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Database

We now create the metamodel and persist three variants with Spring Data CDO:

  • /drone the drone part
  • /var the variable space part
  • /composed a composed bigraph (drone + var space)

The important point is: we keep track of the CDOIDs so we can re-load and rewrite only parts later.

private void prepareDatabase() throws Exception {
    DynamicSignature sig = sig();
    EPackage MM = createOrGetBigraphMetaModel(sig);

    EPackage.Registry.INSTANCE.put(MM.getNsURI(), MM);
    CDOPackageRegistry.INSTANCE.put(MM.getNsURI(), MM);
    template.getCDOPackageRegistry().put(MM.getNsURI(), MM);

    template.removeAll("/drone");
    template.removeAll("/var");
    template.removeAll("/composed");
}

Then insert the three initial models:

final EPackage MM = createOrGetBigraphMetaModel(sig());
PureBigraph dronePartInit = droneModel();
PureBigraph varPartInit   = varModel();
PureBigraph compositeInit = merge(dronePartInit, varPartInit, true);

// store in CDO under three roots
dronePartInit = toBigraph(MM, template.insert(dronePartInit.getInstanceModel(), "/drone"), sig());
varPartInit   = toBigraph(MM, template.insert(varPartInit.getInstanceModel(), "/var"), sig());
compositeInit = toBigraph(MM, template.insert(compositeInit.getInstanceModel(), "/composed"), sig());

// remember IDs so we can reload and overwrite them
CDOID cdoIdDrone = CDOUtil.getCDOObject(dronePartInit.getInstanceModel()).cdoID();
CDOID cdoIdVar   = CDOUtil.getCDOObject(varPartInit.getInstanceModel()).cdoID();

The method merge() composes the two bigraphs, closing the shared outer name eref if requested.