안 읽은 메시지 카운팅 기능 구현

backend/ddang/src/main/java/com/ddang/ddang/chat/application/ChatRoomService.java

@@ -9,6 +9,7 @@
 import com.ddang.ddang.chat.application.dto.CreateChatRoomDto;
 import com.ddang.ddang.chat.application.dto.ReadChatRoomWithLastMessageDto;
 import com.ddang.ddang.chat.application.dto.ReadParticipatingChatRoomDto;
+import com.ddang.ddang.chat.application.event.CreateReadMessageLogEvent;
 import com.ddang.ddang.chat.application.exception.ChatRoomNotFoundException;
 import com.ddang.ddang.chat.application.exception.InvalidAuctionToChatException;
 import com.ddang.ddang.chat.application.exception.InvalidUserToChat;
@@ -22,6 +23,7 @@
 import com.ddang.ddang.user.domain.User;
 import com.ddang.ddang.user.domain.repository.UserRepository;
 import lombok.RequiredArgsConstructor;
+import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -35,6 +37,7 @@ public class ChatRoomService {
 
  private static final Long DEFAULT_CHAT_ROOM_ID = null;
 
+ private final ApplicationEventPublisher messageLogEventPublisher;
  private final ChatRoomRepository chatRoomRepository;
  private final ChatRoomAndImageRepository chatRoomAndImageRepository;
  private final ChatRoomAndMessageAndImageRepository chatRoomAndMessageAndImageRepository;
@@ -51,9 +54,15 @@ public Long create(final Long userId, final CreateChatRoomDto chatRoomDto) {
  );
 
  return chatRoomRepository.findChatRoomIdByAuctionId(findAuction.getId())
- .orElseGet(() ->
- persistChatRoom(findUser, findAuction).getId()
- );
+ .orElseGet(() -> createChatRoom(findUser, findAuction));
+ }
+
+ private Long createChatRoom(final User findUser, final Auction findAuction) {
+ final ChatRoom persistChatRoom = persistChatRoom(findUser, findAuction);
+
+ messageLogEventPublisher.publishEvent(new CreateReadMessageLogEvent(persistChatRoom));
+
+ return persistChatRoom.getId();
  }
 
  private ChatRoom persistChatRoom(final User user, final Auction auction) {

backend/ddang/src/main/java/com/ddang/ddang/chat/application/LastReadMessageLogEventListener.java

@@ -0,0 +1,39 @@
+package com.ddang.ddang.chat.application;
+
+import com.ddang.ddang.chat.application.event.CreateReadMessageLogEvent;
+import com.ddang.ddang.chat.application.event.UpdateReadMessageLogEvent;
+import com.ddang.ddang.chat.application.exception.ReadMessageLogNotFoundException;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.transaction.event.TransactionalEventListener;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class LastReadMessageLogEventListener {
+
+ private final LastReadMessageLogService lastReadMessageLogService;
+
+ @TransactionalEventListener
+ @Transactional(propagation = Propagation.REQUIRES_NEW)
+ public void create(final CreateReadMessageLogEvent createReadMessageLogEvent) {
+ try {
+ lastReadMessageLogService.create(createReadMessageLogEvent);
+ } catch (final IllegalArgumentException ex) {
+ log.error("exception type : {}, ", ex.getClass().getSimpleName(), ex);
+ }
+ }
+
+ @TransactionalEventListener
+ @Transactional(propagation = Propagation.REQUIRES_NEW)
+ public void update(final UpdateReadMessageLogEvent updateReadMessageLogEvent) {
+ try {
+ lastReadMessageLogService.update(updateReadMessageLogEvent);
+ } catch (final ReadMessageLogNotFoundException ex) {
+ log.error("exception type : {}, ", ex.getClass().getSimpleName(), ex);
+ }
+ }
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/application/LastReadMessageLogService.java

@@ -0,0 +1,46 @@
+package com.ddang.ddang.chat.application;
+
+import com.ddang.ddang.chat.application.event.CreateReadMessageLogEvent;
+import com.ddang.ddang.chat.application.event.UpdateReadMessageLogEvent;
+import com.ddang.ddang.chat.application.exception.ReadMessageLogNotFoundException;
+import com.ddang.ddang.chat.domain.ChatRoom;
+import com.ddang.ddang.chat.domain.ReadMessageLog;
+import com.ddang.ddang.chat.domain.repository.ReadMessageLogRepository;
+import com.ddang.ddang.user.domain.User;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@Transactional(readOnly = true)
+@RequiredArgsConstructor
+public class LastReadMessageLogService {
+
+ private final ReadMessageLogRepository readMessageLogRepository;
+
+ @Transactional
+ public void create(final CreateReadMessageLogEvent createReadMessageLogEvent) {
+ final ChatRoom chatRoom = createReadMessageLogEvent.chatRoom();
+ final User buyer = chatRoom.getBuyer();
+ final User seller = chatRoom.getAuction().getSeller();
+ final ReadMessageLog buyerReadMessageLog = new ReadMessageLog(chatRoom, buyer);
+ final ReadMessageLog sellerReadMessageLog = new ReadMessageLog(chatRoom, seller);
+
+ readMessageLogRepository.saveAll(List.of(buyerReadMessageLog, sellerReadMessageLog));
+ }
+
+ @Transactional
+ public void update(final UpdateReadMessageLogEvent updateReadMessageLogEvent) {
+ final User reader = updateReadMessageLogEvent.reader();
+ final ChatRoom chatRoom = updateReadMessageLogEvent.chatRoom();
+ final ReadMessageLog messageLog = readMessageLogRepository.findBy(reader.getId(), chatRoom.getId())
+ .orElseThrow(() ->
+ new ReadMessageLogNotFoundException(
+ "메시지 조회 로그가 존재하지 않습니다."
+ ));
+
+ messageLog.updateLastReadMessage(updateReadMessageLogEvent.lastReadMessage().getId());
+ }
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/application/MessageService.java

@@ -3,6 +3,7 @@
 import com.ddang.ddang.chat.application.dto.CreateMessageDto;
 import com.ddang.ddang.chat.application.dto.ReadMessageDto;
 import com.ddang.ddang.chat.application.event.MessageNotificationEvent;
+import com.ddang.ddang.chat.application.event.UpdateReadMessageLogEvent;
 import com.ddang.ddang.chat.application.exception.ChatRoomNotFoundException;
 import com.ddang.ddang.chat.application.exception.MessageNotFoundException;
 import com.ddang.ddang.chat.application.exception.UnableToChatException;
@@ -15,7 +16,6 @@
 import com.ddang.ddang.user.domain.User;
 import com.ddang.ddang.user.domain.repository.UserRepository;
 import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -25,10 +25,10 @@
 @Service
 @Transactional(readOnly = true)
 @RequiredArgsConstructor
-@Slf4j
 public class MessageService {
 
- private final ApplicationEventPublisher messageEventPublisher;
+ private final ApplicationEventPublisher messageLogEventPublisher;
+ private final ApplicationEventPublisher messageNotificationEventPublisher;
  private final MessageRepository messageRepository;
  private final ChatRoomRepository chatRoomRepository;
  private final UserRepository userRepository;
@@ -53,16 +53,14 @@ public Long create(final CreateMessageDto dto, final String profileImageAbsolute
 
  final Message persistMessage = messageRepository.save(message);
 
- messageEventPublisher.publishEvent(new MessageNotificationEvent(persistMessage, profileImageAbsoluteUrl));
+ messageNotificationEventPublisher.publishEvent(new MessageNotificationEvent(persistMessage, profileImageAbsoluteUrl));
 
  return persistMessage.getId();
  }
 
  public List<ReadMessageDto> readAllByLastMessageId(final ReadMessageRequest request) {
- if (!userRepository.existsById(request.messageReaderId())) {
- throw new UserNotFoundException("지정한 아이디에 대한 사용자를 찾을 수 없습니다.");
- }
-
+ final User reader = userRepository.findById(request.messageReaderId())
+ .orElseThrow(() -> new UserNotFoundException("지정한 아이디에 대한 사용자를 찾을 수 없습니다."));
  final ChatRoom chatRoom = chatRoomRepository.findById(request.chatRoomId())
  .orElseThrow(() -> new ChatRoomNotFoundException(
  "지정한 아이디에 대한 채팅방을 찾을 수 없습니다."));
@@ -77,6 +75,12 @@ public List<ReadMessageDto> readAllByLastMessageId(final ReadMessageRequest requ
  request.lastMessageId()
  );
 
+ if (!readMessages.isEmpty()) {
+ final Message lastReadMessage = readMessages.get(readMessages.size() - 1);
+
+ messageLogEventPublisher.publishEvent(new UpdateReadMessageLogEvent(reader, chatRoom, lastReadMessage));
+ }
+
  return readMessages.stream()
  .map(message -> ReadMessageDto.from(message, chatRoom))
  .toList();

backend/ddang/src/main/java/com/ddang/ddang/chat/application/dto/ReadChatRoomWithLastMessageDto.java

@@ -11,6 +11,7 @@ public record ReadChatRoomWithLastMessageDto(
  ReadAuctionInChatRoomDto auctionDto,
  ReadUserInChatRoomDto partnerDto,
  ReadLastMessageDto lastMessageDto,
+ Long unreadMessageCount,
  boolean isChatAvailable
 ) {
 
@@ -22,12 +23,14 @@ public static ReadChatRoomWithLastMessageDto of(
  final User partner = chatRoom.calculateChatPartnerOf(findUser);
  final Message lastMessage = chatRoomAndMessageAndImageDto.message();
  final AuctionImage thumbnailImage = chatRoomAndMessageAndImageDto.thumbnailImage();
+ final Long unreadMessages = chatRoomAndMessageAndImageDto.unreadMessageCount();
 
  return new ReadChatRoomWithLastMessageDto(
  chatRoom.getId(),
  ReadAuctionInChatRoomDto.of(chatRoom.getAuction(), thumbnailImage),
  ReadUserInChatRoomDto.from(partner),
  ReadLastMessageDto.from(lastMessage),
+ unreadMessages,
  chatRoom.isChatAvailablePartner(partner)
  );
  }

backend/ddang/src/main/java/com/ddang/ddang/chat/application/event/CreateReadMessageLogEvent.java

@@ -0,0 +1,6 @@
+package com.ddang.ddang.chat.application.event;
+
+import com.ddang.ddang.chat.domain.ChatRoom;
+
+public record CreateReadMessageLogEvent(ChatRoom chatRoom) {
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/application/event/UpdateReadMessageLogEvent.java

@@ -0,0 +1,8 @@
+package com.ddang.ddang.chat.application.event;
+
+import com.ddang.ddang.chat.domain.ChatRoom;
+import com.ddang.ddang.chat.domain.Message;
+import com.ddang.ddang.user.domain.User;
+
+public record UpdateReadMessageLogEvent(User reader, ChatRoom chatRoom, Message lastReadMessage) {
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/application/exception/ReadMessageLogNotFoundException.java

@@ -0,0 +1,8 @@
+package com.ddang.ddang.chat.application.exception;
+
+public class ReadMessageLogNotFoundException extends IllegalArgumentException {
+
+ public ReadMessageLogNotFoundException(final String message) {
+ super(message);
+ }
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/domain/ReadMessageLog.java

@@ -0,0 +1,49 @@
+package com.ddang.ddang.chat.domain;
+
+import com.ddang.ddang.user.domain.User;
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.ForeignKey;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToOne;
+import lombok.AccessLevel;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Getter
+@EqualsAndHashCode(of = "id", callSuper = false)
+@ToString(of = {"id", "lastReadMessageId"})
+public class ReadMessageLog {
+
+ @Id
+ @GeneratedValue(strategy = GenerationType.IDENTITY)
+ private Long id;
+
+ @ManyToOne(fetch = FetchType.LAZY, cascade = {CascadeType.REMOVE})
+ @JoinColumn(name = "chat_room_id", nullable = false, foreignKey = @ForeignKey(name = "fk_read_message_log_chat_room"))
+ private ChatRoom chatRoom;
+
+ @OneToOne(fetch = FetchType.LAZY, cascade = {CascadeType.REMOVE})
+ @JoinColumn(name = "reader_id", nullable = false, foreignKey = @ForeignKey(name = "fk_read_message_log_reader"))
+ private User reader;
+
+ private Long lastReadMessageId = 0L;
+
+ public ReadMessageLog(final ChatRoom chatRoom, final User reader) {
+ this.chatRoom = chatRoom;
+ this.reader = reader;
+ }
+
+ public void updateLastReadMessage(final Long lastReadMessageId) {
+ this.lastReadMessageId = lastReadMessageId;
+ }
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/domain/dto/ChatRoomAndMessageAndImageDto.java

@@ -4,5 +4,10 @@
 import com.ddang.ddang.chat.domain.Message;
 import com.ddang.ddang.image.domain.AuctionImage;
 
-public record ChatRoomAndMessageAndImageDto(ChatRoom chatRoom, Message message, AuctionImage thumbnailImage) {
+public record ChatRoomAndMessageAndImageDto(
+ ChatRoom chatRoom,
+ Message message,
+ AuctionImage thumbnailImage,
+ Long unreadMessageCount
+) {
 }

backend/ddang/src/main/java/com/ddang/ddang/chat/domain/repository/ReadMessageLogRepository.java

@@ -0,0 +1,13 @@
+package com.ddang.ddang.chat.domain.repository;
+
+import com.ddang.ddang.chat.domain.ReadMessageLog;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface ReadMessageLogRepository {
+
+ Optional<ReadMessageLog> findBy(final Long readerId, final Long chatRoomId);
+
+ List<ReadMessageLog> saveAll(List<ReadMessageLog> readMessageLogs);
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/infrastructure/persistence/JpaReadMessageLogRepository.java

@@ -0,0 +1,17 @@
+package com.ddang.ddang.chat.infrastructure.persistence;
+
+import com.ddang.ddang.chat.domain.ReadMessageLog;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.Optional;
+
+public interface JpaReadMessageLogRepository extends JpaRepository<ReadMessageLog, Long> {
+
+ @Query("""
+ SELECT rml
+ FROM ReadMessageLog rml 
+ WHERE rml.chatRoom.id = :chatRoomId AND rml.reader.id = :readerId
+ """)
+ Optional<ReadMessageLog> findLastReadMessageByUserIdAndChatRoomId(final Long readerId, final Long chatRoomId);
+}

backend/ddang/src/main/java/com/ddang/ddang/chat/infrastructure/persistence/QuerydslChatRoomAndMessageAndImageRepository.java

@@ -5,6 +5,7 @@
 import com.ddang.ddang.chat.infrastructure.persistence.dto.QChatRoomAndMessageAndImageQueryProjectionDto;
 import com.querydsl.core.types.dsl.BooleanExpression;
 import com.querydsl.jpa.JPAExpressions;
+import com.querydsl.jpa.JPQLQuery;
 import com.querydsl.jpa.impl.JPAQueryFactory;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Repository;
@@ -15,6 +16,7 @@
 import static com.ddang.ddang.auction.domain.QAuction.auction;
 import static com.ddang.ddang.chat.domain.QChatRoom.chatRoom;
 import static com.ddang.ddang.chat.domain.QMessage.message;
+import static com.ddang.ddang.chat.domain.QReadMessageLog.readMessageLog;
 import static com.ddang.ddang.image.domain.QAuctionImage.auctionImage;
 import static java.util.Comparator.comparing;
 
@@ -26,8 +28,12 @@ public class QuerydslChatRoomAndMessageAndImageRepository {
 
  public List<ChatRoomAndMessageAndImageDto> findAllChatRoomInfoByUserIdOrderByLastMessage(final Long userId) {
  final List<ChatRoomAndMessageAndImageQueryProjectionDto> unsortedDtos =
- queryFactory.select(new QChatRoomAndMessageAndImageQueryProjectionDto(chatRoom, message, auctionImage))
- .from(chatRoom)
+ queryFactory.select(new QChatRoomAndMessageAndImageQueryProjectionDto(
+ chatRoom,
+ message,
+ auctionImage,
+ countUnreadMessages(userId)
+ )).from(chatRoom)
  .leftJoin(chatRoom.buyer).fetchJoin()
  .leftJoin(chatRoom.auction, auction).fetchJoin()
  .leftJoin(auction.seller).fetchJoin()
@@ -52,6 +58,21 @@ public List<ChatRoomAndMessageAndImageDto> findAllChatRoomInfoByUserIdOrderByLas
  return sortByLastMessageIdDesc(unsortedDtos);
  }
 
+ private static JPQLQuery<Long> countUnreadMessages(final Long userId) {
+ return JPAExpressions.select(message.count())
+ .from(message)
+ .where(
+ message.chatRoom.id.eq(chatRoom.id),
+ message.writer.id.ne(userId),
+ message.id.gt(
+ JPAExpressions
+ .select(readMessageLog.lastReadMessageId)
+ .from(readMessageLog)
+ .where(readMessageLog.reader.id.eq(userId))
+ )
+ );
+ }
+
  private List<ChatRoomAndMessageAndImageDto> sortByLastMessageIdDesc(
  final List<ChatRoomAndMessageAndImageQueryProjectionDto> unsortedDtos
  ) {