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Concurrently modifying position in an IDocument [message #494016]

Wed, 28 October 2009 19:21

Mirko Seifert

Messages: 31
Registered: July 2009

Member

Hi,

I have a custom TextEditor and I need to modify the positions of the
underlying org.eclipse.jface.text.IDocument concurrently. I use:

....
document.addPositionCategory(category);
org.eclipse.jface.text.Position position = new
org.eclipse.jface.text.Position(offset, length);
document.addPosition(category, position);

This works fine most of the time, but sometimes, when the document is
accessed by other thread I get ConcurrentModificationExceptions. This is
for example the case when the
org.eclipse.jface.text.source.AnnotationRulerColumn redraws itself.

My question is: How can I make sure, that the position are only added at
correct points in time? Can I lock the IDocument somehow? Do I have to
do the changes in a particular thread, so SWT makes sure there is no
other accesses to the list of positions?

I'm working on Galileo.

Thanks in advance.

Mirko

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Re: Concurrently modifying position in an IDocument [message #495043 is a reply to message #494016]

Tue, 03 November 2009 15:50

Grant Gayed

Messages: 2150
Registered: July 2009

Senior Member

You may get more response if you ask this on the eclipse.platform.jface
newsgroup.

Grant

"Mirko Seifert" <mirko.seifert@tu-dresden.de> wrote in message
news:hca5k3$9lm$1@build.eclipse.org...
> Hi,
>
> I have a custom TextEditor and I need to modify the positions of the
> underlying org.eclipse.jface.text.IDocument concurrently. I use:
>
> ...
> document.addPositionCategory(category);
> org.eclipse.jface.text.Position position = new
> org.eclipse.jface.text.Position(offset, length);
> document.addPosition(category, position);
>
> This works fine most of the time, but sometimes, when the document is
> accessed by other thread I get ConcurrentModificationExceptions. This is
> for example the case when the
> org.eclipse.jface.text.source.AnnotationRulerColumn redraws itself.
>
> My question is: How can I make sure, that the position are only added at
> correct points in time? Can I lock the IDocument somehow? Do I have to
> do the changes in a particular thread, so SWT makes sure there is no
> other accesses to the list of positions?
>
> I'm working on Galileo.
>
> Thanks in advance.
>
> Mirko

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