WindowsProcessCpuUsageProvider.cs

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using System;
using System.Diagnostics;
using Dreamine.Threading.Interfaces;
 
namespace Dreamine.Threading.Windows.Services;

public sealed class WindowsProcessCpuUsageProvider : ICpuUsageProvider, IDisposable
{
    private readonly object _syncRoot = new();
    private readonly Process _process;
    private TimeSpan _lastProcessorTime;
    private DateTimeOffset _lastTimestamp;
    private double _lastCpuUsage;
    private bool _disposed;

    public WindowsProcessCpuUsageProvider()
    {
        _process = Process.GetCurrentProcess();
        _lastProcessorTime = _process.TotalProcessorTime;
        _lastTimestamp = DateTimeOffset.Now;
    }

    public double GetTotalCpuUsagePercent()
    {
        lock (_syncRoot)
        {
            if (_disposed)
            {
                return _lastCpuUsage;
            }
 
            _process.Refresh();
 
            var now = DateTimeOffset.Now;
            var currentProcessorTime = _process.TotalProcessorTime;
 
            var elapsedMs = (now - _lastTimestamp).TotalMilliseconds;
            if (elapsedMs < 200)
            {
                return _lastCpuUsage;
            }
 
            var cpuTimeMs = (currentProcessorTime - _lastProcessorTime).TotalMilliseconds;
 
            var cpuUsage = cpuTimeMs / (elapsedMs * Environment.ProcessorCount) * 100.0;
 
            _lastProcessorTime = currentProcessorTime;
            _lastTimestamp = now;
            _lastCpuUsage = Math.Clamp(cpuUsage, 0, 100);
 
            return _lastCpuUsage;
        }
    }

    public void Dispose()
    {
        lock (_syncRoot)
        {
            if (_disposed)
            {
                return;
            }
 
            _disposed = true;
 
            try
            {
                _process.Dispose();
            }
            catch
            {
                // Suppress on dispose.
            }
        }
    }
}