private bool TryGetMapping(string entityName, MappingUpdatedEvent updatedEvent, out EntityWithETag <MdmId> mapping)
 {
     mapping = mappingService.GetMapping(entityName, updatedEvent.EntityId, updatedEvent.MappingId);
     if (mapping.Object == null)
     {
         this.eventAggregator.Publish(
             new ErrorEvent("Unable to retrieve original mapping"));
         return(false);
     }
     return(true);
 }