001/* 002 * Copyright 2006-2013 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.springframework.batch.core.listener; 017 018import java.util.Iterator; 019import java.util.List; 020 021import org.springframework.batch.core.ChunkListener; 022import org.springframework.batch.core.scope.context.ChunkContext; 023import org.springframework.core.Ordered; 024 025/** 026 * @author Lucas Ward 027 * 028 */ 029public class CompositeChunkListener implements ChunkListener { 030 031 private OrderedComposite<ChunkListener> listeners = new OrderedComposite<ChunkListener>(); 032 033 /** 034 * Public setter for the listeners. 035 * 036 * @param listeners list of {@link ChunkListener}. 037 */ 038 public void setListeners(List<? extends ChunkListener> listeners) { 039 this.listeners.setItems(listeners); 040 } 041 042 /** 043 * Register additional listener. 044 * 045 * @param chunkListener instance of {@link ChunkListener}. 046 */ 047 public void register(ChunkListener chunkListener) { 048 listeners.add(chunkListener); 049 } 050 051 /** 052 * Call the registered listeners in reverse order. 053 * 054 * @see org.springframework.batch.core.ChunkListener#afterChunk(ChunkContext context) 055 */ 056 @Override 057 public void afterChunk(ChunkContext context) { 058 for (Iterator<ChunkListener> iterator = listeners.reverse(); iterator.hasNext();) { 059 ChunkListener listener = iterator.next(); 060 listener.afterChunk(context); 061 } 062 } 063 064 /** 065 * Call the registered listeners in order, respecting and prioritizing those 066 * that implement {@link Ordered}. 067 * 068 * @see org.springframework.batch.core.ChunkListener#beforeChunk(ChunkContext context) 069 */ 070 @Override 071 public void beforeChunk(ChunkContext context) { 072 for (Iterator<ChunkListener> iterator = listeners.iterator(); iterator.hasNext();) { 073 ChunkListener listener = iterator.next(); 074 listener.beforeChunk(context); 075 } 076 } 077 078 /** 079 * Call the registered listeners in reverse order. 080 * 081 * @see org.springframework.batch.core.ChunkListener#afterChunkError(ChunkContext context) 082 */ 083 @Override 084 public void afterChunkError(ChunkContext context) { 085 for (Iterator<ChunkListener> iterator = listeners.reverse(); iterator.hasNext();) { 086 ChunkListener listener = iterator.next(); 087 listener.afterChunkError(context); 088 } 089 } 090}