package com.webmanage.service.impl;
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import com.webmanage.service.OrderNoService;
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import com.webmanage.util.SnowflakeIdWorker;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.stereotype.Service;
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import javax.annotation.PostConstruct;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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/**
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* 订单编号服务实现
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*/
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@Service
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public class OrderNoServiceImpl implements OrderNoService {
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@Value("${snowflake.worker-id:1}")
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private long workerId;
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@Value("${snowflake.datacenter-id:1}")
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private long datacenterId;
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@Value("${snowflake.twepoch-ms:1577808000000}") // 2020-01-01 00:00:00
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private long twepochMs;
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private SnowflakeIdWorker idWorker;
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private static final DateTimeFormatter ORDER_PREFIX_FMT = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
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@PostConstruct
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public void init() {
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this.idWorker = new SnowflakeIdWorker(workerId, datacenterId, twepochMs);
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}
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@Override
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public String generateOrderNo() {
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long id = generateSnowflakeId();
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String timePrefix = LocalDateTime.now().format(ORDER_PREFIX_FMT);
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// 订单号格式：时间前缀 + 雪花ID后10位，保证长度与排序可读性
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String idStr = String.valueOf(id);
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String tail = idStr.length() > 10 ? idStr.substring(idStr.length() - 10) : String.format("%010d", id);
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return timePrefix + tail;
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}
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@Override
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public long generateSnowflakeId() {
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return idWorker.nextId();
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}
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}
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