feat(note):优化笔记详情查询性能

- 引入 CompletableFuture 实现 RPC 调用异步化
- 并行调用用户服务与内容服务提升响应速度
- 使用 allOf 统一处理多个异步任务结果
- 保留原有缓存逻辑及异常处理机制
- 调整代码结构提高可读性和维护性

han-note-note/han-note-note-biz/src/main/java/com/hanserwei/hannote/note/biz/service/impl/NoteServiceImpl.java

@@ -39,6 +39,7 @@ import java.time.LocalDateTime;
 import java.util.List;
 import java.util.Objects;
 import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.TimeUnit;
 
 @Slf4j
@@ -167,6 +168,7 @@ public class NoteServiceImpl extends ServiceImpl<NoteDOMapper, NoteDO> implement
     }
 
     @Override
+    @SneakyThrows
     public Response<FindNoteDetailRspVO> findNoteDetail(FindNoteDetailReqVO findNoteDetailReqVO) {
         // 查询笔记ID
         Long noteId = findNoteDetailReqVO.getId();
@@ -224,13 +226,22 @@ public class NoteServiceImpl extends ServiceImpl<NoteDOMapper, NoteDO> implement
 
         // RPC调用用户服务，获取用户信息
         Long creatorId = noteDO.getCreatorId();
-        FindUserByIdRspDTO findUserByIdRspDTO = userRpcService.findById(creatorId);
+        CompletableFuture<FindUserByIdRspDTO> userResultFuture = CompletableFuture
+                .supplyAsync(() -> userRpcService.findById(creatorId), threadPoolTaskExecutor);
 
         // RPC: 调用 K-V 存储服务获取内容
-        String content = null;
+        CompletableFuture<String> contentResultFuture = CompletableFuture.completedFuture(null);
         if (Objects.equals(noteDO.getIsContentEmpty(), Boolean.FALSE)) {
-            content = keyValueRpcService.findNoteContent(noteDO.getContentUuid());
+            contentResultFuture = CompletableFuture
+                    .supplyAsync(() -> keyValueRpcService.findNoteContent(noteDO.getContentUuid()), threadPoolTaskExecutor);
         }
+        CompletableFuture<String> finalContentResultFuture = contentResultFuture;
+        CompletableFuture<FindNoteDetailRspVO> resultFuture = CompletableFuture
+                .allOf(userResultFuture, contentResultFuture)
+                .thenApply(s -> {
+                    // 获取 Future 返回的结果
+                    FindUserByIdRspDTO findUserByIdRspDTO = userResultFuture.join();
+                    String content = finalContentResultFuture.join();
 
                     // 笔记类型
                     Integer noteType = noteDO.getType();
@@ -245,7 +256,7 @@ public class NoteServiceImpl extends ServiceImpl<NoteDOMapper, NoteDO> implement
                     }
 
                     // 构建返参 VO 实体类
-        FindNoteDetailRspVO findNoteDetailRspVO = FindNoteDetailRspVO.builder()
+                    return FindNoteDetailRspVO.builder()
                             .id(noteDO.getId())
                             .type(noteDO.getType())
                             .title(noteDO.getTitle())
@@ -260,6 +271,11 @@ public class NoteServiceImpl extends ServiceImpl<NoteDOMapper, NoteDO> implement
                             .updateTime(noteDO.getUpdateTime())
                             .visible(noteDO.getVisible())
                             .build();
+
+                });
+
+        // 获取拼装后的 FindNoteDetailRspVO
+        FindNoteDetailRspVO findNoteDetailRspVO = resultFuture.get();
         // 异步线程中将笔记详情存入 Redis
         threadPoolTaskExecutor.submit(() -> {
             String noteDetailJson1 = JsonUtils.toJsonString(findNoteDetailRspVO);
@@ -272,6 +288,7 @@ public class NoteServiceImpl extends ServiceImpl<NoteDOMapper, NoteDO> implement
 
     /**
      * 校验笔记的可见性
+     *
      * @param visible   是否可见
      * @param userId    当前用户 ID
      * @param creatorId 笔记创建者
@@ -285,6 +302,7 @@ public class NoteServiceImpl extends ServiceImpl<NoteDOMapper, NoteDO> implement
 
     /**
      * 校验笔记的可见性（针对 VO 实体类）
+     *
      * @param userId              当前用户 ID
      * @param findNoteDetailRspVO 笔记详情VO类
      */