[Paraview] Reader ctors called multiple times?

[David E DeMarle]

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> 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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