| 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.ChunkListener; |
| 22 | import org.springframework.batch.core.scope.context.ChunkContext; |
| 23 | import org.springframework.core.Ordered; |
| 24 | |
| 25 | /** |
| 26 | * @author Lucas Ward |
| 27 | * |
| 28 | */ |
| 29 | public class CompositeChunkListener implements ChunkListener { |
| 30 | |
| 31 | private OrderedComposite<ChunkListener> listeners = new OrderedComposite<ChunkListener>(); |
| 32 | |
| 33 | /** |
| 34 | * Public setter for the listeners. |
| 35 | * |
| 36 | * @param listeners |
| 37 | */ |
| 38 | public void setListeners(List<? extends ChunkListener> listeners) { |
| 39 | this.listeners.setItems(listeners); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Register additional listener. |
| 44 | * |
| 45 | * @param chunkListener |
| 46 | */ |
| 47 | public void register(ChunkListener chunkListener) { |
| 48 | listeners.add(chunkListener); |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * Call the registered listeners in order, respecting and prioritizing those |
| 53 | * that implement {@link Ordered}. |
| 54 | * |
| 55 | * @see org.springframework.batch.core.ChunkListener#afterChunk(ChunkContext context) |
| 56 | */ |
| 57 | @Override |
| 58 | public void afterChunk(ChunkContext context) { |
| 59 | for (Iterator<ChunkListener> iterator = listeners.iterator(); iterator.hasNext();) { |
| 60 | ChunkListener listener = iterator.next(); |
| 61 | listener.afterChunk(context); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Call the registered listeners in reverse order. |
| 67 | * |
| 68 | * @see org.springframework.batch.core.ChunkListener#beforeChunk(ChunkContext context) |
| 69 | */ |
| 70 | @Override |
| 71 | public void beforeChunk(ChunkContext context) { |
| 72 | for (Iterator<ChunkListener> iterator = listeners.reverse(); iterator.hasNext();) { |
| 73 | ChunkListener listener = iterator.next(); |
| 74 | listener.beforeChunk(context); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | @Override |
| 79 | public void afterChunkError(ChunkContext context) { |
| 80 | for (Iterator<ChunkListener> iterator = listeners.iterator(); iterator.hasNext();) { |
| 81 | ChunkListener listener = iterator.next(); |
| 82 | listener.afterChunkError(context); |
| 83 | } |
| 84 | } |
| 85 | } |