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IdGenerator.cs
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IdGenerator.cs
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using System;
using System.Runtime.CompilerServices;
namespace Snowflake53
{
public class IdGenerator
{
public static readonly DateTime DefaultEpoch = new DateTime(2019, 7, 1, 0, 0, 0, DateTimeKind.Utc);
private static readonly ITimeSource timesource = new DefaultTimeSource(DefaultEpoch);
private int _sequence;
private long _lastgen = -1;
private readonly int _generatorId;
private readonly object _genlock = new object();
public IdGenerator() : this(0) { }
public IdGenerator(int generatorId)
{
_generatorId = generatorId & 3;
}
public long CreateId()
{
lock (_genlock)
{
var ticks = GetTicks();
var timestamp = ticks & GetMask(41);
if (timestamp == _lastgen)
{
_sequence++;
}
else
{
_sequence = 0;
_lastgen = timestamp;
}
unchecked
{
return (timestamp << 12)
+ (_generatorId << 10)
+ _sequence;
}
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private long GetTicks()
{
return timesource.GetTicks();
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static long GetMask(byte bits)
{
return (1L << bits) - 1;
}
}
}