PerformanceReport.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Text;

namespace SiliconStudio.Core.Diagnostics
{
    public class PerformanceCheckBlock : IDisposable
    {
        private readonly PerformanceReport report;

        public PerformanceCheckBlock(string text, PerformanceReport report)
        {
            if (string.IsNullOrWhiteSpace(text))
                throw new ArgumentException("Invalid 'text' argument");
            if (report == null)
                throw new ArgumentNullException("report");

            this.report = report;
            this.report.BeginMeasure(text);
        }

        public void Dispose()
        {
            report.EndMeasure();
        }
    }

    public class PerformanceReport
    {
        public struct PerformanceReportInfo
        {
            public string Text { get; set; }
            public long Milliseconds { get; set; }
            public long Ticks { get; set; }
        }

        public IEnumerable<PerformanceReportInfo> Measures { get; private set; }

        private readonly List<PerformanceReportInfo> measures = new List<PerformanceReportInfo>();

        private readonly Stopwatch stopwatch = new Stopwatch();
        private string currentMeasureText;

        public PerformanceReport()
        {
            Measures = new ReadOnlyCollection<PerformanceReportInfo>(measures);
        }

        [Conditional("DEBUG")]
        public void BeginMeasure(string text)
        {
            if (currentMeasureText != null)
                EndMeasure();

            currentMeasureText = text;
            stopwatch.Reset();
            stopwatch.Start();
        }

        [Conditional("DEBUG")]
        public void EndMeasure()
        {
            stopwatch.Stop();

            var ticks = stopwatch.ElapsedTicks;
            var ms = stopwatch.ElapsedMilliseconds;

            measures.Add(new PerformanceReportInfo { Text = currentMeasureText, Milliseconds = ms, Ticks = ticks });
            currentMeasureText = null;
        }

        public void Reset()
        {
            measures.Clear();
        }

        public override string ToString()
        {
            var sb = new StringBuilder();

            var totalTicks = measures.Sum(info => info.Ticks);

            foreach (var info in measures)
            {
                sb.AppendLine(string.Format("{0}: {1} ms, {2} ticks ({3:F2}%)",
                    info.Text, info.Milliseconds, info.Ticks, ((double)info.Ticks * 100.0 / (double)totalTicks)));
            }

            return sb.ToString();
        }
    }
}