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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.SkipListener;
22  import org.springframework.core.Ordered;
23  
24  /**
25   * @author Dave Syer
26   *
27   */
28  public class CompositeSkipListener<T,S> implements SkipListener<T,S> {
29  
30  	private OrderedComposite<SkipListener<? super T,? super S>> listeners = new OrderedComposite<SkipListener<? super T,? super S>>();
31  
32  	/**
33  	 * Public setter for the listeners.
34  	 *
35  	 * @param listeners
36  	 */
37  	public void setListeners(List<? extends SkipListener<? super T,? super S>> listeners) {
38  		this.listeners.setItems(listeners);
39  	}
40  
41  	/**
42  	 * Register additional listener.
43  	 *
44  	 * @param listener
45  	 */
46  	public void register(SkipListener<? super T,? super S> listener) {
47  		listeners.add(listener);
48  	}
49  
50  	/**
51  	 * Call the registered listeners in order, respecting and prioritising those
52  	 * that implement {@link Ordered}.
53  	 * @see org.springframework.batch.core.SkipListener#onSkipInRead(java.lang.Throwable)
54  	 */
55  	@Override
56  	public void onSkipInRead(Throwable t) {
57  		for (Iterator<SkipListener<? super T,? super S>> iterator = listeners.iterator(); iterator.hasNext();) {
58  			SkipListener<? super T,? super S> listener = iterator.next();
59  			listener.onSkipInRead(t);
60  		}
61  	}
62  
63  	/**
64  	 * Call the registered listeners in order, respecting and prioritising those
65  	 * that implement {@link Ordered}.
66  	 * @see org.springframework.batch.core.SkipListener#onSkipInWrite(java.lang.Object,
67  	 * java.lang.Throwable)
68  	 */
69  	@Override
70  	public void onSkipInWrite(S item, Throwable t) {
71  		for (Iterator<SkipListener<? super T,? super S>> iterator = listeners.iterator(); iterator.hasNext();) {
72  			SkipListener<? super T,? super S> listener = iterator.next();
73  			listener.onSkipInWrite(item, t);
74  		}
75  	}
76  
77  	/**
78  	 * Call the registered listeners in order, respecting and prioritising those
79  	 * that implement {@link Ordered}.
80  	 * @see org.springframework.batch.core.SkipListener#onSkipInWrite(java.lang.Object,
81  	 * java.lang.Throwable)
82  	 */
83  	@Override
84  	public void onSkipInProcess(T item, Throwable t) {
85  		for (Iterator<SkipListener<? super T,? super S>> iterator = listeners.iterator(); iterator.hasNext();) {
86  			SkipListener<? super T,? super S> listener = iterator.next();
87  			listener.onSkipInProcess(item, t);
88  		}
89  	}
90  
91  }