@Override
	public Collection<Visit> findVisitsByPetId(int petId) {
		return visitRepository.findByPetId(petId);
	}
Mostly used as a facade for all Petclinic controllers
Also a placeholder for @Transactional and @Cacheable annotations

@author Michael Isvy
src/main/java/org/springframework/samples/petclinic/service/ClinicServiceImpl.java