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Multiple xtext DSL projects in one workspace [message #1842198]

Fri, 11 June 2021 13:43

Juewei Jin

Messages: 17
Registered: July 2009

Junior Member

In the Java world, we can add multiple Java maven projects in one Eclipse workspace, and define the dependencies between them in the pom.xml file.
Is it possible to do this similarly for xtext DSL project too?

I got this idea is because our xtext DSL projects getting bigger and bigger. What we are doing now is under the root folder created many sub folders and put our DSLs in corresponding sub folders. The DSL models in different sub folders have dependencies between them. Now the build time takes too long. We are thinking about to divide the single DSL project into multiple sub projects. I know it is possible to add multiple projects in one workspace, when they are independent to each other. Is it possible to add multiple projects in one workspace, which are dependent to each other?

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Re: Multiple xtext DSL projects in one workspace [message #1842199 is a reply to message #1842198]

Fri, 11 June 2021 13:45

Christian Dietrich

Messages: 14497
Registered: July 2009

Senior Member

hi, this works out of the box. simply use either project references or like in maven have java projects with dependencies to each other

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Re: Multiple xtext DSL projects in one workspace [message #1842215 is a reply to message #1842199]

Sat, 12 June 2021 06:35

Ed Willink

Messages: 7595
Registered: July 2009

Senior Member

Hi

With multiple DSLs, you may find it helpful to refactor all the build support (*.mwe2) into a separate plugin so that your DSL plugins have significantly reduced dependencies.

See the one https://git.eclipse.org/r/plugins/gitiles/ocl/org.eclipse.ocl/+/refs/heads/master/examples/org.eclipse.ocl.examples.build/
and five variants of https://git.eclipse.org/r/plugins/gitiles/ocl/org.eclipse.ocl/+/refs/heads/master/plugins/org.eclipse.ocl.xtext.oclinecore/
for an example.

Regards

Ed Willink

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Re: Multiple xtext DSL projects in one workspace [message #1842488 is a reply to message #1842199]

Mon, 21 June 2021 15:25

Juewei Jin

Messages: 17
Registered: July 2009

Junior Member

hi Christian,
thanks for your suggestion.
we need to save the dependencies in Git, so that all users can share the dependencies between DSL model projects. (Here not the DSL language projects, but the DSL artifact/model projects, which contains the DSL models using the DSL language.)
With the first option using "project references ", the dependencies are saved in eclipse workspace. I think it is difficult to share the dependencies with other users. If I'm wrong, please correct me.
With the second option "like in maven have java projects with dependencies to each other", I don't understand what exactly do you mean. Do you mean that we can create maven project and use pom.xml to save the dependencies between DSL projects?

[Updated on: Mon, 21 June 2021 15:41]

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Re: Multiple xtext DSL projects in one workspace [message #1842493 is a reply to message #1842488]

Mon, 21 June 2021 16:25

Christian Dietrich

Messages: 14497
Registered: July 2009

Senior Member

yes. the same as you would to with java code and maven.

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

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Re: Multiple xtext DSL projects in one workspace [message #1842697 is a reply to message #1842493]

Tue, 29 June 2021 10:00

Juewei Jin

Messages: 17
Registered: July 2009

Junior Member

Hi Christian,
I tried both ways, using the project reference and using maven pom.xml to define the DSL model project dependencies. Both of them works fine within eclipse.
But it seems that the standalone mode supports neither of them.
For example, I have DSL model project A and B, where the project B depends on project A. When I use standalone mode to run project B, it could not find the models in project A.
Do I need to do additional steps for the standalone mode?

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Re: Multiple xtext DSL projects in one workspace [message #1842701 is a reply to message #1842697]

Tue, 29 June 2021 11:06

Christian Dietrich

Messages: 14497
Registered: July 2009

Senior Member

what do you mean by standalone support /mode?
if you read files by hand, then of course you have to do this by hand as well.
you may check how the lsp impl deal with projects

Need professional support for Xtext, Xpand, EMF?
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Blog : https://www.dietrich-it.de

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