally {
47 try {
48 targetSource.releaseTarget(delegate);
49 }
50 catch (Exception e) {
51 handleException(e);
52 }
53 }
54 }
55
56 public void afterPropertiesSet() throws Exception {
57 if (targetSource == null) {
58 throw new IllegalArgumentException("targetSource must be set");
59 }
60 }
61
62 public TargetSource getTargetSource() {
63 return targetSource;
64 }
65
66 public void setTargetSource(TargetSource targetSource) {
67 this.targetSource = targetSource;
68 }
69
70 protected void handleException(Exception e) {
71 throw new RuntimeException(e);
72 }
73
74 }