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Modifying a separate Ecore file outside Create-Features [message #662421]

Wed, 30 March 2011 11:36

Eclipse User

Hello again,

I have recently tried to create new EObjects outside of a CreateFeature but eventually failed in many cases due to a concurrent write. Strangely, this has also been happening when e.g. working with a wizard.

I am able to create EObjects, but when trying to save the files in my resource set, I am getting the following error:

URI: platform:/resource/BPMNtest/new_file.bpmn2, cause: 
java.lang.IllegalStateException: Cannot modify resource set without a write transaction
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.assertWriting(TransactionChangeRecorder.java:348)
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.appendNotification(TransactionChangeRecorder.java:302)
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.processObjectNotification(TransactionChangeRecorder.java:284)
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.notifyChanged(TransactionChangeRecorder.java:240)
...

I can neither modify the resource by executing a Command on the CommandStack nor can I achieve my goal without a Command.
I don't really have a clue on how to solve the problem, but I hope that you can help me.

Best Regards
Rainer

Re: Modifying a separate Ecore file outside Create-Features [message #662424 is a reply to message #662421]

Wed, 30 March 2011 11:39

Eclipse User

Rainer, can you give an example of your code both using and not using Command? Also, where is your code triggered? Is this through a Graphiti feature?

Jos

Re: Modifying a separate Ecore file outside Create-Features [message #662429 is a reply to message #662421]

Wed, 30 March 2011 11:56

Eclipse User

Hi!

This is my code (using a RecordingCommand):

final BpmnDiagramEditor editor = (BpmnDiagramEditor) Util
	.getActiveEditor();
TransactionalEditingDomain domain = editor.getEditingDomain();
ResourceSet set = domain.getResourceSet();
set.getResourceFactoryRegistry().getExtensionToFactoryMap()
	.put("wsdl", new WSDLResourceFactoryImpl());
Resource r = null;

r = set.createResource(URI.createURI(page.getFilePath()
	.replaceAll("\\\\", "/")
	.replace(Platform.getLocation().toString(), "")));

try {
	r.load(Collections.EMPTY_MAP);
} catch (IOException e) {
	return false;
}

r.setModified(false);
editor.getImportUtil().addResource(r, Util.PORTTYPES);
final List<EObject> objs = editor.getImportUtil()
	.getObjectsForResource(r);

Definitions def = null;
for (Resource res : set.getResources()) {
	if (res.getURI().fileExtension().equals("bpmn2")) {
		def = ((DocumentRoot) res.getContents().get(0))
			.getDefinitions();
		break;
	}
}

final Definitions finalDef = def;
domain.getCommandStack().execute(new RecordingCommand(domain) {
			
@Override
protected void doExecute() {
	for (EObject eObject : objs) {
		Interface iface = Bpmn2Factory.eINSTANCE.createInterface();
		iface.setId(EcoreUtil.generateUUID());
		iface.setImplementationRef(eObject);
		for (Operation op : (EList<Operation>) ((PortType) eObject)
				.getEOperations()) {
			org.eclipse.bpmn2.Operation newOp = Bpmn2Factory.eINSTANCE
					.createOperation();
			newOp.setImplementationRef(op);
			iface.getOperations().add(newOp);
		}
		finalDef.getRootElements().add(iface);
	}
}
});

The code is called inside a "performFinish()" method of a Jface Wizard. The Exception does not occur inside that code piece, but when I am saving the diagram.

Best Regards
Rainer

[Updated on: Wed, 30 March 2011 11:56] by Moderator

Re: Modifying a separate Ecore file outside Create-Features [message #662637 is a reply to message #662421]

Thu, 31 March 2011 07:35

Eclipse User

Okay, I managed to resolve the problem myself. It was not a problem of Graphiti itself but of the BPMN2 Metamodel, which I am using. It automatically tries to add an ID to all its elements, if the ID was not set before. This interferes with the save process initiated by the EmfService used by Graphiti. I should have known that, because I already experienced the error before, I just forgot about it.

Thanks for your time and sorry, that I kind of wasted it Embarrassed

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