Feat: 알림 조회 no offset 페이징 API 구현 (#91)

src/main/java/com/numberone/backend/domain/notification/controller/NotificationController.java

@@ -0,0 +1,43 @@
+package com.numberone.backend.domain.notification.controller;
+
+import com.numberone.backend.domain.notification.dto.request.NotificationSearchParameter;
+import com.numberone.backend.domain.notification.dto.response.NotificationTabResponse;
+import com.numberone.backend.domain.notification.service.NotificationService;
+import io.swagger.v3.oas.annotations.Operation;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@Slf4j
+@RequestMapping("/api/notifications")
+@RestController
+@RequiredArgsConstructor
+public class NotificationController {
+    private final NotificationService notificationService;
+
+    @Operation(summary = "알림 리스트 조회 no offset Paging API 입니다.", description = """
+            요청 예시 url 은 아래와 같습니다.
+            'http://localhost:8080/api/notifications?page=0&size=10`
+             size 는 페이지의 사이즈를 의미합니다.
+             정렬 순서는 생성 시간 순(빠른 순)입니다.
+             
+             lastNotificationId 은 가장 직전에 조회한 페이지에서, 가장 마지막(작은) NotificationId 를 의미합니다.
+             - 첫 페이지를 요청하는 경우에는 null 로 보내야 합니다.
+             - 첫 페이지 이후에 대한 요청은, 직전 페이지에서 얻어온 페이지 리스트 중 가장 작은 NotificationId 를 담아서 보내면 다음 페이지가 요청됩니다.
+            """)
+    @GetMapping
+    public ResponseEntity<Slice<NotificationTabResponse>> getNotificationPage(
+            Pageable pageable,
+            @ModelAttribute NotificationSearchParameter param){
+        return ResponseEntity.ok(notificationService.getNotificationTabPagesByMember(param, pageable));
+    }
+
+}

src/main/java/com/numberone/backend/domain/notification/dto/request/NotificationSearchParameter.java

@@ -0,0 +1,12 @@
+package com.numberone.backend.domain.notification.dto.request;
+
+import lombok.*;
+
+@ToString
+@Builder
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+public class NotificationSearchParameter {
+    Long lastNotificationId;
+}

src/main/java/com/numberone/backend/domain/notification/dto/response/NotificationTabResponse.java

@@ -0,0 +1,38 @@
+package com.numberone.backend.domain.notification.dto.response;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+import com.numberone.backend.domain.notification.entity.NotificationEntity;
+import com.numberone.backend.domain.notification.entity.NotificationTag;
+import com.querydsl.core.annotations.QueryProjection;
+import lombok.*;
+
+import java.time.LocalDateTime;
+
+@ToString
+@Builder
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+public class NotificationTabResponse {
+    private Long id;
+    private String tag;
+    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm", timezone = "Asia/Seoul")
+    private LocalDateTime createdAt;
+    private String title;
+    private String body;
+
+
+    @QueryProjection
+    public NotificationTabResponse(NotificationEntity notification) {
+        this.id = notification.getId();
+        this.tag = switch (notification.getNotificationTag()) {
+            case FAMILY -> "가족";
+            case SUPPORT -> "후원";
+            case COMMUNITY -> "커뮤니티";
+        };
+        this.createdAt = notification.getCreatedAt();
+        this.title = notification.getTitle();
+        this.body = notification.getBody();
+    }
+
+}

src/main/java/com/numberone/backend/domain/notification/repository/NotificationRepository.java

@@ -1,7 +1,8 @@
 package com.numberone.backend.domain.notification.repository;
 
 import com.numberone.backend.domain.notification.entity.NotificationEntity;
+import com.numberone.backend.domain.notification.repository.custom.NotificationRepositoryCustom;
 import org.springframework.data.jpa.repository.JpaRepository;
 
-public interface NotificationRepository extends JpaRepository<NotificationEntity, Long> {
+public interface NotificationRepository extends JpaRepository<NotificationEntity, Long>, NotificationRepositoryCustom {
 }

src/main/java/com/numberone/backend/domain/notification/repository/custom/NotificationRepositoryCustom.java

@@ -0,0 +1,10 @@
+package com.numberone.backend.domain.notification.repository.custom;
+
+import com.numberone.backend.domain.notification.dto.request.NotificationSearchParameter;
+import com.numberone.backend.domain.notification.dto.response.NotificationTabResponse;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+
+public interface NotificationRepositoryCustom {
+    Slice<NotificationTabResponse> getNotificationTabPagesNoOffSetByMember(NotificationSearchParameter param, Long memberId, Pageable pageable);
+}

src/main/java/com/numberone/backend/domain/notification/repository/custom/NotificationRepositoryCustomImpl.java

@@ -0,0 +1,58 @@
+package com.numberone.backend.domain.notification.repository.custom;
+
+import com.numberone.backend.domain.notification.dto.request.NotificationSearchParameter;
+import com.numberone.backend.domain.notification.dto.response.NotificationTabResponse;
+import com.numberone.backend.domain.notification.dto.response.QNotificationTabResponse;
+import com.querydsl.core.types.dsl.BooleanExpression;
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import jakarta.persistence.EntityManager;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+import org.springframework.data.domain.SliceImpl;
+
+import java.util.List;
+import java.util.Objects;
+
+import static com.numberone.backend.domain.member.entity.QMember.member;
+import static com.numberone.backend.domain.notification.entity.QNotificationEntity.notificationEntity;
+
+public class NotificationRepositoryCustomImpl implements NotificationRepositoryCustom {
+    private final JPAQueryFactory queryFactory;
+
+    public NotificationRepositoryCustomImpl(EntityManager em) {
+        this.queryFactory = new JPAQueryFactory(em);
+    }
+
+    @Override
+    public Slice<NotificationTabResponse> getNotificationTabPagesNoOffSetByMember(NotificationSearchParameter param, Long memberId, Pageable pageable) {
+        List<NotificationTabResponse> result = queryFactory.select(new QNotificationTabResponse(notificationEntity))
+                .from(notificationEntity)
+                .innerJoin(member)
+                .on(notificationEntity.receivedMemberId.eq(member.id))
+                .where(
+                        ltNotificationEntityId(param.getLastNotificationId()),
+                        member.id.eq(memberId)
+                )
+                .orderBy(notificationEntity.id.desc())
+                .limit(pageable.getPageSize() + 1)
+                .fetch();
+        return checkLastPage(pageable, result);
+    }
+
+    private BooleanExpression ltNotificationEntityId(Long notificationId) {
+        if (Objects.isNull(notificationId)) {
+            return null;
+        }
+        return notificationEntity.id.lt(notificationId);
+    }
+
+    private Slice<NotificationTabResponse> checkLastPage(Pageable pageable, List<NotificationTabResponse> result) {
+        boolean hasNext = false;
+
+        if (result.size() > pageable.getPageSize()) {
+            hasNext = true;
+            result.remove(pageable.getPageSize());
+        }
+        return new SliceImpl<>(result, pageable, hasNext);
+    }
+}

src/main/java/com/numberone/backend/domain/notification/service/NotificationService.java

@@ -0,0 +1,32 @@
+package com.numberone.backend.domain.notification.service;
+
+import com.numberone.backend.domain.member.entity.Member;
+import com.numberone.backend.domain.member.repository.MemberRepository;
+import com.numberone.backend.domain.notification.dto.request.NotificationSearchParameter;
+import com.numberone.backend.domain.notification.dto.response.NotificationTabResponse;
+import com.numberone.backend.domain.notification.repository.NotificationRepository;
+import com.numberone.backend.domain.token.util.SecurityContextProvider;
+import com.numberone.backend.exception.notfound.NotFoundMemberException;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class NotificationService {
+    private final MemberRepository memberRepository;
+    private final NotificationRepository notificationRepository;
+
+    public Slice<NotificationTabResponse> getNotificationTabPagesByMember(NotificationSearchParameter param, Pageable pageable) {
+        String principal = SecurityContextProvider.getAuthenticatedUserEmail();
+        Member member = memberRepository.findByEmail(principal)
+                .orElseThrow(NotFoundMemberException::new);
+        return notificationRepository.getNotificationTabPagesNoOffSetByMember(param, member.getId(), pageable);
+    }
+
+}