94 lines
3.3 KiB
C#
94 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Common
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{
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public class IdWorker
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{
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//起始的时间戳
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private static long START_STMP = 1480166465631L;
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//每一部分占用的位数
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private static int SEQUENCE_BIT = 12; //序列号占用的位数
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private static int MACHINE_BIT = 5; //机器标识占用的位数
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private static int DATACENTER_BIT = 5;//数据中心占用的位数
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//每一部分的最大值
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private static long MAX_DATACENTER_NUM = -1L ^ (-1L << DATACENTER_BIT);
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private static long MAX_MACHINE_NUM = -1L ^ (-1L << MACHINE_BIT);
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private static long MAX_SEQUENCE = -1L ^ (-1L << SEQUENCE_BIT);
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//每一部分向左的位移
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private static int MACHINE_LEFT = SEQUENCE_BIT;
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private static int DATACENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT;
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private static int TIMESTMP_LEFT = DATACENTER_LEFT + DATACENTER_BIT;
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private long datacenterId = 1; //数据中心
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private long machineId = 1; //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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#region 单例:完全懒汉
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private static readonly Lazy<IdWorker> lazy = new Lazy<IdWorker>(() => new IdWorker());
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public static IdWorker Singleton { get { return lazy.Value; } }
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private IdWorker() { }
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#endregion
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public IdWorker(long cid, long mid)
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{
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if (cid > MAX_DATACENTER_NUM || cid < 0) throw new Exception($"中心Id应在(0,{MAX_DATACENTER_NUM})之间");
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if (mid > MAX_MACHINE_NUM || mid < 0) throw new Exception($"机器Id应在(0,{MAX_MACHINE_NUM})之间");
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datacenterId = cid;
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machineId = mid;
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}
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/// <summary>
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/// 产生下一个ID
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/// </summary>
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/// <returns></returns>
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public long nextId()
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{
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long currStmp = getNewstmp();
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if (currStmp < lastStmp) throw new Exception("时钟倒退，Id生成失败！");
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if (currStmp == lastStmp)
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{
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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) currStmp = getNextMill();
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}
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else
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{
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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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{
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long mill = getNewstmp();
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while (mill <= lastStmp)
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{
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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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{
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return (long)(DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds;
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}
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}
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}
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