[Paraview] Reader ctors called multiple times?

[Vanmoer, Mark W]

Thanks guys, I had to put this aside for a week. For the “constructor being called three times case” there’re some things in the backtraces for the first two that might be it.

The first has a call to vtkSMReaderFactory::GetReaders, also, both have calls to CanReadFile, but not from the plugin, from vtkSMReaderFactory. I should be seeing the plugin’s CanReadFile method, right?



From: David E DeMarle [mailto:dave.demarle at kitware.com]
Sent: Tuesday, August 05, 2014 10:02 AM
To: Burlen Loring
Cc: Vanmoer, Mark W; paraview
Subject: Re: [Paraview] Reader ctors called multiple times?

Burlen's got it right. I am curious why the plugin was only called once. Maybe there is no CanReadFile() or no file extension collision of something like that in one case but not the other?

Mark: ProcessRequest() calls RDO(), RI(), and RD() (in that order) only after paraview creates the instance that it will actually use to read the file with. All are typically only called once, unless some parameter on the reader changes. If RD is called more often check to see if image based extents are mismatched.


David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Mon, Aug 4, 2014 at 5:38 PM, Burlen Loring <bloring at lbl.gov<mailto:bloring at lbl.gov>> wrote:
I thought it was twice. The first one ParaView when creates the reader to call CanReadFile in its search for potential readers of the file. The second one when it builds the pipeline.

On 08/04/2014 02:31 PM, Vanmoer, Mark W wrote:
Ah, is it because the exeutive’s ProcessRequest is doing all three of REQUEST_DATA, REQUEST_INFORMATION, and REQUEST_DATA_OBJECT ?

From: Vanmoer, Mark W
Sent: Monday, August 04, 2014 4:04 PM
To: paraview
Subject: Reader ctors called multiple times?

Hello ParaView,

I’ve inherited a project that writes plugins for ParaView 3.14.1, serial. While debugging I found out that the constructor for one of this project’s file readers is called 3 times when loading a file. I thought this was odd, so I tried setting a break point on vtkUnstructuredGridReader’s ctor and discovered that it’s called twice. However, a constructor for vtk source plugin that I wrote is only called once, as I would have guessed for the others.

Is it normal for readers to have their constructors called multiple times when loading a file?

Thanks,
Mark




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