package com.fastbee.common.utils.uuid;
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import lombok.extern.slf4j.Slf4j;
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import com.fastbee.common.utils.Md5Utils;
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import java.util.Random;
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/**
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* ID生成器工具类
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*
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* @author ruoyi
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*/
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@Slf4j
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public class IdUtils
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{
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private static long lastTimestamp = -1L;
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private long sequence = 0L;
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private final long workerId;
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private final long datacenterId;
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private static Integer startIndex=0;
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private static Integer endIndex=6;
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public IdUtils(long workerId, long datacenterId) {
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if(workerId <= 31L && workerId >= 0L) {
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this.workerId = workerId;
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} else {
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if(workerId != -1L) {
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throw new IllegalArgumentException("worker Id can't be greater than %d or less than 0");
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}
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this.workerId = (long)(new Random()).nextInt(31);
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}
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if(datacenterId <= 31L && datacenterId >= 0L) {
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this.datacenterId = datacenterId;
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} else {
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if(datacenterId != -1L) {
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throw new IllegalArgumentException("datacenter Id can't be greater than %d or less than 0");
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}
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this.datacenterId = (long)(new Random()).nextInt(31);
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}
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}
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public synchronized long nextId() {
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long timestamp = this.timeGen();
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if(timestamp < lastTimestamp) {
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try {
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throw new Exception("Clock moved backwards. Refusing to generate id for " + (lastTimestamp - timestamp) + " milliseconds");
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} catch (Exception e) {
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log.warn("生成ID异常", e);
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}
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}
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if(lastTimestamp == timestamp) {
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this.sequence = this.sequence + 1L & 4095L;
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if(this.sequence == 0L) {
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timestamp = this.tilNextMillis(lastTimestamp);
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}
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} else {
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this.sequence = 0L;
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}
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lastTimestamp = timestamp;
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return timestamp - 1288834974657L << 22 | this.datacenterId << 17 | this.workerId << 12 | this.sequence;
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}
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private long tilNextMillis(long lastTimestamp) {
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long timestamp;
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for(timestamp = this.timeGen(); timestamp <= lastTimestamp; timestamp = this.timeGen()) {
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;
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}
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return timestamp;
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}
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private long timeGen() {
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return System.currentTimeMillis();
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}
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public static String uuid() {
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return java.util.UUID.randomUUID().toString().replaceAll("-", "");
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}
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public static String getNextCode() {
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return Md5Utils.md5(IdUtils.uuid() + System.currentTimeMillis()).substring(startIndex,endIndex);
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}
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/**
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* 获取随机UUID
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*
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* @return 随机UUID
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*/
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public static String randomUUID()
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{
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return UUID.randomUUID().toString();
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}
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/**
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* 简化的UUID，去掉了横线
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*
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* @return 简化的UUID，去掉了横线
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*/
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public static String simpleUUID()
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{
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return UUID.randomUUID().toString(true);
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}
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/**
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* 获取随机UUID，使用性能更好的ThreadLocalRandom生成UUID
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*
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* @return 随机UUID
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*/
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public static String fastUUID()
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{
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return UUID.fastUUID().toString();
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}
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/**
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* 简化的UUID，去掉了横线，使用性能更好的ThreadLocalRandom生成UUID
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*
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* @return 简化的UUID，去掉了横线
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*/
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public static String fastSimpleUUID()
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{
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return UUID.fastUUID().toString(true);
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}
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}
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