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[Xtext 2.2] Is there a centralized place where I can turn off scope resolution for certain files? [message #793618]

Wed, 08 February 2012 10:55

Alex Ruiz

Messages: 103
Registered: March 2011

Senior Member

Greetings,

Xtext performance has been and continues to be great. We currently have a use case in the protocol buffer editor where a project has a 16k+ lines! (yikes!)...When building a project that contains this file, scope resolution can take a few minutes, even with caching.

We are thinking about adding something like a filter based on file size, similar to what CDT has. CDT's index can ignore files of certain size, in MB (the size is configurable via a preference page.) I looked at Xtext code to see where IScopeProvider is used...and it is used in many, many places.

Is there a centralized place where I can stop scope resolution after checking the size of a file?

Many thanks in advance,
-Alex

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Re: [Xtext 2.2] Is there a centralized place where I can turn off scope resolution for certain files [message #793655 is a reply to message #793618]

Wed, 08 February 2012 11:52

Sebastian Zarnekow

Messages: 3107
Registered: July 2009

Senior Member

Hi Alex,

you could disable proxy resolution in the validator. See
org.eclipse.xtext.validation.ResourceValidatorImpl.validate(Resource,
CheckMode, CancelIndicator)

I won't disable scoping since it is actually triggered on demand (the
validator will resolve all proxies). Having navigation in place is still
handy for bigger files.

If other components rely on resolved proxies (e.g. outline or semantic
coloring), you could guard those as well.

Regards,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 08.02.12 11:55, schrieb Alex Ruiz:
> Greetings,
>
> Xtext performance has been and continues to be great. We currently have
> a use case in the protocol buffer editor where a project has a 16k+
> lines! (yikes!)...When building a project that contains this file, scope
> resolution can take a few minutes, even with caching.
>
> We are thinking about adding something like a filter based on file size,
> similar to what CDT has. CDT's index can ignore files of certain size,
> in MB (the size is configurable via a preference page.) I looked at
> Xtext code to see where IScopeProvider is used...and it is used in many,
> many places.
>
> Is there a centralized place where I can stop scope resolution after
> checking the size of a file?
>
> Many thanks in advance,
> -Alex

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Re: [Xtext 2.2] Is there a centralized place where I can turn off scope resolution for certain files [message #793668 is a reply to message #793655]

Wed, 08 February 2012 12:18

Alex Ruiz

Messages: 103
Registered: March 2011

Senior Member

Thanks Sebastian! I'll be working on it Smile

Cheers,
-Alex

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Re: [Xtext 2.2] Is there a centralized place where I can turn off scope resolution for certain files [message #794093 is a reply to message #793668]

Wed, 08 February 2012 22:52

Alex Ruiz

Messages: 103
Registered: March 2011

Senior Member

Hi Sebastian,

It turns out that when building a project, ClusteringBuilderState.writeNewResourceDescriptions is called before the validator. This constructor CopiedResourceDescription (line 335) triggers scope resolution when creating a copy of the original description (by calling getExportedObjects.)

I've been trying, without success, to override the behaviour in ClusteringBuilderState to ignore the 16k-line file. ClusteringBuilderState is configured in SharedModule and it seems that there is no way to override the binding (unless I'm missing something, which is quite probable.)

Any hints on how to ignore this huge file from building will be greated appreciated Smile

Thanks,
-Alex

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Re: [Xtext 2.2] Is there a centralized place where I can turn off scope resolution for certain files [message #794109 is a reply to message #794093]

Wed, 08 February 2012 23:16

Christian Dietrich

Messages: 13416
Registered: July 2009

Senior Member

Hi,

this (custom bindings for the shared module) is what the extension point org.eclipse.xtext.ui.shared.overridingGuiceModule is for

~Christian

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: [Xtext 2.2] Is there a centralized place where I can turn off scope resolution for certain files [message #794112 is a reply to message #794109]

Wed, 08 February 2012 23:19

Alex Ruiz

Messages: 103
Registered: March 2011

Senior Member

Thanks so much Christian! Crossing fingers that I'm in the right path to solve this issue Smile

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Re: [Xtext 2.2] Is there a centralized place where I can turn off scope resolution for certain files [message #794421 is a reply to message #794112]

Thu, 09 February 2012 09:06

Sebastian Zarnekow

Messages: 3107
Registered: July 2009

Senior Member

Hi Alex,

please keep in mind that the mentioned extension point is only meant to
be used in a closed world, e.g. there can only be exactly one contributor.

Did you try to specialize
org.eclipse.xtext.resource.impl.DefaultResourceDescriptionManager.internalGetResourceDescription(Resource,
IDefaultResourceDescriptionStrategy) and return a lightweight resource
description (e.g. no reference descriptions) in case of large resources?

Regards,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 09.02.12 00:19, schrieb Alex Ruiz:
> Thanks so much Christian! Crossing fingers that I'm in the right path to
> solve this issue :)

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