handlerRegs = new Registrations();
collaborators = Json.createObject();
Bus bus = internalApi.store.getBus();
if (errorHandler != null) {
handlerRegs.wrap(bus.subscribeLocal(
Constants.Topic.STORE + "/" + internalApi.id + "/" + Constants.Topic.DOCUMENT_ERROR,
new Handler<Message<Error>>() {
@Override
public void handle(Message<Error> message) {
Platform.scheduler().handle(errorHandler, message.body());