[#45] Feat: 여러 사용자 동시 입장 API 구현

src/main/java/com/sajang/devracebackend/controller/RoomController.java

@@ -2,13 +2,16 @@
 
 import com.sajang.devracebackend.dto.problem.ProblemSaveRequestDto;
 import com.sajang.devracebackend.dto.room.RoomSaveResponseDto;
+import com.sajang.devracebackend.dto.user.UserEnterRequestDto;
 import com.sajang.devracebackend.response.ResponseCode;
 import com.sajang.devracebackend.response.ResponseData;
 import com.sajang.devracebackend.service.RoomService;
+import com.sajang.devracebackend.service.UserRoomService;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RestController;
@@ -21,6 +24,7 @@
 public class RoomController {
 
     private final RoomService roomService;
+    private final UserRoomService userRoomService;
 
 
     @PostMapping("/rooms")
@@ -29,4 +33,14 @@ public ResponseEntity<ResponseData<RoomSaveResponseDto>> createRoom(@RequestBody
         RoomSaveResponseDto roomSaveResponseDto = roomService.createRoom(problemSaveRequestDto);
         return ResponseData.toResponseEntity(ResponseCode.CREATED_ROOM, roomSaveResponseDto);
     }
+
+    @PostMapping("/rooms/{roomId}")
+    @Operation(summary = "방 입장 시작 [jwt O]")
+    public ResponseEntity<ResponseData> usersEnterRoom(
+            @PathVariable(value = "roomId") Long roomId,  // value=""를 작성해주어야만, Swagger에서 api테스트할때 이름값이 뜸.
+            @RequestBody UserEnterRequestDto userEnterRequestDto) {
+
+        userRoomService.usersEnterRoom(roomId, userEnterRequestDto);
+        return ResponseData.toResponseEntity(ResponseCode.CREATED_USERROOM);
+    }
 }

src/main/java/com/sajang/devracebackend/dto/chat/ChatSaveRequestDto.java

@@ -0,0 +1,39 @@
+package com.sajang.devracebackend.dto.chat;
+
+import com.sajang.devracebackend.domain.Chat;
+import com.sajang.devracebackend.domain.enums.MessageType;
+import jakarta.validation.constraints.NotNull;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import java.time.LocalDateTime;
+
+@Getter
+@NoArgsConstructor
+public class ChatSaveRequestDto {
+
+    // cannot NULL
+    @NotNull(message = "ERROR - roomId cannot be NULL")
+    private Long roomId;
+    @NotNull(message = "ERROR - senderId cannot be NULL")
+    private Long senderId;  // 첫 입장때는 방장 userId로.
+    @NotNull(message = "ERROR - messageType cannot be NULL")
+    private MessageType messageType;
+
+    // can NULL
+    @Setter
+    private String message;  // MessageType == 'ENTER' or 'LEAVE' or 'RANK' 일때는 null 가능. 'TALK'일때는 null 불가능.
+
+
+    public Chat toEntity(String senderName, String message, LocalDateTime createdTime) {
+        return Chat.ChatSaveBuilder()
+                .roomId(roomId)
+                .senderId(senderId)
+                .senderName(senderName)
+                .message(message)
+                .messageType(messageType)
+                .createdTime(createdTime)
+                .build();
+    }
+}

src/main/java/com/sajang/devracebackend/service/impl/UserRoomServiceImpl.java

@@ -1,9 +1,12 @@
 package com.sajang.devracebackend.service.impl;
 
+import com.sajang.devracebackend.domain.Chat;
 import com.sajang.devracebackend.domain.Room;
 import com.sajang.devracebackend.domain.User;
+import com.sajang.devracebackend.domain.enums.MessageType;
 import com.sajang.devracebackend.domain.mapping.UserRoom;
 import com.sajang.devracebackend.dto.user.UserEnterRequestDto;
+import com.sajang.devracebackend.repository.ChatRepository;
 import com.sajang.devracebackend.repository.UserRepository;
 import com.sajang.devracebackend.repository.UserRoomRepository;
 import com.sajang.devracebackend.service.RoomService;
@@ -13,6 +16,7 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.time.LocalDateTime;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -24,6 +28,7 @@ public class UserRoomServiceImpl implements UserRoomService {
     private final RoomService roomService;
     private final UserRepository userRepository;
     private final UserRoomRepository userRoomRepository;
+    private final ChatRepository chatRepository;
 
 
     @Transactional
@@ -39,6 +44,7 @@ public void createUserRoom(User user, Room room) {
     @Transactional
     @Override
     public void usersEnterRoom(Long roomId, UserEnterRequestDto userEnterRequestDto) {
+        User managerUser = userService.findLoginUser();  // 방장 = 로그인된 사용자
         Room room = roomService.findRoom(roomId);
         List<Long> userIdList = userEnterRequestDto.getUserIdList();
 
@@ -49,8 +55,28 @@ public void usersEnterRoom(Long roomId, UserEnterRequestDto userEnterRequestDto)
                         .room(room)
                         .build())
                 .collect(Collectors.toList());
+        userRooms.add(UserRoom.UserRoomSaveBuilder()
+                        .user(managerUser)
+                        .room(room)
+                        .build());
 
         // 한번에 저장 (여러번 DB에 접근하는것을 방지.)
         userRoomRepository.saveAll(userRooms);
+
+        String message = null;
+        if(userList.size() == 0) message = "'" + managerUser.getNickname() + "'님이 방에 참가하였습니다.";
+        else message = "'" + managerUser.getNickname() + "'님 외 " + userList.size() + "명이 방에 참가하였습니다.";
+
+        Chat chat = Chat.ChatSaveBuilder()
+                .roomId(roomId)
+                .senderId(managerUser.getId())
+                .senderName(managerUser.getNickname())
+                .message(message)
+                .messageType(MessageType.ENTER)
+                .createdTime(LocalDateTime.now())  // 시간을 수동으로 직접 넣어줌. (실시간으로 chat 넘겨주는 시간과 DB에 저장되는 시간을 완전히 같게 하기위해서임.)
+                .build();
+
+        // 입장 채팅 내역 저장
+        chatRepository.save(chat);
     }
 }