text: /**
   * Notes: 搜索模块业务逻辑
   * Ver : CCMiniCloud Framework 2.0.1 ALL RIGHTS RESERVED BY cclinux@qq.com
   * Date: 2020-11-14 07:48:00 
   */
  
  const BaseBiz = require('./base_biz.js');
  const cacheHelper = require('../helper/cache_helper.js');
  
  /**
   * 
   */
  class SearchBiz extends BaseBiz {
  	
  	static clearHistory(key){
  		cacheHelper.remove(key);
  	}
  
  	static getHistory(key)
  	{ 
  		return cacheHelper.get(key, []);
  
  	}
  
  	/**添加关键字缓存
  	 * 
  	 * @param {*} key 
  	 * @param {*} val 
  	 * @param {*} size 个数
  	 * @param {*} expire 过期时间
  	 */
  	static addHistory(key, val, size = 20, expire = 86400 * 30)  {
  		if (!val || val.length == 0) return [];
  		
  		let his = cacheHelper.get(key, []);
  		
  		//查询是否存在 并删除
  		let pos = his.indexOf(val);	 
  		if (pos > -1) his.splice(pos, 1);
   
  		// 加到头部
  		his.unshift(val);
   
  		// 判断个数， 多的删除
  		if (his.length > size)
  			his.splice(his.length - 1, 1);
  			
  		// 存缓存
  		cacheHelper.set(key, his, expire);
  
  		return his;
  	}
  
  }
  
  module.exports = SearchBiz;