SnowFlakeId Generator
This commit is contained in:
MaxKey
69
maxkey-common/src/main/java/org/maxkey/util/IdGenerator.java
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69
maxkey-common/src/main/java/org/maxkey/util/IdGenerator.java
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package org.maxkey.util;
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public class IdGenerator {
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String strategy = "uuid";
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int datacenterId;
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int machineId;
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SnowFlakeId snowFlakeId = new SnowFlakeId(0,0);
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StringGenerator stringGenerator = new StringGenerator();
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public String generate(){
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if(strategy.equalsIgnoreCase("uuid")) {
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return stringGenerator.uuidGenerate();
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}else if(strategy.equalsIgnoreCase("SnowFlake")) {
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return snowFlakeId.nextId()+"";
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}else {
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return stringGenerator.randomGenerate();
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}
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}
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public IdGenerator() {
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super();
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}
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public IdGenerator(String strategy) {
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super();
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this.strategy = strategy;
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}
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public int getDatacenterId() {
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return datacenterId;
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}
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public void setDatacenterId(int datacenterId) {
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this.datacenterId = datacenterId;
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}
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public int getMachineId() {
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return machineId;
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}
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public void setMachineId(int machineId) {
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this.machineId = machineId;
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}
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public SnowFlakeId getSnowFlakeId() {
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return snowFlakeId;
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}
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public void setSnowFlakeId(SnowFlakeId snowFlakeId) {
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this.snowFlakeId = snowFlakeId;
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}
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public StringGenerator getStringGenerator() {
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return stringGenerator;
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}
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public void setStringGenerator(StringGenerator stringGenerator) {
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this.stringGenerator = stringGenerator;
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}
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}
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191
maxkey-common/src/main/java/org/maxkey/util/SnowFlakeId.java
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191
maxkey-common/src/main/java/org/maxkey/util/SnowFlakeId.java
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package org.maxkey.util;
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import java.util.Calendar;
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import java.util.Date;
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/**
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* 描述: Twitter的分布式自增ID雪花算法snowflake (Java版)
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*
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* @author Crystal.Sea
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* @create 2021-04-17
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**/
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public class SnowFlakeId {
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/**
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* 起始的时间戳
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*/
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private final static long START_STMP = 1480166465631L;
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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; //序列号占用的位数
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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 DATACENTER_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_DATACENTER_NUM = -1L ^ (-1L << DATACENTER_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_SEQUENCE = -1L ^ (-1L << SEQUENCE_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 DATACENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT;
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private final static long TIMESTMP_LEFT = DATACENTER_LEFT + DATACENTER_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; //序列号
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private long lastStmp = -1L;//上一次时间戳
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private String dateTime;
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public SnowFlakeId(long datacenterId, long machineId) {
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if (datacenterId > MAX_DATACENTER_NUM || datacenterId < 0) {
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throw new IllegalArgumentException("datacenterId can't be greater than MAX_DATACENTER_NUM or less than 0");
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}
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if (machineId > MAX_MACHINE_NUM || machineId < 0) {
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throw new IllegalArgumentException("machineId can't be greater than MAX_MACHINE_NUM or less than 0");
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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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public SnowFlakeId(long datacenterId, long machineId, long sequence, long lastStmp) {
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super();
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this.datacenterId = datacenterId;
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this.machineId = machineId;
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this.sequence = sequence;
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this.lastStmp = lastStmp;
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dateTime =DateUtils.toUtc( fromatTime(lastStmp));
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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 currStmp = getNewstmp();
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if (currStmp < lastStmp) {
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throw new RuntimeException("Clock moved backwards. Refusing to generate id");
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}
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if (currStmp == lastStmp) {
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//相同毫秒内，序列号自增
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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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currStmp = getNextMill();
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}
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} else {
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//不同毫秒内，序列号置为0
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sequence = 0L;
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}
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lastStmp = currStmp;
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return (currStmp - START_STMP) << TIMESTMP_LEFT //时间戳部分
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| datacenterId << DATACENTER_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; //序列号部分
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}
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private long getNextMill() {
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long mill = getNewstmp();
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while (mill <= lastStmp) {
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mill = getNewstmp();
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}
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return mill;
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}
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private long getNewstmp() {
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return System.currentTimeMillis();
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}
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public SnowFlakeId parse(long id) {
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String sonwFlakeId = Long.toBinaryString(id);
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System.out.println(sonwFlakeId);
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int len = sonwFlakeId.length();
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int sequenceStart = (int) (len < MACHINE_LEFT ? 0 : len - MACHINE_LEFT);
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int workerStart = (int) (len < DATACENTER_LEFT ? 0 : len - DATACENTER_LEFT);
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int timeStart = (int) (len < TIMESTMP_LEFT ? 0 : len - TIMESTMP_LEFT);
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String sequence = sonwFlakeId.substring(sequenceStart, len);
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String workerId = sequenceStart == 0 ? "0" : sonwFlakeId.substring(workerStart, sequenceStart);
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String dataCenterId = workerStart == 0 ? "0" : sonwFlakeId.substring(timeStart, workerStart);
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String time = timeStart == 0 ? "0" : sonwFlakeId.substring(0, timeStart);
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int sequenceInt = Integer.valueOf(sequence, 2);
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int workerIdInt = Integer.valueOf(workerId, 2);
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int dataCenterIdInt = Integer.valueOf(dataCenterId, 2);
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long diffTime = Long.parseLong(time, 2);
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long timeLong = diffTime + START_STMP;
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SnowFlakeId snowFlakeIdParse =new SnowFlakeId(dataCenterIdInt,workerIdInt,sequenceInt,timeLong);
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return snowFlakeIdParse;
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}
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private static Date fromatTime(long date) {
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Calendar calendar = Calendar.getInstance();
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calendar.setTimeInMillis(date);
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return calendar.getTime();
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}
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public long getDatacenterId() {
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return datacenterId;
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}
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public void setDatacenterId(long datacenterId) {
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this.datacenterId = datacenterId;
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}
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public long getMachineId() {
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return machineId;
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}
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public void setMachineId(long machineId) {
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this.machineId = machineId;
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}
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public long getSequence() {
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return sequence;
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}
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public void setSequence(long sequence) {
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this.sequence = sequence;
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}
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public long getLastStmp() {
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return lastStmp;
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}
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public void setLastStmp(long lastStmp) {
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this.lastStmp = lastStmp;
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}
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public String getDateTime() {
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return dateTime;
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}
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public void setDateTime(String dateTime) {
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this.dateTime = dateTime;
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}
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public static void main(String[] args) {
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SnowFlakeId snowFlake = new SnowFlakeId(20, 30);
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long start = System.currentTimeMillis();
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for (int i = 0; i < 1000000; i++) {
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System.out.println(snowFlake.nextId());
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}
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System.out.println(System.currentTimeMillis() - start);
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}
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}
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@@ -0,0 +1,32 @@
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/*
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* Copyright [2020] [MaxKey of copyright http://www.maxkey.top]
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.maxkey.util;
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import org.junit.Test;
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public class SonwFlakeIdTest {
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@Test
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public void UidGenerator() {
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SnowFlakeId snowFlake = new SnowFlakeId(2, 3);
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long seq = snowFlake.nextId();
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System.out.println(seq);
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System.out.println(snowFlake.parse(seq));
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}
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}
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@@ -56,4 +56,5 @@ public class UUIDGeneratorTest {
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}
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}
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