/*
* Copyright 2006-2013 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.batch.core.listener;
import java.util.Iterator;
import java.util.List;
import org.springframework.batch.core.ChunkListener;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.core.Ordered;
/**
* @author Lucas Ward
*
*/
public class CompositeChunkListener implements ChunkListener {
private OrderedComposite<ChunkListener> listeners = new OrderedComposite<ChunkListener>();
/**
* Public setter for the listeners.
*
* @param listeners
*/
public void setListeners(List<? extends ChunkListener> listeners) {
this.listeners.setItems(listeners);
}
/**
* Register additional listener.
*
* @param chunkListener
*/
public void register(ChunkListener chunkListener) {
listeners.add(chunkListener);
}
/**
* Call the registered listeners in order, respecting and prioritizing those
* that implement {@link Ordered}.
*
* @see org.springframework.batch.core.ChunkListener#afterChunk(ChunkContext context)
*/
@Override
public void afterChunk(ChunkContext context) {
for (Iterator<ChunkListener> iterator = listeners.iterator(); iterator.hasNext();) {
ChunkListener listener = iterator.next();
listener.afterChunk(context);
}
}
/**
* Call the registered listeners in reverse order.
*
* @see org.springframework.batch.core.ChunkListener#beforeChunk(ChunkContext context)
*/
@Override
public void beforeChunk(ChunkContext context) {
for (Iterator<ChunkListener> iterator = listeners.reverse(); iterator.hasNext();) {
ChunkListener listener = iterator.next();
listener.beforeChunk(context);
}
}
@Override
public void afterChunkError(ChunkContext context) {
for (Iterator<ChunkListener> iterator = listeners.iterator(); iterator.hasNext();) {
ChunkListener listener = iterator.next();
listener.afterChunkError(context);
}
}
}