selfinterception

@ApplicationScoped 
public class CountryService {
  
  private @Inject Cache<String, Country> cache;
  
  private @Inject Self<CountryService> self;
  
  public Country getByIsoA3(String isoA3) {
    Country ctry = cache.get(isoA3);
    if (ctry == null) {
      ctry = self.get().fillCacheFromDb(isoA3);
    }
    return ctry;
  }
  
  @Transactional
  Country fillCacheFromDb(String isoA3) {
    transactionally load from db...
    and fill cache
  }
}