How to make changes in the backend in the coffee editor model

[glsp-bot]

Coming from another discussion , I was able to add changes to the frontend to create a new component to the coffee editor model. I am able to access the model server APIs from the modelserver repo.
Is there a way I can make changes or add new components in the model.
Thanks in advance.

original thread by josephanand16

[eneufeld]

Hi,
I created this wiki page: https://github.com/eclipsesource/coffee-editor/wiki/How-to-modify-the-model-used-by-the-ModelServer
If something is unclear let us know.

[glsp-bot]

[josephanand16]

Hi Eugen,

Thanks for wiki and the tutorial.
It helped me understand many things. However there are a few things I need to understand.

1. Does the api from modelserver/CoffeePackageConfiguration.java fetch the nsURIs from the model Server that is running as an executable in the background?

2. In the point you mentioned about 'Registering a model'. Where does the registry actually take place? Is it in the (emfcloud-modelserver/examples/org.eclipse.emfcloud.modelserver.example/pom.xml)?

3. Since the model server is using this ecore model :
   emfcloud-modelserver/examples/org.eclipse.emfcloud.modelserver.coffee.model/src/main/resources/Coffee.ecore
   Can simply making changes to this model or adding your own custom model and then, building and running the modelserver as an executable be sufficient for modifications in the backend?

4. As you mentioned in the wiki about a 'bundle with your model'. Do i need to build my model as jar? if yes do i then need to copy it to a place in the coffee editor model or is it going to be a part of the model server?

Thanks
Joseph

[glsp-bot]

[josephanand16]

Hi Eugen,
Thanks again for the wiki.
Any kind of resource to help me answer these questions would be a massive help.
Thanks

[eneufeld]

Hi, sorry I missed the questions.

1 The ModelServer is started from /com.eclipsesource.coffee.modelserver/src/main/com/eclipsesource/coffee/modelserver/CoffeeModelServerLauncher.java so the nsURI must be known in the JavaApplication, usually by you providing an ecore bundle. In the case of the coffee editor this is done by the maven dependency:

```<dependency>
 <groupId>com.eclipsesource.modelserver</groupId>
 <artifactId>com.eclipsesource.modelserver.coffee.model</artifactId>
 <version>0.7.0-SNAPSHOT</version>
</dependency>```

2 the registry is done in the ecore bundle, for the coffee model here https://github.com/eclipsesource/coffee-editor/blob/49e0822e5cd5bc48645f08b2706a95ee1f3980a2/backend/plugins/com.eclipsesource.coffee.modelserver/src/main/com/eclipsesource/coffee/modelserver/CoffeePackageConfiguration.java#L35
Usually EMF models are registered via a plugin.xml, but as we don't have an eclipse product here, we need to explicitly call the eClass so that internally this model is made known to the EMF Registry. I recommend that you check the EMF tutorial: https://eclipsesource.com/blogs/tutorials/emf-tutorial/ as understanding the basics of EMF is crucial for the modelserver and especially GLSP.
3 As described in 1, you should create a custom project for your custom model, and then add a dependency to it to the com.eclipsesource.coffee.modelserver project in the PacakgeConfiguration. By doing so the modelserver will provide GLSP and the Tree editor with data corresponding to this model.
In GLSP you will need to update the model dependency in com.eclipsesource.workflow.glsp.server for the tree you need to update the json schema as discussed in the other topic.
4 So you need a project which contains your ecore and the generated code. This project must be available to the om.eclipsesource.coffee.modelserver . The model must also be available to the com.eclipsesource.workflow.glsp.server .
The example coffee model project can be found here: https://github.com/eclipse-emfcloud/emfcloud-modelserver/tree/master/examples/org.eclipse.emfcloud.modelserver.coffee.model

[glsp-bot]

[josephanand16]

Thanks alot!