GrasshopperAsyncComponent/GrasshopperAsyncComponentDemo/SampleImplementations/Sample_UslessCyclesComponent.cs

using Grasshopper.Kernel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using GrasshopperAsyncComponent;

namespace GrasshopperAsyncComponentDemo.SampleImplementations
{
  public class Sample_UselessCyclesAsyncComponent : GH_AsyncComponent
  {
    public override Guid ComponentGuid { get => new Guid("DF2B93E2-052D-4BE4-BC62-90DC1F169BF6"); }

    protected override System.Drawing.Bitmap Icon { get => null; }

    public override GH_Exposure Exposure => GH_Exposure.primary;

    public Sample_UselessCyclesAsyncComponent() : base("Sample Async Component", "CYCLOMATRON-X", "Spins uselessly.", "Samples", "Async")
    {
      BaseWorker = new UselessCyclesWorker();
    }

    protected override void RegisterInputParams(GH_InputParamManager pManager)
    {
      pManager.AddIntegerParameter("N", "N", "Number of spins.", GH_ParamAccess.item);
    }

    protected override void RegisterOutputParams(GH_OutputParamManager pManager)
    {
      pManager.AddTextParameter("Output", "O", "Nothing really interesting.", GH_ParamAccess.item);
    }
  }

  public class UselessCyclesWorker : WorkerInstance
  {
    int MaxIterations { get; set; } = 100;

    public UselessCyclesWorker() : base(null) { }

    public override void DoWork(Action<string, double> ReportProgress, Action Done)
    {
      // Checking for cancellation
      if (CancellationToken.IsCancellationRequested) return;

      for (int i = 0; i <= MaxIterations; i++)
      {
        var sw = new SpinWait();
        for (int j = 0; j <= 100; j++)
          sw.SpinOnce();

        ReportProgress(Id, ((double)(i + 1) / (double)MaxIterations));

        // Checking for cancellation
        if (CancellationToken.IsCancellationRequested) return;
      }

      Done();
    }

    public override WorkerInstance Duplicate() => new UselessCyclesWorker();

    public override void GetData(IGH_DataAccess DA, GH_ComponentParamServer Params)
    {
      if (CancellationToken.IsCancellationRequested) return;

      int _maxIterations = 100;
      DA.GetData(0, ref _maxIterations);
      if (_maxIterations > 1000) _maxIterations = 1000;
      if (_maxIterations < 10) _maxIterations = 10;

      MaxIterations = _maxIterations;
    }

    public override void SetData(IGH_DataAccess DA)
    {
      if (CancellationToken.IsCancellationRequested) return;
      DA.SetData(0, $"Hello world. Worker {Id} has spun for {MaxIterations} iterations.");
    }
  }

}