43 lines
1.7 KiB
C#
43 lines
1.7 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Threading;
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namespace Microsoft.AspNetCore.Connections
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{
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public static class CorrelationIdGenerator
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{
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// Base32 encoding - in ascii sort order for easy text based sorting
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private static readonly char[] s_encode32Chars = "0123456789ABCDEFGHIJKLMNOPQRSTUV".ToCharArray();
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// Seed the _lastConnectionId for this application instance with
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// the number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight, January 1, 0001
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// for a roughly increasing _lastId over restarts
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private static long _lastId = DateTime.UtcNow.Ticks;
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public static string GetNextId() => GenerateId(Interlocked.Increment(ref _lastId));
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private static string GenerateId(long id)
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{
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return string.Create(13, id, (buffer, value) =>
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{
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char[] encode32Chars = s_encode32Chars;
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buffer[12] = encode32Chars[value & 31];
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buffer[11] = encode32Chars[(value >> 5) & 31];
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buffer[10] = encode32Chars[(value >> 10) & 31];
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buffer[9] = encode32Chars[(value >> 15) & 31];
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buffer[8] = encode32Chars[(value >> 20) & 31];
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buffer[7] = encode32Chars[(value >> 25) & 31];
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buffer[6] = encode32Chars[(value >> 30) & 31];
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buffer[5] = encode32Chars[(value >> 35) & 31];
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buffer[4] = encode32Chars[(value >> 40) & 31];
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buffer[3] = encode32Chars[(value >> 45) & 31];
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buffer[2] = encode32Chars[(value >> 50) & 31];
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buffer[1] = encode32Chars[(value >> 55) & 31];
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buffer[0] = encode32Chars[(value >> 60) & 31];
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});
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}
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}
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}
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