👔 회원정보 변경 요청 UseCase-Service 추가(#3)

api/src/main/java/hexagonal/api/member/application/port/in/UpdateMemberUseCase.java

@@ -0,0 +1,6 @@
+package hexagonal.api.member.application.port.in;
+
+public interface UpdateMemberUseCase {
+
+    Long updateMember(UpdateMemberCommand command);
+}

api/src/main/java/hexagonal/api/member/application/service/UpdateMemberService.java

@@ -0,0 +1,39 @@
+package hexagonal.api.member.application.service;
+
+import hexagonal.api.member.application.port.in.UpdateMemberCommand;
+import hexagonal.api.member.application.port.in.UpdateMemberUseCase;
+import hexagonal.api.member.application.port.out.FindMemberPort;
+import hexagonal.api.member.application.port.out.UpdateMemberPort;
+import hexagonal.core.domain.jpa.MemberJpaEntity;
+import lombok.RequiredArgsConstructor;
+
+import javax.persistence.EntityNotFoundException;
+
+@RequiredArgsConstructor
+public class UpdateMemberService implements UpdateMemberUseCase {
+
+    private final FindMemberPort findMemberPort;
+    private final UpdateMemberPort updateMemberPort;
+
+    @Override
+    public Long updateMember(UpdateMemberCommand command) {
+        // ID 존재 여부 검사
+        if (checkMemberExistsById(command.getId())) {
+            MemberJpaEntity memberJpaEntity = command.toJpaEntity();
+            return updateMemberPort.updateMember(memberJpaEntity);
+        } else {
+            // FixMe Custom Exception 처리하기
+            return null;
+        }
+    }
+
+    private boolean checkMemberExistsById(Long id) {
+        try {
+            findMemberPort.findMemberById(id);
+        } catch (EntityNotFoundException e) {
+            return false;
+        }
+
+        return true;
+    }
+}