1 /*
2 * Copyright 2006-2013 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 package org.springframework.batch.core.listener;
17
18 import java.util.Iterator;
19 import java.util.List;
20
21 import org.springframework.batch.core.ItemReadListener;
22 import org.springframework.core.Ordered;
23
24 /**
25 * @author Lucas Ward
26 * @author Dave Syer
27 *
28 */
29 public class CompositeItemReadListener<T> implements ItemReadListener<T> {
30
31 private OrderedComposite<ItemReadListener<? super T>> listeners = new OrderedComposite<ItemReadListener<? super T>>();
32
33 /**
34 * Public setter for the listeners.
35 *
36 * @param itemReadListeners
37 */
38 public void setListeners(List<? extends ItemReadListener<? super T>> itemReadListeners) {
39 this.listeners.setItems(itemReadListeners);
40 }
41
42 /**
43 * Register additional listener.
44 *
45 * @param itemReaderListener
46 */
47 public void register(ItemReadListener<? super T> itemReaderListener) {
48 listeners.add(itemReaderListener);
49 }
50
51 /**
52 * Call the registered listeners in reverse order, respecting and
53 * prioritising those that implement {@link Ordered}.
54 * @see org.springframework.batch.core.ItemReadListener#afterRead(java.lang.Object)
55 */
56 @Override
57 public void afterRead(T item) {
58 for (Iterator<ItemReadListener<? super T>> iterator = listeners.reverse(); iterator.hasNext();) {
59 ItemReadListener<? super T> listener = iterator.next();
60 listener.afterRead(item);
61 }
62 }
63
64 /**
65 * Call the registered listeners in order, respecting and prioritising those
66 * that implement {@link Ordered}.
67 * @see org.springframework.batch.core.ItemReadListener#beforeRead()
68 */
69 @Override
70 public void beforeRead() {
71 for (Iterator<ItemReadListener<? super T>> iterator = listeners.iterator(); iterator.hasNext();) {
72 ItemReadListener<? super T> listener = iterator.next();
73 listener.beforeRead();
74 }
75 }
76
77 /**
78 * Call the registered listeners in reverse order, respecting and
79 * prioritising those that implement {@link Ordered}.
80 * @see org.springframework.batch.core.ItemReadListener#onReadError(java.lang.Exception)
81 */
82 @Override
83 public void onReadError(Exception ex) {
84 for (Iterator<ItemReadListener<? super T>> iterator = listeners.iterator(); iterator.hasNext();) {
85 ItemReadListener<? super T> listener = iterator.next();
86 listener.onReadError(ex);
87 }
88 }
89 }