public static void main(String[] args) {
KMetaModel metaModel = new MetaModel("SmartCityMetaModel");
KMetaClass metaClassCity = metaModel.addMetaClass("City");
KMetaClass metaClassDistrict = metaModel.addMetaClass("District");
metaClassCity.addAttribute("name", KPrimitiveTypes.STRING);
metaClassDistrict.addAttribute("name", KPrimitiveTypes.STRING);
metaClassDistrict.addAttribute("nbcitizen", KPrimitiveTypes.LONG);
// create the reference districts from City to district with multiplicity 0..*
metaClassCity.addRelation("districts", metaClassDistrict, null);
KModel model =
metaModel.createModel(
DataManagerBuilder.create().withScheduler(new DirectScheduler()).build());
model.connect(
o -> {
// Create reflexively a model object using the metaClass name
KObject city = model.createByName("City", BASE_UNIVERSE, BASE_TIME);
city.setByName("name", "MySmartCity");
// Create reflexively a model object using the metaClass
KObject district_1 = model.create(metaClassDistrict, BASE_UNIVERSE, BASE_TIME);
district_1.setByName("name", "District_1");
district_1.setByName("nbcitizen", 10000);
// Create reflexively a model object using the metaClass
KObject district_2 = model.createByName("District", BASE_UNIVERSE, BASE_TIME);
district_2.setByName("name", "District_2");
district_2.setByName("nbcitizen", 50000);
// Add the two district to the City
city.addByName("districts", district_1);
city.addByName("districts", district_2);
// Save the full model as JSON in the console
model.universe(BASE_UNIVERSE).time(BASE_TIME).json().save(city, System.out::println);
// Visiting all reachable objects from the city
city.visit(
elem -> {
System.out.println("Visiting..." + elem.toJSON());
return KVisitResult.CONTINUE;
},
o1 -> System.out.println("End of the visit"));
// Visiting all attributes of an object
city.visitAttributes(
(metaAttribute, value) -> {
System.out.println(
"City attribute "
+ metaAttribute.metaName()
+ ", type="
+ metaAttribute.attributeTypeId()
+ "="
+ value);
});
// Finally any object have a UUID and can be retrieve from it
long cityUUID = city.uuid();
System.out.println("City uuid=" + cityUUID);
model.lookup(
BASE_UNIVERSE,
BASE_TIME,
cityUUID,
new KCallback<KObject>() {
@Override
public void on(KObject resolvedObject) {
System.out.println("Resolved=" + resolvedObject.toJSON());
}
});
});
}
