/*
 *      Copyright (c) 2018-2028, Chill Zhuang All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *  Neither the name of the dreamlu.net developer nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 *  Author: Chill 庄骞 (smallchill@163.com)
 */
package org.springblade.common.excel.listener;

import java.util.ArrayList;
import java.util.List;

import org.springblade.common.excel.support.ExcelImporter;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.RequiredArgsConstructor;

/**
 * Excel监听器
 *
 * @author Chill
 */
@Data
@RequiredArgsConstructor
@EqualsAndHashCode(callSuper = true)
public class ImportListener<T> extends AnalysisEventListener<T> {

	/**
	 * 默认每隔3000条存储数据库
	 */
	private int batchCount = 3000;
	/**
	 * 缓存的数据列表
	 */
	private List<T> list = new ArrayList<>();
	/**
	 * 数据导入类
	 */
	private final ExcelImporter<T> importer;

	@Override
	public void invoke(T data, AnalysisContext analysisContext) {
		list.add(data);
		// 达到BATCH_COUNT，则调用importer方法入库，防止数据几万条数据在内存，容易OOM
		if (list.size() >= batchCount) {
			// 调用importer方法
			importer.save(list);
			// 存储完成清理list
			list.clear();
		}
	}

	@Override
	public void doAfterAllAnalysed(AnalysisContext analysisContext) {
		// 调用importer方法
		importer.save(list);
		// 存储完成清理list
		list.clear();
	}

}
