/*
* 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.ItemProcessListener;
import org.springframework.core.Ordered;
/**
* @author Dave Syer
*
*/
public class CompositeItemProcessListener<T, S> implements ItemProcessListener<T, S> {
private OrderedComposite<ItemProcessListener<? super T, ? super S>> listeners = new OrderedComposite<ItemProcessListener<? super T, ? super S>>();
/**
* Public setter for the listeners.
*
* @param itemReadListeners
*/
public void setListeners(List<? extends ItemProcessListener<? super T, ? super S>> itemReadListeners) {
this.listeners.setItems(itemReadListeners);
}
/**
* Register additional listener.
*
* @param itemReaderListener
*/
public void register(ItemProcessListener<? super T, ? super S> itemReaderListener) {
listeners.add(itemReaderListener);
}
/**
* Call the registered listeners in reverse order, respecting and
* prioritising those that implement {@link Ordered}.
* @see org.springframework.batch.core.ItemProcessListener#afterProcess(java.lang.Object,
* java.lang.Object)
*/
@Override
public void afterProcess(T item, S result) {
for (Iterator<ItemProcessListener<? super T, ? super S>> iterator = listeners.reverse(); iterator.hasNext();) {
ItemProcessListener<? super T, ? super S> listener = iterator.next();
listener.afterProcess(item, result);
}
}
/**
* Call the registered listeners in order, respecting and prioritising those
* that implement {@link Ordered}.
* @see org.springframework.batch.core.ItemProcessListener#beforeProcess(java.lang.Object)
*/
@Override
public void beforeProcess(T item) {
for (Iterator<ItemProcessListener<? super T, ? super S>> iterator = listeners.iterator(); iterator.hasNext();) {
ItemProcessListener<? super T, ? super S> listener = iterator.next();
listener.beforeProcess(item);
}
}
/**
* Call the registered listeners in reverse order, respecting and
* prioritising those that implement {@link Ordered}.
* @see org.springframework.batch.core.ItemProcessListener#onProcessError(java.lang.Object,
* java.lang.Exception)
*/
@Override
public void onProcessError(T item, Exception e) {
for (Iterator<ItemProcessListener<? super T, ? super S>> iterator = listeners.reverse(); iterator.hasNext();) {
ItemProcessListener<? super T, ? super S> listener = iterator.next();
listener.onProcessError(item, e);
}
}
}