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1   /*
2    * Copyright 2006-2008 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.springframework.batch.core;
17  
18  import org.springframework.batch.item.ItemReader;
19  import org.springframework.batch.item.ItemWriter;
20  
21  /**
22   * Listener interface around the reading of an item.
23   * 
24   * @author Lucas Ward
25   *
26   */
27  public interface ItemReadListener<T> extends StepListener {
28  
29  	/**
30  	 * Called before {@link ItemReader#read()}
31  	 */
32  	void beforeRead();
33  	
34  	/**
35  	 * Called after {@link ItemReader#read()}
36  	 * 
37  	 * @param item returned from read()
38  	 */
39  	void afterRead(T item);
40  	
41  	/**
42  	 * Called if an error occurs while trying to read.
43  	 * 
44  	 * @param ex thrown from {@link ItemWriter}
45  	 */
46  	void onReadError(Exception ex);
47  }