package com.ruoyi.web.tool;
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/**
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* id生成器
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*/
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public class IDUtil {
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/**
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* 存储时间戳
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*/
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private static long timestamp = System.currentTimeMillis();
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/**
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* 自增长值
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*/
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private static int self = 0;
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/**
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* 最大自增长值
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*/
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private static int max_self = 9999;
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/**
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* 设备号
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*/
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private static int device = 0;
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/**
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* 时针回拨增长值
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*/
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private static int hour_hand_variable = 0;
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/**
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* 时针回拨最大增长值
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*/
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private static int max_hour_hand_variable = 999;
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/**
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* 时间戳id
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* @return
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*/
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public static long timestamp_id(){
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return timestamp;
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}
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/**
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* 生成唯一ID
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* @return
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*/
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public static long sole_id(){
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return sole_id(null);
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}
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/**
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* 唯一ID生成
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* @param workId 工作ID
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* @return
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*/
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public synchronized static long sole_id(Integer workId){
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if(null != workId){
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device = workId;
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}
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long timeMillis = System.currentTimeMillis();
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/**
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* 时间戳相同
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* 自增长值使用完后，休眠等待时间戳更新
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*/
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if(timeMillis == timestamp && self > max_self){
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try {
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Thread.sleep(1);
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self = 0;
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return sole_id(workId);
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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}
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//处理时针回拨的情况
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if(timeMillis < timestamp) {
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if (hour_hand_variable >= max_hour_hand_variable) {
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hour_hand_variable = 0;
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} else {
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hour_hand_variable++;
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}
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}
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//处理
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if(timeMillis > timestamp){
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timestamp = timeMillis;
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self = 0;
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}
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return splice();
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}
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/**
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* 拼接最终的id
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* @return
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*/
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private static long splice(){
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//格式化自增长数据格式，前位补0
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String format = String.format("%04d", self);
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Long id = Long.valueOf(timestamp + "" + hour_hand_variable + "" + device + format);
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self++;
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return id;
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}
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}
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