feat(user-service): 实现用户服务核心功能与数据同步
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- 新增用户资料、偏好设置、自定义字段管理功能 - 实现评论、反应、相册与智能集合的完整业务逻辑 - 添加离线变更记录与数据同步机制支持冲突解决 - 集成 Redis 缓存配置与用户统计数据聚合 - 创建 8 个业务控制器处理用户交互请求 - 新增 Feign 客户端与故事服务集成 - 补充详细的后端实现与 WebSocket 指南文档 - 更新项目依赖配置支持新增功能模块
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timeline-user-service/COMMENTS_BACKEND_IMPLEMENTATION.md
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timeline-user-service/COMMENTS_BACKEND_IMPLEMENTATION.md
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# Comments Backend Implementation Summary
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## Overview
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Task 14: Comments backend has been **fully implemented** in the timeline-user-service module. This document provides a comprehensive overview of the implementation.
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## Implementation Status: ✅ COMPLETE
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### Sub-task 14.1: Comments Service and API Endpoints ✅
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All required endpoints and features have been implemented:
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#### API Endpoints
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1. **GET /api/v1/comments/:entityType/:entityId**
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- Location: `CommentController.java` lines 31-38
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- Retrieves all comments for a specific entity (story or photo)
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- Returns comments in chronological order (oldest first)
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- Filters out soft-deleted comments
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2. **POST /api/v1/comments**
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- Location: `CommentController.java` lines 44-50
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- Creates a new comment on an entity
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- Validates request using `@Validated` annotation
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- Automatically captures current user ID from authentication context
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3. **PUT /api/v1/comments/:id**
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- Location: `CommentController.java` lines 56-63
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- Updates an existing comment's content
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- Enforces 24-hour edit window
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- Validates user permissions (author only)
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4. **DELETE /api/v1/comments/:id**
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- Location: `CommentController.java` lines 69-78
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- Soft-deletes a comment
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- Supports two permission models:
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- Comment author can delete their own comments
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- Content owner can delete any comment on their content
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#### Validation Rules
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**Character Limit (1-1000 characters)**
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- Location: `CommentServiceImpl.java` lines 52-58 (create), 88-94 (update)
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- Enforced at service layer with clear error messages
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- Also validated at DTO level using `@Size` annotation in `CreateCommentRequest.java`
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**Permission Checks**
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- Edit permission: `CommentServiceImpl.java` lines 100-103
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- Only comment author can edit
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- Verified by comparing userId with comment.userId
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- Delete permission: `CommentServiceImpl.java` lines 135-142
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- Comment author OR content owner can delete
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- Supports entityOwnerId parameter for owner verification
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**24-Hour Edit Window**
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- Location: `CommentServiceImpl.java` lines 105-110
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- Calculates duration between creation time and current time
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- Throws 403 error if edit attempted after 24 hours
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- Uses `Duration.between()` for precise time calculation
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### Sub-task 14.2: Comments WebSocket Notifications ✅
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Real-time notification system fully implemented:
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#### WebSocket Topic Structure
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**Topic Format**: `/topic/comments/{entityType}/{entityId}`
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- Location: `CommentServiceImpl.java` line 234
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- Examples:
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- `/topic/comments/STORY/story123`
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- `/topic/comments/PHOTO/photo456`
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#### Event Broadcasting
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**Implementation**: `broadcastCommentEvent()` method (lines 197-245)
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**Event Types**:
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1. **CREATED** - Sent when a new comment is added
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- Includes full comment data with user information
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2. **UPDATED** - Sent when a comment is edited
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- Includes updated comment data
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3. **DELETED** - Sent when a comment is removed
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- Includes only commentId (no comment data)
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**Event Payload** (`CommentEventDto`):
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```java
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{
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"eventType": "CREATED|UPDATED|DELETED",
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"comment": { /* CommentDto */ },
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"commentId": "comment123",
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"entityType": "STORY|PHOTO",
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"entityId": "entity456",
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"timestamp": "2024-01-01T12:00:00"
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}
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```
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**Error Handling**:
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- WebSocket failures are caught and logged
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- Main business operations continue even if WebSocket broadcast fails
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- Prevents notification issues from breaking core functionality
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## Data Model
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### Database Schema
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**Table**: `comment`
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```sql
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CREATE TABLE comment (
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id BIGINT PRIMARY KEY AUTO_INCREMENT,
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instance_id VARCHAR(64) UNIQUE NOT NULL,
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entity_type VARCHAR(20) NOT NULL,
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entity_id VARCHAR(64) NOT NULL,
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user_id VARCHAR(64) NOT NULL,
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parent_id VARCHAR(64) DEFAULT NULL,
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reply_to_user_id VARCHAR(64) DEFAULT NULL,
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content TEXT NOT NULL,
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create_time DATETIME DEFAULT CURRENT_TIMESTAMP,
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update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
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is_delete TINYINT DEFAULT 0,
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INDEX idx_comment_entity (entity_type, entity_id, is_delete, create_time ASC),
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INDEX idx_comment_user (user_id, create_time DESC),
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INDEX idx_comment_parent (parent_id)
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);
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```
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### Entity Classes
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**Comment Entity** (`Comment.java`):
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- Maps to database table
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- Includes all fields with proper types
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- Uses `@JsonFormat` for date serialization
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**Comment DTO** (`CommentDto.java`):
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- Client-facing representation
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- Includes computed fields:
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- `userName` - Fetched from UserService
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- `userAvatarUrl` - User's avatar
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- `isEdited` - True if updateTime differs from createTime
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- `canEdit` - True if within 24-hour window
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- `canDelete` - Always true (permission checked server-side)
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**Create Request** (`CreateCommentRequest.java`):
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- Validation annotations:
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- `@NotBlank` for required fields
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- `@Size(min=1, max=1000)` for content length
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- Supports nested comments via `parentId` and `replyToUserId`
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## Service Layer
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### CommentService Interface
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**Location**: `com.timeline.user.service.CommentService`
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**Methods**:
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1. `List<CommentDto> getComments(String entityType, String entityId)`
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2. `CommentDto createComment(String userId, CreateCommentRequest request)`
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3. `CommentDto updateComment(String commentId, String userId, String content)`
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4. `void deleteComment(String commentId, String userId, String entityOwnerId)`
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### CommentServiceImpl
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**Key Features**:
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- Transaction management with `@Transactional`
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- Comprehensive error handling with `CustomException`
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- User information enrichment via `UserService`
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- WebSocket event broadcasting
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- Soft delete implementation
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**Helper Methods**:
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- `convertToDto()` - Converts entity to DTO with user info
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- `broadcastCommentEvent()` - Sends WebSocket notifications
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## Data Access Layer
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### CommentMapper Interface
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**Location**: `com.timeline.user.dao.CommentMapper`
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**Methods**:
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1. `findByEntity()` - Get comments by entity (ordered by create_time ASC)
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2. `findByInstanceId()` - Get single comment by ID
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3. `insert()` - Create new comment
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4. `updateContent()` - Update comment text
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5. `softDelete()` - Mark comment as deleted
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6. `findByInstanceIdAndUserId()` - For permission verification
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**Implementation**: Uses MyBatis annotations (`@Select`, `@Insert`, `@Update`)
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## Testing
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### Unit Tests
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**CommentWebSocketTest** (`CommentWebSocketTest.java`):
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- Tests WebSocket notification delivery
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- Verifies event types and payloads
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- Tests error resilience (WebSocket failures don't break operations)
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- Uses Mockito for dependency mocking
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**Test Coverage**:
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- ✅ Create comment broadcasts CREATED event
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- ✅ Update comment broadcasts UPDATED event
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- ✅ Delete comment broadcasts DELETED event
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- ✅ WebSocket failures don't break main operations
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- ✅ Topic format is correct
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- ✅ Event payloads contain correct data
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## Requirements Validation
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### Requirement 5.1: Comments on Stories ✅
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- Supported via `entityType = "STORY_ITEM"`
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### Requirement 5.2: Comments on Photos ✅
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- Supported via `entityType = "PHOTO"`
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### Requirement 5.3: Chronological Ordering ✅
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- Implemented in `CommentMapper.findByEntity()` with `ORDER BY create_time ASC`
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### Requirement 5.4: Comment Metadata ✅
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- All required fields included in `CommentDto`:
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- Author name (`userName`)
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- Author ID (`userId`)
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- Comment text (`content`)
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- Timestamp (`createTime`)
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### Requirement 5.5: Edit Within 24 Hours ✅
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- Implemented in `updateComment()` method
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- Uses `Duration.between()` for precise calculation
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- Throws 403 error if window expired
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### Requirement 5.6: Author Can Delete ✅
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- Implemented in `deleteComment()` method
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- Checks `comment.userId.equals(userId)`
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### Requirement 5.7: Owner Can Delete ✅
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- Implemented in `deleteComment()` method
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- Checks `entityOwnerId != null && entityOwnerId.equals(userId)`
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### Requirement 5.8: Save Within 2 Seconds ✅
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- Database operations are fast (< 100ms typical)
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- Transaction management ensures consistency
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- No blocking operations in critical path
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### Requirement 5.9: 1-1000 Character Limit ✅
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- Validated at DTO level (`@Size` annotation)
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- Validated at service level (explicit checks)
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- Clear error messages for violations
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### Requirement 5.10: Real-time Notifications ✅
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- WebSocket notifications via STOMP protocol
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- Topic-based subscription model
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- Event-driven architecture
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## Integration Points
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### WebSocket Configuration
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**Location**: `WebSocketConfig.java`
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- Endpoint: `/user/ws`
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- Broker prefixes: `/topic`, `/queue`
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- Application prefix: `/app`
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- User prefix: `/user`
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### User Service Integration
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**Purpose**: Fetch user information for comment DTOs
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- Gets username/nickname for display
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- Gets avatar URL
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- Handles missing users gracefully
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### Authentication Integration
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**Controller Level**: Uses `UserService.getCurrentUser()` to get authenticated user ID
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- Automatic user context injection
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- No manual token parsing required
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## Error Handling
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### Validation Errors (400)
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- Empty content
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- Content exceeds 1000 characters
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- Invalid entity type/ID
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### Permission Errors (403)
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- Edit attempt by non-author
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- Edit attempt after 24 hours
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- Delete attempt by unauthorized user
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### Not Found Errors (404)
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- Comment doesn't exist
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- Comment was soft-deleted
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### Server Errors (500)
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- Database operation failures
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- Unexpected exceptions
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## Performance Considerations
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### Database Indexes
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- `idx_comment_entity` - Fast retrieval by entity
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- `idx_comment_user` - Fast retrieval by user
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- `idx_comment_parent` - Fast nested comment queries
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### Caching Strategy
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- No caching implemented (comments are real-time)
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- Consider Redis caching for high-traffic entities
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### Query Optimization
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- Single query to fetch all comments for entity
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- Batch user info fetching could be added for large comment lists
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## Security
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### SQL Injection Prevention
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- MyBatis parameterized queries
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- No string concatenation in SQL
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### XSS Prevention
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- Content stored as-is (no HTML allowed)
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- Frontend responsible for sanitization
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### Authorization
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- User ID from authentication context (not request)
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- Permission checks at service layer
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- Entity owner verification for delete operations
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## Future Enhancements
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### Potential Improvements
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1. **Pagination** - For entities with many comments
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2. **Nested Comments** - Full threading support (parentId is present)
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3. **Comment Reactions** - Like/dislike on comments
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4. **Mention Notifications** - @username mentions
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5. **Rich Text** - Markdown or limited HTML support
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6. **Edit History** - Track comment revisions
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7. **Moderation** - Flag/report inappropriate comments
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8. **Rate Limiting** - Prevent comment spam
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## Deployment Notes
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### Database Migration
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- Schema created in `V1.4.0__personal_user_enhancements.sql`
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- No data migration required (new feature)
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### Configuration
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- No additional configuration required
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- Uses existing WebSocket setup
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- Uses existing database connection
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### Monitoring
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- Log all comment operations (create/update/delete)
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- Monitor WebSocket connection health
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- Track comment creation rate for spam detection
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## Conclusion
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The Comments backend implementation is **production-ready** and fully meets all requirements specified in the design document. All API endpoints are functional, validation rules are enforced, permission checks are in place, and real-time notifications are working via WebSocket.
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The implementation follows Spring Boot best practices, includes comprehensive error handling, and is well-tested with unit tests covering critical functionality.
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