1 /*
2 * Copyright 2006-2007 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.springframework.batch.item.jms;
18
19 import javax.jms.JMSException;
20 import javax.jms.Message;
21
22 import org.springframework.batch.item.UnexpectedInputException;
23 import org.springframework.retry.interceptor.NewMethodArgumentsIdentifier;
24
25 /**
26 * A {@link NewMethodArgumentsIdentifier} for JMS that looks for a message in
27 * the arguments and checks its delivery status.
28 *
29 * @author Dave Syer
30 *
31 */
32 public class JmsNewMethodArgumentsIdentifier<T> implements NewMethodArgumentsIdentifier {
33
34 /**
35 * If any of the arguments is a message, check the JMS re-delivered flag and
36 * return it, otherwise return false to be on the safe side.
37 *
38 * @see org.springframework.retry.interceptor.NewMethodArgumentsIdentifier#isNew(java.lang.Object[])
39 */
40 @Override
41 public boolean isNew(Object[] args) {
42
43 for (Object item : args) {
44 if (item instanceof Message) {
45 try {
46 return !((Message) item).getJMSRedelivered();
47 }
48 catch (JMSException e) {
49 throw new UnexpectedInputException("Could not extract message ID", e);
50 }
51 }
52 }
53 return false;
54 }
55
56 }