54 lines
1.5 KiB
C#
54 lines
1.5 KiB
C#
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using System;
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namespace ZC
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{
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/// <summary>
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/// id生成器，当前使用的是时间戳作为id生成器的唯一id
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/// </summary>
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public static class IDGenerator
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{
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//
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private static long lastTimestamp = -1L;
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private static long sequence = 0L;
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private static readonly long twepoch = 1288834974657L; // Twitter Snowflake算法中的自定义起始时间
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private static readonly long machineId = 1L; // 机器码，可以自定义
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public static long Generate()
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{
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long timestamp = TimeGen();
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if (lastTimestamp == timestamp)
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{
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sequence = (sequence + 1) & 4095L;
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if (sequence == 0)
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{
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timestamp = TilNextMillis(lastTimestamp);
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}
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}
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else
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{
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sequence = 0L;
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}
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lastTimestamp = timestamp;
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return (timestamp - twepoch) << 22 | machineId << 12 | sequence;
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}
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private static long TilNextMillis(long lastTimestamp)
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{
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long timestamp = TimeGen();
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while (timestamp <= lastTimestamp)
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{
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timestamp = TimeGen();
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}
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return timestamp;
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}
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private static long TimeGen()
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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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