private void validateDuplicateMember(Member member) {
List<Member> findMembers = memberRepository.findByName(member.getName());
if (!findMembers.isEmpty()) {
throw new IllegalStateException("이미 존재하는 회원입니다.");
}
}
/** 전체 회원 조회 */
public List<Member> findMembers() {
return memberRepository.findAll();
}
/** 회원 가입 */
public Long join(Member member) {
validateDuplicateMember(member); // 중복 회원 검증
memberRepository.save(member);
return member.getId();
}