How to create a ghost element on a java server?

[madamedefarge]

I can see how ghost elements are created in the Node Workflow example;-

https://github.com/eclipse-glsp/glsp-server-node/blob/948f71ac24366102dbc6b9352f5d10b5777b150b/examples/workflow-server/src/common/handler/create-task-handler.ts#L16

However when I look at the Java workflow example this is not implemented. How do I create a GModelElementSchema on a java server please?

Any are there any examples of creating a ghost element client side? Thanks in advance.

[martin-fleck-at]

I didn't double check this now but I would expect the ghost element to show up even if you use the Java server. You can find the code for in the CreateWorkflowNodeOperationHandler¹

Footnotes

1. https://github.com/eclipse-glsp/glsp-server/blob/474ae6b2356c98015a6dca8c2580cb34d9862dc1/examples/org.eclipse.glsp.example.workflow/src/org/eclipse/glsp/example/workflow/handler/CreateWorkflowNodeOperationHandler.java#L55-L58 ↩

[tortmayr]

However when I look at the Java workflow example this is not implemented. How do I create a GModelElementSchema on a java server please?

On the Java server you don't need to explicitly create a GModelElementSchema. GModelElements are serializable by default, so you can directly use them to construct GhostElements¹ .

Both the base implementation for GModel² & EMF-based³ create node operation handlers have a createTriggerGhostElement(...) method. Simply override this method, create your desired GModel template and return tthe corresponding GhostElement.

Footnotes

1. https://github.com/eclipse-glsp/glsp-server/blob/474ae6b2356c98015a6dca8c2580cb34d9862dc1/plugins/org.eclipse.glsp.server/src/org/eclipse/glsp/server/actions/GhostElement.java#L39 ↩

2. https://github.com/eclipse-glsp/glsp-server/blob/474ae6b2356c98015a6dca8c2580cb34d9862dc1/plugins/org.eclipse.glsp.server/src/org/eclipse/glsp/server/gmodel/GModelCreateNodeOperationHandler.java#L105 ↩

3. https://github.com/eclipse-glsp/glsp-server/blob/474ae6b2356c98015a6dca8c2580cb34d9862dc1/plugins/org.eclipse.glsp.server.emf/src/org/eclipse/glsp/server/emf/EMFCreateOperationHandler.java#L71 ↩

[madamedefarge]

Thank you! That is really helpful.