spring-batch ItemReadListener 源码

  • 2022-08-16
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spring-batch ItemReadListener 代码

文件路径:/spring-batch-core/src/main/java/org/springframework/batch/core/ItemReadListener.java

/*
 * Copyright 2006-2022 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;

import org.springframework.batch.item.ItemReader;

/**
 * Listener interface around the reading of an item.
 *
 * @author Lucas Ward
 * @author Mahmoud Ben Hassine
 *
 */
public interface ItemReadListener<T> extends StepListener {

	/**
	 * Called before {@link ItemReader#read()}
	 */
	default void beforeRead() {
	}

	/**
	 * Called after {@link ItemReader#read()}. This method is called only for actual items
	 * (that is, it is not called when the reader returns {@code null}).
	 * @param item returned from read()
	 */
	default void afterRead(T item) {
	}

	/**
	 * Called if an error occurs while trying to read.
	 * @param ex thrown from {@link ItemReader}
	 */
	default void onReadError(Exception ex) {
	}

}

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