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package com.java3y.austin.support.utils;
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/**
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* 雪花算法生成唯一id工具类
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*
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* @author cao
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* @date 2022-04-20 13:12
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*/
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public class SnowFlakeIdUtils {
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/**
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* 初始时间截 (2017-01-01)
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*/
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private final static long START_TIMESTAMP = 1483200000000L;
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/**
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* 每一部分占用的位数
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*/
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private final static long SEQUENCE_BIT = 12; //***占用的位数
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private final static long MACHINE_BIT = 5; //机器标识占用的位数
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private final static long DATA_CENTER_BIT = 5; //数据中心占用的位数
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/**
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* 每一部分的最大值
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*/
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private final static long MAX_SEQUENCE = -1L ^ (-1L << SEQUENCE_BIT);
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private final static long MAX_MACHINE_NUM = -1L ^ (-1L << MACHINE_BIT);
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private final static long MAX_DATA_CENTER_NUM = -1L ^ (-1L << DATA_CENTER_BIT);
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/**
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* 每一部分向左的位移
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*/
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private final static long MACHINE_LEFT = SEQUENCE_BIT;
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private final static long DATA_CENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT;
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private final static long TIMESTAMP_LEFT = DATA_CENTER_LEFT + DATA_CENTER_BIT;
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private long dataCenterId; //数据中心
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private long machineId; //机器标识
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private long sequence = 0L; //***
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private long lastTimeStamp = -1L; //上一次时间戳
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/**
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* 根据指定的数据中心ID和机器标志ID生成指定的***
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*
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* @param dataCenterId 数据中心ID
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* @param machineId 机器标志ID
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*/
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public SnowFlakeIdUtils(long dataCenterId, long machineId) {
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if (dataCenterId > MAX_DATA_CENTER_NUM || dataCenterId < 0) {
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throw new IllegalArgumentException(String.format("DtaCenterId 不能大于 %d 或小于 0", MAX_DATA_CENTER_NUM));
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}
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if (machineId > MAX_MACHINE_NUM || machineId < 0) {
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throw new IllegalArgumentException(String.format("MachineId 不能大于 %d 或小于 0", MAX_MACHINE_NUM));
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}
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this.dataCenterId = dataCenterId;
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this.machineId = machineId;
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}
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/**
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* 产生下一个ID
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*
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* @return
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*/
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public synchronized long nextId() {
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long currTimeStamp = System.currentTimeMillis();
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if (currTimeStamp < lastTimeStamp) {
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throw new RuntimeException("当前时间小于上一次记录的时间戳！");
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}
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if (currTimeStamp == lastTimeStamp) {
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//相同毫秒内，***自增
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sequence = (sequence + 1) & MAX_SEQUENCE;
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//同一毫秒的序列数已经达到最大
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if (sequence == 0L) {
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currTimeStamp = getNextMill();
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}
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} else {
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//不同毫秒内，***置为0
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sequence = 0L;
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}
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lastTimeStamp = currTimeStamp;
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return (currTimeStamp - START_TIMESTAMP) << TIMESTAMP_LEFT //时间戳部分
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| dataCenterId << DATA_CENTER_LEFT //数据中心部分
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| machineId << MACHINE_LEFT //机器标识部分
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| sequence; //***部分
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}
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/**
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* 阻塞到下一个毫秒，直到获得新的时间戳
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*
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* @return 当前时间戳
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*/
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private long getNextMill() {
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long mill = System.currentTimeMillis();
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while (mill <= lastTimeStamp) {
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mill = System.currentTimeMillis();
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}
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return mill;
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}
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}
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3y
3 years ago