package com.nova.sankuai.domain.api.yinsheng;
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import com.nova.sankuai.infra.config.ServerName;
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import org.springframework.stereotype.Component;
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import javax.annotation.Resource;
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import java.security.SecureRandom;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Random;
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/**
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* 随机序列生成器
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*/
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@Component
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public class SerialGenerator {
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/**
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* 以随机种子初始化random对象
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*/
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private static final Random RANDOM = new SecureRandom();
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/**
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* 内部交易码长度
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*/
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private static final int INTER_TRANS_ID_LENGTH = 32;
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/**
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* 日期格式化模板
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*/
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private static ThreadLocal<SimpleDateFormat> dateFormatFactory = ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyyMMddHHmmssSSS"));
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private static final String DEFAULT_TANSID_TYPE = "10";
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private static final char[] mm = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
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@Resource
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ServerName serverName;
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/**
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* 生成规则 17位日期毫秒数 + 消息类型（10) + 随机数补齐32位
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*/
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public static String getOrder() {
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StringBuilder sb = new StringBuilder();
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sb.append(dateFormatFactory.get().format(new Date())).append(DEFAULT_TANSID_TYPE)
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.append(generateRandomSerial(INTER_TRANS_ID_LENGTH - sb.length()));
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return sb.toString();
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}
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/**
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* 获取带有服务器名作为后缀的订单号
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* @return 订单号
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*/
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public String getOrderWithServerName() {
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StringBuilder sb = new StringBuilder();
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sb.append(dateFormatFactory.get().format(new Date())).append(DEFAULT_TANSID_TYPE)
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.append(generateRandomSerial(INTER_TRANS_ID_LENGTH - sb.length())).append(serverName.getServerName());
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return sb.toString();
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}
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/**
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* 生成len长度的随机数序列
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*
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* @return String randomString
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*/
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public static String generateRandomSerial(int len) {
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < len; i++) {
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sb.append(mm[RANDOM.nextInt(mm.length)]);
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}
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return sb.toString();
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}
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}
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