118 lines
2.9 KiB
C#
118 lines
2.9 KiB
C#
using Microsoft.Extensions.Logging;
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namespace StopShopping.Services.Implementions;
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public class SerialNoGenerator : ISerialNoGenerator
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{
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public SerialNoGenerator(ILogger<SerialNoGenerator> logger)
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{
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_logger = logger;
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}
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private readonly ILogger<SerialNoGenerator> _logger;
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private const long START_UTC = 1767196800000; //2026-01-01 00:00:00.000
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private const int BITS_CALLBACK = 3;
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private const int BITS_SERIAL = 6;
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private const long MASK_CALLBACK = ~(-1L << BITS_CALLBACK); //0b_0111
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private const long MASK_SERIAL = ~(-1L << BITS_SERIAL);
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private readonly object _lockObj = new();
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private long _lastUtc = DateTimeOffset.Now.ToUnixTimeMilliseconds();
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private long _serial;
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private long _callbackSerial;
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/// <summary>
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/// <list type="table">
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/// <item>
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/// <term>
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/// 0000000
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/// </term>
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/// <term>
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/// 00000000000
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/// </term>
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/// <term>
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/// 00000000000
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/// </term>
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/// <term>
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/// 0000000000
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/// </term>
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/// </item>
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///
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/// <item>
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/// <term>
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/// 符号位1bit
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/// </term>
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/// </item>
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/// <term>
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/// 毫秒时间戳56bit
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/// </term>
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/// <term>
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/// 时间回拨标识3bit
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/// </term>
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/// <term>
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/// 毫秒内序号6bit
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/// </term>
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/// </list>
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/// </summary>
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/// <returns></returns>
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public string GenerateRequestNo()
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{
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lock (_lockObj)
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{
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var currUtc = DateTimeOffset.Now.ToUnixTimeMilliseconds();
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if (currUtc < _lastUtc) //时间回拨
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{
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currUtc = _lastUtc;
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_callbackSerial = (_callbackSerial + 1) & MASK_CALLBACK;
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if (_callbackSerial == 0) //时间回拨标识数据段用完
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{
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_logger.LogWarning("服务器时间不准，序列号可能重复，请检查！");
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}
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}
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if (currUtc > _lastUtc)
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{
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_serial = 1;
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_callbackSerial = 0;
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}
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else
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{
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_serial = (_serial + 1) & MASK_SERIAL;
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if (_serial == 0) //毫秒内数据段用完
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{
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WaitNextMilliSecond(ref currUtc);
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_serial = 1;
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}
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}
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_lastUtc = currUtc;
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long serial = ((currUtc - START_UTC) << BITS_CALLBACK + BITS_SERIAL)
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| (_callbackSerial << BITS_SERIAL)
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| _serial;
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return string.Format("R{0}", serial);
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}
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}
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public string GenerateProductNo()
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{
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throw new NotImplementedException();
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}
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private void WaitNextMilliSecond(ref long curr)
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{
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while (_lastUtc >= curr)
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{
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curr = DateTimeOffset.Now.ToUnixTimeMilliseconds();
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}
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}
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public string GenerateRandomPassword()
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{
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throw new NotImplementedException();
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}
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} |