[vtkusers] VTK/Java crashes -- WeakGlobalRef or garbage collection problem...solution?

[Nathan P Sharp]

Luke Dodd escribió:
> Nathan: Could you explain your suggestion with a
> "vtkJavaGarbageCollectionContext" a little more? Do you think it is
> worth doing if the global lock works?
>
>   
I'll take anything that works and be happy :-)  However, personally I'd
still prefer to have explicit control over it (and would sleep better in
the face of worries about openGL theading restrictions). 

Currently even if I go through and explicitly call Delete() on about
everything I can get my hands on, it is still leaking GDI objects and
memory.  This might be an unrelated issue, I don't know.  Is there
something else I should be doing while closing a vtkCanvas?  DeleteAll()
is not an option because there might be other charts open.

Re: vtkGCContext

I want to get rid of vtkGlobalJavaHash in favor of passing in a
"context" object.  I want to write code like this:

public class MyVTKChart extends JPanel
{
   private vtkCanvas _canvas;
   private vtkObjectContext _context; //this is really just a map

   pubic MyVTKChart()
   {
      _context = new vtkObjectContext();
      _canvas = new vtkCanvas(_context);

      // create sphere geometry
      vtkSphereSource sphere = new vtkSphereSource(_context);
      sphere.SetRadius(1.0);
      sphere.SetThetaResolution(18);
      sphere.SetPhiResolution(18);

      // map to graphics objects
      vtkPolyDataMapper map = new vtkPolyDataMapper(_context);
      //the object returned by sphere.GetOutput() automatically uses
_context
      map.SetInput(sphere.GetOutput());
      ...
   }

   //Clear all vtk resources associated with this class.  Only
   //call after disposing the form
   public void Delete()
   {
      _context.DeleteAll();
   }
   ...

Underneath the hood, vtkObjectContext is exactly like vtkGlobalJavaHash,
only it uses strong references instead of weak.

I really appreciate all your help on this.

  Nathan