spring-batch CompositeItemReadListener 源码
spring-batch CompositeItemReadListener 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/listener/CompositeItemReadListener.java
/*
* 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
*
* https://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.ItemReadListener;
import org.springframework.core.Ordered;
/**
* @author Lucas Ward
* @author Dave Syer
*
*/
public class CompositeItemReadListener<T> implements ItemReadListener<T> {
private OrderedComposite<ItemReadListener<? super T>> listeners = new OrderedComposite<>();
/**
* Public setter for the listeners.
* @param itemReadListeners list of {@link ItemReadListener}s to be called when read
* events occur.
*/
public void setListeners(List<? extends ItemReadListener<? super T>> itemReadListeners) {
this.listeners.setItems(itemReadListeners);
}
/**
* Register additional listener.
* @param itemReaderListener instance of {@link ItemReadListener} to be registered.
*/
public void register(ItemReadListener<? super T> itemReaderListener) {
listeners.add(itemReaderListener);
}
/**
* Call the registered listeners in reverse order, respecting and prioritising those
* that implement {@link Ordered}.
* @see org.springframework.batch.core.ItemReadListener#afterRead(java.lang.Object)
*/
@Override
public void afterRead(T item) {
for (Iterator<ItemReadListener<? super T>> iterator = listeners.reverse(); iterator.hasNext();) {
ItemReadListener<? super T> listener = iterator.next();
listener.afterRead(item);
}
}
/**
* Call the registered listeners in order, respecting and prioritising those that
* implement {@link Ordered}.
* @see org.springframework.batch.core.ItemReadListener#beforeRead()
*/
@Override
public void beforeRead() {
for (Iterator<ItemReadListener<? super T>> iterator = listeners.iterator(); iterator.hasNext();) {
ItemReadListener<? super T> listener = iterator.next();
listener.beforeRead();
}
}
/**
* Call the registered listeners in reverse order, respecting and prioritising those
* that implement {@link Ordered}.
* @see org.springframework.batch.core.ItemReadListener#onReadError(java.lang.Exception)
*/
@Override
public void onReadError(Exception ex) {
for (Iterator<ItemReadListener<? super T>> iterator = listeners.reverse(); iterator.hasNext();) {
ItemReadListener<? super T> listener = iterator.next();
listener.onReadError(ex);
}
}
}
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