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Storing list of eobjects before calling xtext validations [message #1851452]

Wed, 06 April 2022 08:08

Yusuf A

Messages: 9
Registered: April 2022

Junior Member

Dear all,
I am very new to xtext. I am working on a xtext project that has so many validations and number of resources (DSLs) is also large.

I have a rule in my grammar called "BlocksRequirement". This can be defined in any DSL of a project. Let's consider I have 10 resources (DSLs) in my project and in 5 of these resources, I have "BlocksRequirement" defined.

This list of "BlocksRequirement" will be used by many validations. So I want to read all the "BlocksRequirement" from all the resources before any validation check is called to avoid reading resources again and again for every validation.

Could you please help me to solve it?

Thanks in advance.

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Re: Storing list of eobjects before calling xtext validations [message #1851473 is a reply to message #1851452]

Wed, 06 April 2022 11:37

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

maybe you can add an adapter to the resourceset you manage yourself (e.g. on first access - trick might be invalidation for open editors)
or you cache on per resource via IResourceScopeCache class.
maybe you can also work with the list in a cheaper way without having an actual list (depends what your actual usecase is - see e.g. UniqueClassNameValidator

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Wed, 06 April 2022 11:38]

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Re: Storing list of eobjects before calling xtext validations [message #1851485 is a reply to message #1851473]

Wed, 06 April 2022 12:48

Rubén Porras Campo

Messages: 67
Registered: July 2009

Member

Hi Yusuf,

we use the adapter in the resource set, as suggested by Christian. Our adapter uses com.avaloq.tools.ddk.xtext/src/com/avaloq/tools/ddk/xtext/resource/IResourceSetCache.java

you can find in the same source code that we use the adapter to cache scoping results.

We have then subclassed org.eclipse.xtext.resource.XtextResourceSet to add one of such adapters to the resource set when it is created (see class ScopeCacheAdapter and CacheConfiguration in same code base).

Something like
public class CustomXtextResourceSet extends XtextResourceSet {
public CustomXtextResourceSet() {
eAdapters().add(new ScopeCacheAdapter(new CacheConfiguration().useSoftValues()));
}
...

To solve the invalidation for open editor, we have disabled the adapter for those editors, but I do not remember now the details of how we did that.

Regards

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Re: Storing list of eobjects before calling xtext validations [message #1851488 is a reply to message #1851485]

Wed, 06 April 2022 13:32

Yusuf A

Messages: 9
Registered: April 2022

Junior Member

Hi Christian,
thanks for the response.
I had a look at https://www.tabnine.com/web/assistant/code/rs/5c6684151095a50001caffb2#L56 for UniqueClassNameValidator. I am sorry but I did not understand it.
My use case after I get a list of eobjects is not complecated. I would like to read all the resources, filter an Eobject "BlocksRequirement" and keep this ready for validations and use it as many times possible.
Could you kindly provide more help on this ?

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Re: Storing list of eobjects before calling xtext validations [message #1851489 is a reply to message #1851488]

Wed, 06 April 2022 13:46

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

the question is: what do you do with that in your validation?

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Storing list of eobjects before calling xtext validations [message #1851492 is a reply to message #1851489]

Wed, 06 April 2022 14:37

Yusuf A

Messages: 9
Registered: April 2022

Junior Member

Let's I am writing a check method for <Requirement>, So when I already have this list<BlocksRequirement> in my validator, I try to find a suitable entry from this list in validation method based on some comparisons. Depending on the results of these comparison I put an error or ignore it.

I currently do like below:

.. List<BlocksRequirement> getAllBlocksReqs(){
        List<BlocksRequirement> reqs= new ArrayList<>(EObject object);
        Resource eResource = object.eContainer().eResource();
        IResourceDescriptions index = resourceDescriptionsProvider.getResourceDescriptions(eResource);
        IResourceDescription iResourceDescription = index.getResourceDescription(eResource.getURI());

        List<IContainer> visibleContainers = containerManager.getVisibleContainers(iResourceDescription, index);
        
        ...iterate over visibleContainers to filter the result and return list.

}

but at the moment I call this method multiple times in my validations. So I was looking for a way to read it once and somehow keep it ready before validations are called. I do not know how to do that.

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