[#41] feat: 전체 채팅 조회 기능

Author: pythonstrup

src/main/java/com/nexters/teamace/chat/application/AllChatQuery.java

@@ -0,0 +1,14 @@
+package com.nexters.teamace.chat.application;
+
+import com.nexters.teamace.common.exception.ValidationErrorMessage;
+
+public record AllChatQuery(Long chatRoomId) {
+    public AllChatQuery {
+        if (chatRoomId == null) {
+            throw new IllegalArgumentException(ValidationErrorMessage.CHAT_ROOM_ID_NOT_NULL);
+        }
+        if (chatRoomId < 1) {
+            throw new IllegalArgumentException(ValidationErrorMessage.CHAT_ROOM_ID_POSITIVE);
+        }
+    }
+}

src/main/java/com/nexters/teamace/chat/application/AllChatResult.java

@@ -0,0 +1,9 @@
+package com.nexters.teamace.chat.application;
+
+import com.nexters.teamace.chat.domain.MessageType;
+import java.util.List;
+
+public record AllChatResult(Long chatRoomId, List<ChatResult> chats) {
+
+    public record ChatResult(Long chatId, MessageType type, String message) {}
+}

src/main/java/com/nexters/teamace/chat/application/ChatRoomService.java

@@ -4,6 +4,7 @@
 import com.nexters.teamace.chat.domain.ChatMessageGenerator;
 import com.nexters.teamace.chat.domain.ChatRoom;
 import com.nexters.teamace.chat.domain.ChatRoomRepository;
+import com.nexters.teamace.common.infrastructure.annotation.ReadOnlyTransactional;
 import com.nexters.teamace.user.application.GetUserResult;
 import com.nexters.teamace.user.application.UserService;
 import lombok.RequiredArgsConstructor;
@@ -44,4 +45,17 @@ public SendMessageResult sendMessage(final SendMessageCommand command) {
 
         return new SendMessageResult(responseMessage);
     }
+
+    @ReadOnlyTransactional
+    public AllChatResult getAllChats(final AllChatQuery query) {
+        final ChatRoom chatRoom = chatRoomRepository.getById(query.chatRoomId());
+        return new AllChatResult(
+                chatRoom.getId(),
+                chatRoom.getChats().stream()
+                        .map(
+                                chat ->
+                                        new AllChatResult.ChatResult(
+                                                chat.getId(), chat.getType(), chat.getMessage()))
+                        .toList());
+    }
 }

src/main/java/com/nexters/teamace/common/infrastructure/annotation/ReadOnlyTransactional.java

@@ -0,0 +1,13 @@
+package com.nexters.teamace.common.infrastructure.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+
+@Target({ElementType.TYPE, ElementType.METHOD})
+@Retention(RetentionPolicy.RUNTIME)
+@Transactional(readOnly = true, propagation = Propagation.SUPPORTS)
+public @interface ReadOnlyTransactional {}