src/csharp/Grpc.IntegrationTesting/WallClockStopwatch.cs

#region Copyright notice and license

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#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using Google.Protobuf;
using Grpc.Core;
using Grpc.Core.Utils;
using NUnit.Framework;
using Grpc.Testing;

namespace Grpc.IntegrationTesting
{
    /// <summary>
    /// Snapshottable wall clock stopwatch.
    /// </summary>
    public class WallClockStopwatch
    {
        long startTicks;

        public WallClockStopwatch()
        {
            this.startTicks = DateTime.UtcNow.Ticks;
        }

        public TimeSpan GetElapsedSnapshot(bool reset)
        {
            var utcNow = DateTime.UtcNow;

            long oldStartTicks;
            if (reset)
            {
                oldStartTicks = Interlocked.Exchange(ref this.startTicks, utcNow.Ticks);
            }
            else
            {
                oldStartTicks = this.startTicks;
            }
            return utcNow - new DateTime(oldStartTicks, DateTimeKind.Utc);
        }
    }
}