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ValueStopwatch.cs
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40 lines (32 loc) · 1.44 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
namespace Microsoft.Extensions.Internal
{
internal struct ValueStopwatch
{
private static readonly double TimestampToTicks = TimeSpan.TicksPerSecond / (double)Stopwatch.Frequency;
private long _startTimestamp;
public bool IsActive => _startTimestamp != 0;
private ValueStopwatch(long startTimestamp)
{
_startTimestamp = startTimestamp;
}
public static ValueStopwatch StartNew() => new ValueStopwatch(Stopwatch.GetTimestamp());
public TimeSpan GetElapsedTime()
{
// Start timestamp can't be zero in an initialized ValueStopwatch. It would have to be literally the first thing executed when the machine boots to be 0.
// So it being 0 is a clear indication of default(ValueStopwatch)
if (!IsActive)
{
throw new InvalidOperationException("An uninitialized, or 'default', ValueStopwatch cannot be used to get elapsed time.");
}
var end = Stopwatch.GetTimestamp();
var timestampDelta = end - _startTimestamp;
var ticks = (long)(TimestampToTicks * timestampDelta);
return new TimeSpan(ticks);
}
}
}