fix: Bump version

Downgraded rhino nugets to 6.28 for broader compatibility

.circleci/config.yml

@@ -16,7 +16,7 @@ jobs:
           command: msbuild GrasshopperAsyncComponent.sln /p:Configuration=Release
       - run:
           name: Pack NuGet
-          command: cd GrasshopperAsyncComponent; nuget pack GrasshopperAsyncComponent.csproj -Prop Configuration=Release
+          command: cd GrasshopperAsyncComponent; nuget pack GrasshopperAsyncComponent.csproj -Prop Configuration=Release -Symbols -SymbolPackageFormat snupkg
       - run:
           name: Push NuGet
           command: cd GrasshopperAsyncComponent; nuget push *.nupkg -Source https://api.nuget.org/v3/index.json -ApiKey $env:NUGET_AUTH_TOKEN -SkipDuplicate

GrasshopperAsyncComponent/GH_AsyncComponent.cs

@@ -1,10 +1,11 @@
-using System;
+using Grasshopper.Kernel;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
-using Grasshopper.Kernel;
 using Timer = System.Timers.Timer;
 
 namespace GrasshopperAsyncComponent
@@ -21,14 +22,14 @@ namespace GrasshopperAsyncComponent
     Action<string, double> ReportProgress;
 
     public ConcurrentDictionary<string, double> ProgressReports;
-    
+
     Action Done;
 
     Timer DisplayProgressTimer;
 
     int State = 0;
 
-    bool SetData = false;
+    int SetData = 0;
 
     public List<WorkerInstance> Workers;
 
@@ -55,16 +56,19 @@ namespace GrasshopperAsyncComponent
       ReportProgress = (id, value) =>
       {
         ProgressReports[id] = value;
-        if (!DisplayProgressTimer.Enabled) DisplayProgressTimer.Start();
+        if (!DisplayProgressTimer.Enabled)
+        {
+          DisplayProgressTimer.Start();
+        }
       };
 
       Done = () =>
       {
-        State++;
-
-        if (State == Workers.Count)
+        Interlocked.Increment(ref State);
+        if (State == Workers.Count && SetData == 0)
         {
-          SetData = true;
+          Interlocked.Exchange(ref SetData, 1);
+
           // We need to reverse the workers list to set the outputs in the same order as the inputs. 
           Workers.Reverse();
 
@@ -84,7 +88,11 @@ namespace GrasshopperAsyncComponent
 
     public virtual void DisplayProgress(object sender, System.Timers.ElapsedEventArgs e)
     {
-      if (Workers.Count == 0) return;
+      if (Workers.Count == 0 || ProgressReports.Values.Count == 0)
+      {
+        return;
+      }
+
       if (Workers.Count == 1)
       {
         Message = ProgressReports.Values.Last().ToString("0.00%");
@@ -108,39 +116,52 @@ namespace GrasshopperAsyncComponent
 
     protected override void BeforeSolveInstance()
     {
-      if (State != 0 && SetData) return;
+      if (State != 0 && SetData == 1)
+      {
+        return;
+      }
 
-      foreach (var source in CancellationSources) source.Cancel();
+      Debug.WriteLine("Killing");
+
+      foreach (var source in CancellationSources)
+      {
+        source.Cancel();
+      }
 
       CancellationSources.Clear();
       Workers.Clear();
       ProgressReports.Clear();
       Tasks.Clear();
 
-      State = 0;
-
-      //var test = Params.Output[0].VolatileData;
+      Interlocked.Exchange(ref State, 0);
     }
 
     protected override void AfterSolveInstance()
     {
+      System.Diagnostics.Debug.WriteLine("After solve instance was called " + State + " ? " + Workers.Count);
       // We need to start all the tasks as close as possible to each other.
-      if (State == 0 && Tasks.Count > 0)
+      if (State == 0 && Tasks.Count > 0 && SetData == 0)
       {
-        foreach (var task in Tasks) task.Start();
-        //var test = Params.Output[0].VolatileData;
+        System.Diagnostics.Debug.WriteLine("After solve INVOKATIONM");
+        foreach (var task in Tasks)
+        {
+          task.Start();
+        }
       }
     }
 
     protected override void ExpireDownStreamObjects()
     {
       // Prevents the flash of null data until the new solution is ready
-      if (SetData)
+      if (SetData == 1)
+      {
         base.ExpireDownStreamObjects();
+      }
     }
 
     protected override void SolveInstance(IGH_DataAccess DA)
     {
+      //return;
       if (State == 0)
       {
         if (BaseWorker == null)
@@ -164,13 +185,13 @@ namespace GrasshopperAsyncComponent
         currentWorker.CancellationToken = tokenSource.Token;
         currentWorker.Id = $"Worker-{DA.Iteration}";
 
-        var currentRun = TaskCreationOptions != null 
-          ? new Task(() => currentWorker.DoWork(ReportProgress, Done), tokenSource.Token, (TaskCreationOptions)TaskCreationOptions) 
+        var currentRun = TaskCreationOptions != null
+          ? new Task(() => currentWorker.DoWork(ReportProgress, Done), tokenSource.Token, (TaskCreationOptions)TaskCreationOptions)
           : new Task(() => currentWorker.DoWork(ReportProgress, Done), tokenSource.Token);
-        
+
         // Add cancellation source to our bag
         CancellationSources.Add(tokenSource);
-        
+
         // Add the worker to our list
         Workers.Add(currentWorker);
 
@@ -179,22 +200,50 @@ namespace GrasshopperAsyncComponent
         return;
       }
 
-      if (!SetData) return;
-      
-      if (Workers.Count > 0)
-        Workers[--State].SetData(DA);
+      if (SetData == 0)
+      {
+        return;
+      }
+
+      if (Workers.Count > 0)
+      {
+        Interlocked.Decrement(ref State);
+        Workers[State].SetData(DA);
+      }
+
+      if (State != 0)
+      {
+        return;
+      }
 
-      if (State != 0) return;
-      
       CancellationSources.Clear();
       Workers.Clear();
       ProgressReports.Clear();
       Tasks.Clear();
 
-      SetData = false;
+      Interlocked.Exchange(ref SetData, 0);
 
       Message = "Done";
       OnDisplayExpired(true);
     }
+
+    public void RequestCancellation()
+    {
+      foreach (var source in CancellationSources)
+      {
+        source.Cancel();
+      }
+
+      CancellationSources.Clear();
+      Workers.Clear();
+      ProgressReports.Clear();
+      Tasks.Clear();
+
+      Interlocked.Exchange(ref State, 0);
+      Interlocked.Exchange(ref SetData, 0);
+      Message = "Cancelled";
+      OnDisplayExpired(true);
+    }
+
   }
 }

GrasshopperAsyncComponent/GrasshopperAsyncComponent.csproj

@@ -13,6 +13,10 @@
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
   </PropertyGroup>
+  <PropertyGroup>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
     <DebugSymbols>true</DebugSymbols>
@@ -45,10 +49,12 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Grasshopper">
-      <Version>6.29.20238.11501</Version>
+      <Version>6.28.20199.17141</Version>
+      <IncludeAssets>compile; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="RhinoCommon">
-      <Version>6.29.20238.11501</Version>
+      <Version>6.28.20199.17141</Version>
+      <IncludeAssets>compile; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

GrasshopperAsyncComponent/GrasshopperAsyncComponent.nuspec

@@ -2,15 +2,14 @@
 <package >
   <metadata>
     <id>GrasshopperAsyncComponent</id>
-    <version>0.2.0.0</version>
+    <version>1.2.3.0</version>
     <title>GrasshopperAsyncComponent</title>
     <authors>Speckle Systems</authors>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <license type="expression">Apache-2.0</license>
     <projectUrl>https://github.com/specklesystems/GrasshopperAsyncComponent</projectUrl>
-    <iconUrl>http://icon_url_here_or_delete_this_line/</iconUrl>
     <description>Jankless Grasshopper Component</description>
-    <releaseNotes>Initial release.</releaseNotes>
+    <releaseNotes>Adds cancellation methods.</releaseNotes>
     <copyright>Speckle Systems</copyright>
     <tags>grasshopper rhino mcneel gh_component</tags>
   </metadata>

GrasshopperAsyncComponent/Properties/AssemblyInfo.cs

@@ -9,7 +9,7 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("Speckle Systems")]
 [assembly: AssemblyProduct("GrasshopperAsyncComponent")]
-[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyCopyright("Copyright AEC Systems © 2020, 2021")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
@@ -31,5 +31,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: AssemblyVersion("1.2.3.0")]
+[assembly: AssemblyFileVersion("1.2.3.0")]

GrasshopperAsyncComponentDemo/GrasshopperAsyncComponentDemo.csproj

@@ -55,8 +55,8 @@
     <Compile Include="SampleImplementations\Sample_UslessCyclesComponent.cs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Grasshopper" Version="6.29.20238.11501" />
-    <PackageReference Include="RhinoCommon" Version="6.29.20238.11501" />
+    <PackageReference Include="Grasshopper" Version="6.28.20199.17141" />
+    <PackageReference Include="RhinoCommon" Version="6.28.20199.17141" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\GrasshopperAsyncComponent\GrasshopperAsyncComponent.csproj">

GrasshopperAsyncComponentDemo/SampleImplementations/Sample_PrimeCalculatorAsyncComponent.cs

@@ -6,6 +6,7 @@ using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using GrasshopperAsyncComponent;
+using System.Windows.Forms;
 
 namespace GrasshopperAsyncComponentDemo.SampleImplementations
 {
@@ -30,7 +31,15 @@ namespace GrasshopperAsyncComponentDemo.SampleImplementations
     protected override void RegisterOutputParams(GH_OutputParamManager pManager)
     {
       pManager.AddNumberParameter("Output", "O", "The n-th prime number.", GH_ParamAccess.item);
+    }
 
+    public override void AppendAdditionalMenuItems(ToolStripDropDown menu)
+    {
+      base.AppendAdditionalMenuItems(menu);
+      Menu_AppendItem(menu, "Cancel", (s, e) =>
+      {
+        RequestCancellation();
+      });
     }
   }
 
@@ -44,7 +53,7 @@ namespace GrasshopperAsyncComponentDemo.SampleImplementations
     public override void DoWork(Action<string, double> ReportProgress, Action Done)
     {
       // 👉 Checking for cancellation!
-      if (CancellationToken.IsCancellationRequested) return;
+      if (CancellationToken.IsCancellationRequested) { return; }
 
       int count = 0;
       long a = 2;
@@ -53,14 +62,14 @@ namespace GrasshopperAsyncComponentDemo.SampleImplementations
       while (count < TheNthPrime)
       {
         // 👉 Checking for cancellation!
-        if (CancellationToken.IsCancellationRequested) return;
+        if (CancellationToken.IsCancellationRequested) {  return; }
 
         long b = 2;
         int prime = 1;// to check if found a prime
         while (b * b <= a)
         {
           // 👉 Checking for cancellation!
-          if (CancellationToken.IsCancellationRequested) return;
+          if (CancellationToken.IsCancellationRequested) {return; }
 
           if (a % b == 0)
           {
@@ -98,7 +107,7 @@ namespace GrasshopperAsyncComponentDemo.SampleImplementations
     public override void SetData(IGH_DataAccess DA)
     {
       // 👉 Checking for cancellation!
-      if (CancellationToken.IsCancellationRequested) return;
+      if (CancellationToken.IsCancellationRequested) { return; }
 
       DA.SetData(0, ThePrime);
     }

GrasshopperAsyncComponentDemo/SampleImplementations/Sample_UslessCyclesComponent.cs

@@ -6,6 +6,7 @@ using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using GrasshopperAsyncComponent;
+using System.Windows.Forms;
 
 namespace GrasshopperAsyncComponentDemo.SampleImplementations
 {
@@ -31,6 +32,15 @@ namespace GrasshopperAsyncComponentDemo.SampleImplementations
     {
       pManager.AddTextParameter("Output", "O", "Nothing really interesting.", GH_ParamAccess.item);
     }
+
+    public override void AppendAdditionalMenuItems(ToolStripDropDown menu)
+    {
+      base.AppendAdditionalMenuItems(menu);
+      Menu_AppendItem(menu, "Cancel", (s, e) =>
+      {
+        RequestCancellation();
+      });
+    }
   }
 
   public class UselessCyclesWorker : WorkerInstance
@@ -42,7 +52,7 @@ namespace GrasshopperAsyncComponentDemo.SampleImplementations
     public override void DoWork(Action<string, double> ReportProgress, Action Done)
     {
       // Checking for cancellation
-      if (CancellationToken.IsCancellationRequested) return;
+      if (CancellationToken.IsCancellationRequested) { return; }
 
       for (int i = 0; i <= MaxIterations; i++)
       {
@@ -53,7 +63,7 @@ namespace GrasshopperAsyncComponentDemo.SampleImplementations
         ReportProgress(Id, ((double)(i + 1) / (double)MaxIterations));
 
         // Checking for cancellation
-        if (CancellationToken.IsCancellationRequested) return;
+        if (CancellationToken.IsCancellationRequested) { return; }
       }
 
       Done();

README.md

@@ -15,14 +15,15 @@ Looks nice, doesn't it? Notice that the solution runs "eagerly" - every time the
 
 - **Grasshopper and Rhino are still responsive!**
 - **There's progress reporting!** (personally I hate waiting for Gh to unfreeze...).
+- **Thread safe**: 99% of the times this won't explode in your face. It still might though!
 
 ### Approach
 
 Provides an abstract `GH_AsyncComponent` which you can inherit from to scaffold your own async component. There's more info in the [blogpost](https://speckle.systems/blog/async-gh/) on how to go about it.
 
-Even better, there's a [sample component that shows how an implementation could look like](https://github.com/specklesystems/GrasshopperAsyncComponent/tree/main/GrasshopperAsyncComponent/SampleImplementations)! There's two components in that folder:
-- The Useless Spinner: does no meaningfull CPU work, just keeps a thread busy with SpinWait()
-- The N-th Prime Calculator: can actually spin your computer's fans quite a bit (for numbers > 100.000) 
+> #### Checkout the sample implementation! 
+> - [Prime number calculator](https://github.com/specklesystems/GrasshopperAsyncComponent/blob/a53cef31a8750a18d06fad0f41b2dc452fdc253b/GrasshopperAsyncComponentDemo/SampleImplementations/Sample_PrimeCalculatorAsyncComponent.cs#L11-L53) Calculates the n'th prime. Can actually spin your computer's fans quite a bit for numbers > 100.000!
+> - [Usless spinner](https://github.com/specklesystems/GrasshopperAsyncComponent/blob/2f2be53bffd2402337ba40d65bb5b619d1161b3e/GrasshopperAsyncComponentDemo/SampleImplementations/Sample_UslessCyclesComponent.cs#L13-L91) does no meaningfull CPU work, just keeps a thread busy with SpinWait().
 
 ### Current limitations
 
@@ -46,6 +47,25 @@ Q: Does this component use all my cores? A: OH YES. It goes WROOOM.
 
 ![image](https://user-images.githubusercontent.com/7696515/95597125-29310900-0a46-11eb-99ce-663b34506a7a.png)
 
+Q: Can I enable cancellation of a longer running task? 
+
+A: Yes, now you can! In your component, just add a right click menu action like so:
+
+```cs
+
+    public override void AppendAdditionalMenuItems(ToolStripDropDown menu)
+    {
+      base.AppendAdditionalMenuItems(menu);
+      Menu_AppendItem(menu, "Cancel", (s, e) =>
+      {
+        RequestCancellation();
+      });
+    }
+
+```
+
+
+
 ### Debugging
 
 Quite easy: