public void GeneratedUUID_ShouldHaveProperVersion(UUIDGenerationMode mode)
{
var generator = new TimeBasedGenerator();
var expectedVersion = 0x10;
var guid = generator.GenerateGuid(mode);
var array = guid.ToByteArray();
Assert.Equal(expectedVersion, array[7] & 0xf0);
}
/// <summary>
/// Generates a RFC4122 time based UUID in the give <paramref name="mode"/>.
/// </summary>
/// <param name="mode">Use <c>UUIDGenerationMode.FasterGeneration</c> for faster UUID generation, without synchronizing the system clock.
/// Use <c>UUIDGenerationMode.WithUniquenessGuarantee</c> to synchronize system clock. Later approach may be slower than the former one.</param>
/// <returns></returns>
public Guid GenerateGuid(UUIDGenerationMode mode)
{
if (mode == UUIDGenerationMode.FasterGeneration)
{
var clockSequenceData = ReadClockSequenceBytes();
return(GenerateGuid(DateTimeOffset.UtcNow, clockSequenceData, macAddressBytes));
}
var now = DateTimeOffset.UtcNow;
if (now <= lastClockSyncedAt)
{
lock (mutex)
{
if (now <= lastClockSyncedAt)
{
UpdateClockSequenceBytes();
lastClockSyncedAt = now;
}
}
}
return(GenerateGuid(now, ReadClockSequenceBytes(), macAddressBytes));
}