package com.jielu.util;
import org.apache.commons.lang3.time.FastDateFormat;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.support.atomic.RedisAtomicLong;
import org.springframework.stereotype.Component;
import java.util.Calendar;
@Component
public class RedisCreateOrderUtil {
@Autowired(required = false)
RedisTemplate redisTemplate;
static final String REDIS_INC_KEY="org:lylcol:order:redis:inc";
/**
* 用Redis计数器生成订单号,生成规则:前缀+年月日+Redis自增长序列号
* 劣势：依赖于Redis,消耗带宽,消耗流量.
* 优势：保证有序,而且每天的订单号增长都是从1开始自增的
* @param prefix 前缀字符
* @return 订单号 eg:Order201906110002
*/
public String genOrderNoByRedis(String prefix){
RedisAtomicLong entityIdCounter = new RedisAtomicLong(REDIS_INC_KEY, redisTemplate.getConnectionFactory());
Long increment = entityIdCounter.incrementAndGet();
Calendar cs= Calendar.getInstance();
//凌晨过期
cs.add(Calendar.DAY_OF_MONTH,1);
cs.set(Calendar.HOUR_OF_DAY,0);
cs.set(Calendar.MINUTE,0);
cs.set(Calendar.SECOND,0);
//设置第二天的凌晨00：00为失效期
if(increment==1L) {
entityIdCounter.expireAt(cs.getTime());
}
//补四位,缺失的位置用0补位
String importantKey=increment.toString();
if(importantKey.length()<4) {
importantKey = "0000".substring(0,4-importantKey.length())+importantKey;
}
//
String orderNO=String.format("%s%s%s",prefix, FastDateFormat.getInstance("yyyyMMdd").format(cs.getTime()),importantKey);
return orderNO;
}
}
