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 java.util.List;
20
21 import org.apache.commons.logging.Log;
22 import org.apache.commons.logging.LogFactory;
23 import org.springframework.batch.item.ItemWriter;
24 import org.springframework.jms.core.JmsOperations;
25 import org.springframework.jms.core.JmsTemplate;
26 import org.springframework.util.Assert;
27
28 /**
29 * An {@link ItemWriter} for JMS using a {@link JmsTemplate}. The template
30 * should have a default destination, which will be used to send items in
31 * {@link #write(List)}.<br/>
32 * <br/>
33 *
34 * The implementation is thread safe after its properties are set (normal
35 * singleton behavior).
36 *
37 * @author Dave Syer
38 *
39 */
40 public class JmsItemWriter<T> implements ItemWriter<T> {
41
42 protected Log logger = LogFactory.getLog(getClass());
43
44 private JmsOperations jmsTemplate;
45
46 /**
47 * Setter for JMS template.
48 *
49 * @param jmsTemplate
50 * a {@link JmsOperations} instance
51 */
52 public void setJmsTemplate(JmsOperations jmsTemplate) {
53 this.jmsTemplate = jmsTemplate;
54 if (jmsTemplate instanceof JmsTemplate) {
55 JmsTemplate template = (JmsTemplate) jmsTemplate;
56 Assert
57 .isTrue(template.getDefaultDestination() != null
58 || template.getDefaultDestinationName() != null,
59 "JmsTemplate must have a defaultDestination or defaultDestinationName!");
60 }
61 }
62
63 /**
64 * Send the items one-by-one to the default destination of the jms template.
65 *
66 * @see org.springframework.batch.item.ItemWriter#write(java.util.List)
67 */
68 @Override
69 public void write(List<? extends T> items) throws Exception {
70
71 if (logger.isDebugEnabled()) {
72 logger.debug("Writing to JMS with " + items.size() + " items.");
73 }
74
75 for (T item : items) {
76 jmsTemplate.convertAndSend(item);
77 }
78
79 }
80
81 }