public List<User> getAll(Role role, Sort sort) {
		return (role == null) ? userRepository.findAll(sort) : userRepository.findAllByRole(role, sort);
	}
Get the user list by the given role.

@param role role
@param sort sort
@return found user list
ngrinder-controller/src/main/java/org/ngrinder/user/service/UserService.java