EgovRetrySampleItemWriter.java

/*
 * Copyright 2006-2007 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 egovframework.brte.sample.example.support;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.item.ItemWriter;

import java.util.List;

/**
 * 재시도가 일어나는지 확인하기 위해, 특정 구간동안 에러를 생성하는 Writer 클래스
 * 
 * @author 배치실행개발팀
 * @since 2012. 07.30
 * @version 1.0
 * @see
 * 
 * <pre>
 * << 개정이력(Modification Information) >>
 *   
 *   수정일               수정자               수정내용
 *  -------      --------     ---------------------------
 *  2012. 07.30  배치실행개발팀    최초 생성
 *
 * </pre>
 */
public class EgovRetrySampleItemWriter<T> implements ItemWriter<T> {

	private static final Log logger = LogFactory.getLog(EgovRetrySampleItemWriter.class);
	//write한 데이터라인수
	private int counter = 0;

	/**
	  * write하다가 retry 함  
	  */
	public void write(List<? extends T> items) throws Exception {

		logger.info("Writing... " + items);

		int current = counter;
		counter += items.size();
		if (current < 3 && (counter >= 2 || counter >= 3)) {
			/*
			 * 자료가 총 3라인이 쓰여지기전에 (current 0~2 까지) counter가 2,3 일 경우 (2번) 
			 * RuntimeException 을 내어 retry 하도록 만듦
			 * retry Limit 이 3 이므로, 총 2번의 재시도를 넘어감 (최초 try 1번 포함)
			 * retry Limit 이 2 라면, counter 가 3일때  RuntimeException 에러 남
			 */
			throw new RuntimeException("Temporary error");
		}
	}

	/**
	 * write 한  데이터라인 수를 가져온다.
	 * @return
	 */
	public int getCounter() {
		return counter;
	}

}