Save Correspondence Model Delta-Based

[h4uges]

#585 delta-based peristence of the models contained in the ResourceRepositoryImpl was introduced. As next step also the PersistableCorrespondenceModel should be persisted delta-based.

Tasks/Hints:

• in PersistableCorrespondenceModelImpl use a delta-based correspondenceResource (use a ResourceSet that uses DeltaBasedResources) (see [1])
• the current implementation loads the CorrenspondenceModel and resolves its references later with the loaded models (loadSerializedCorrespondences). As the corrensondence-model shall be saved delta-based the implementation attempts to resolve the references during the application of the deltas. This leads to errors, as the references are unknown. Therefore a different mechanism is needed. Possible approaches:
  • store external references as proxies ("LazyIdResolver") and allow Proxies during application of changes ("LazyResolveAndApply")
  • use a common ResourceSet for models and correspondence model
  • ...

[1]

private static ResourceSet createDeltaBasedResourceSet() {
	ResourceSet resourceSet = withGlobalFactories(new ResourceSetImpl());
	resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("*", new DeltaBasedResourceFactory());
	return resourceSet;
}