27 lines
1.1 KiB
C#
27 lines
1.1 KiB
C#
namespace Monitor.Measurement;
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/// <summary>节点的单调时钟（微秒）：t1…t4、t_send、t_recv 都用它；Probe 和 Agent 各自一个，块头里的时钟锚点把它对应到 UTC。</summary>
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public sealed class MonoClock
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{
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private readonly TimeProvider _time;
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public MonoClock(TimeProvider time)
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{
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_time = time;
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}
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public TimeProvider Time => _time;
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public long NowUs()
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{
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long ticks = _time.GetTimestamp();
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// 先除后乘会丢精度，先乘再除在 64 位内不会溢出（频率通常是 1e9 或 1e7）
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return (ticks / _time.TimestampFrequency * 1_000_000) + (ticks % _time.TimestampFrequency * 1_000_000 / _time.TimestampFrequency);
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}
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public ClockAnchor Anchor() => new(NowUs(), _time.GetUtcNow().ToUnixTimeMilliseconds());
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/// <summary>单调时钟读数 <paramref name="thenUs"/> 对应的 UTC 毫秒（只用于块的粗略起点，精确时间由块头的时钟锚点换算）。</summary>
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public long UtcMsAt(long thenUs) => _time.GetUtcNow().ToUnixTimeMilliseconds() - (Math.Max(0, NowUs() - thenUs) / 1000);
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}
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