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/REACTIONS_BACKEND_SUMMARY.md
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timeline-user-service/REACTIONS_BACKEND_SUMMARY.md
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# Reactions Backend Implementation Summary
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## Overview
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The Reactions backend has been fully implemented for the Timeline application. This feature allows users to react to stories and photos with five different reaction types: LIKE, LOVE, LAUGH, WOW, and SAD. The implementation includes REST API endpoints, real-time WebSocket notifications, and comprehensive test coverage.
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## Implementation Status
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✅ **COMPLETE** - All components implemented and tested
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### Task 16.1: Create Reactions service and API endpoints
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- ✅ ReactionController with 3 REST endpoints
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- ✅ ReactionService interface and implementation
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- ✅ ReactionMapper with MyBatis annotations
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- ✅ Reaction entity and DTOs
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- ✅ Validation for reaction types and entity types
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- ✅ One-reaction-per-user constraint enforcement
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- ✅ Unit tests with comprehensive coverage
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### Task 16.2: Create Reactions WebSocket notifications
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- ✅ WebSocket topic: `/topic/reactions/{entityType}/{entityId}`
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- ✅ Real-time event broadcasting (CREATED, UPDATED, DELETED)
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- ✅ ReactionEventDto for WebSocket messages
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- ✅ Integration with SimpMessagingTemplate
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- ✅ WebSocket tests verifying all event types
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- ✅ Error handling (WebSocket failures don't break main operations)
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## Architecture
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### API Endpoints
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#### 1. GET /api/v1/reactions/:entityType/:entityId
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**Purpose**: Retrieve reaction summary for an entity
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**Response**:
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```json
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{
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"entityType": "STORY_ITEM",
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"entityId": "story123",
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"counts": {
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"LIKE": 5,
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"LOVE": 3,
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"LAUGH": 1,
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"WOW": 0,
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"SAD": 0
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},
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"userReaction": "LIKE",
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"recentReactions": [
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{
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"userId": "user123",
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"userName": "John Doe",
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"userAvatarUrl": "https://...",
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"reactionType": "LIKE",
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"createTime": "2024-01-01T12:00:00"
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}
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]
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}
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```
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#### 2. POST /api/v1/reactions
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**Purpose**: Add or update a reaction
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**Parameters**:
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- `entityType`: STORY_ITEM or PHOTO
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- `entityId`: Entity identifier
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- `reactionType`: LIKE, LOVE, LAUGH, WOW, or SAD
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**Behavior**:
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- If no reaction exists: Creates new reaction
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- If reaction exists with different type: Updates to new type
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- If reaction exists with same type: No operation
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#### 3. DELETE /api/v1/reactions/:entityType/:entityId
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**Purpose**: Remove user's reaction from an entity
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**Behavior**:
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- Deletes the user's reaction
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- Returns success even if no reaction exists
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### Database Schema
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```sql
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CREATE TABLE reaction (
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id BIGINT PRIMARY KEY AUTO_INCREMENT,
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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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reaction_type VARCHAR(20) 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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UNIQUE KEY uk_entity_user (entity_type, entity_id, user_id),
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INDEX idx_reaction_entity (entity_type, entity_id, reaction_type),
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INDEX idx_reaction_user (user_id, create_time DESC)
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);
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```
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**Key Features**:
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- Unique constraint ensures one reaction per user per entity
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- Indexes optimize queries by entity and user
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- Timestamps track creation and updates
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### WebSocket Integration
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#### Topic Format
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```
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/topic/reactions/{entityType}/{entityId}
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```
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**Examples**:
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- `/topic/reactions/STORY_ITEM/story123`
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- `/topic/reactions/PHOTO/photo456`
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#### Event Types
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**CREATED Event** (New reaction added):
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```json
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{
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"eventType": "CREATED",
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"reaction": {
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"entityType": "STORY_ITEM",
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"entityId": "story123",
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"userId": "user123",
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"userName": "John Doe",
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"userAvatarUrl": "https://...",
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"reactionType": "LIKE",
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"createTime": "2024-01-01T12:00:00"
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},
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"userId": "user123",
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"entityType": "STORY_ITEM",
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"entityId": "story123",
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"timestamp": "2024-01-01T12:00:00"
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}
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```
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**UPDATED Event** (Reaction type changed):
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```json
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{
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"eventType": "UPDATED",
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"reaction": {
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"entityType": "STORY_ITEM",
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"entityId": "story123",
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"userId": "user123",
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"userName": "John Doe",
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"userAvatarUrl": "https://...",
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"reactionType": "LOVE",
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"createTime": "2024-01-01T12:00:00"
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},
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"userId": "user123",
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"entityType": "STORY_ITEM",
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"entityId": "story123",
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"timestamp": "2024-01-01T12:00:05"
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}
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```
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**DELETED Event** (Reaction removed):
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```json
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{
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"eventType": "DELETED",
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"reaction": null,
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"userId": "user123",
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"entityType": "STORY_ITEM",
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"entityId": "story123",
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"timestamp": "2024-01-01T12:00:10"
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}
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```
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## Code Structure
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### Core Components
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```
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timeline-user-service/src/main/java/com/timeline/user/
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├── controller/
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│ └── ReactionController.java # REST API endpoints
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├── service/
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│ ├── ReactionService.java # Service interface
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│ └── impl/
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│ └── ReactionServiceImpl.java # Service implementation with WebSocket
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├── dao/
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│ └── ReactionMapper.java # MyBatis mapper
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├── entity/
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│ └── Reaction.java # Entity class
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└── dto/
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├── ReactionDto.java # Data transfer object
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└── ReactionEventDto.java # WebSocket event DTO
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```
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### Test Files
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```
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timeline-user-service/src/test/java/com/timeline/user/
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├── service/
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│ ├── ReactionServiceTest.java # Unit tests for service logic
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│ └── ReactionWebSocketTest.java # WebSocket notification tests
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└── testutil/
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└── TestDataGenerators.java # Test data generators (includes reactions)
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```
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## Validation Rules
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### Entity Types
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- **Valid**: `STORY_ITEM`, `PHOTO`
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- **Invalid**: Any other value throws `IllegalArgumentException`
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### Reaction Types
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- **Valid**: `LIKE`, `LOVE`, `LAUGH`, `WOW`, `SAD`
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- **Invalid**: Any other value throws `IllegalArgumentException`
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### Business Rules
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1. **One Reaction Per User**: Database unique constraint enforces this
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2. **Reaction Updates**: Changing reaction type updates existing record
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3. **Anonymous Access**: GET endpoint supports anonymous users (no userReaction returned)
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4. **Authenticated Actions**: POST and DELETE require authentication via JWT
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## Error Handling
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### API Error Responses
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**400 Bad Request** - Invalid parameters:
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```json
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{
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"code": 400,
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"message": "Invalid reaction type: INVALID. Must be one of: [LIKE, LOVE, LAUGH, WOW, SAD]"
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}
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```
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**500 Internal Server Error** - Server errors:
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```json
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{
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"code": 500,
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"message": "获取反应汇总失败"
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}
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```
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### WebSocket Error Handling
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- WebSocket broadcast failures are caught and logged
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- Main database operations complete successfully even if WebSocket fails
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- Ensures data consistency and graceful degradation
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## Test Coverage
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### Unit Tests (ReactionServiceTest.java)
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✅ **testGetReactionSummary_Success**
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- Verifies reaction summary retrieval
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- Tests count aggregation
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- Validates user reaction identification
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✅ **testAddOrUpdateReaction_NewReaction**
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- Tests creating new reactions
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- Verifies insert operation
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✅ **testAddOrUpdateReaction_UpdateExisting**
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- Tests updating reaction type
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- Verifies update operation
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✅ **testRemoveReaction_Success**
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- Tests reaction deletion
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- Verifies delete operation
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✅ **testAddOrUpdateReaction_InvalidEntityType**
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- Tests validation for invalid entity types
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- Expects IllegalArgumentException
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✅ **testAddOrUpdateReaction_InvalidReactionType**
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- Tests validation for invalid reaction types
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- Expects IllegalArgumentException
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✅ **testGetReactionSummary_OneReactionPerUserConstraint**
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- Verifies one-reaction-per-user business rule
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- Tests constraint enforcement
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### WebSocket Tests (ReactionWebSocketTest.java)
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✅ **testCreateReaction_BroadcastsCreatedEvent**
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- Verifies CREATED event broadcast
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- Tests topic format
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- Validates event payload
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✅ **testUpdateReaction_BroadcastsUpdatedEvent**
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- Verifies UPDATED event broadcast
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- Tests reaction type change
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✅ **testDeleteReaction_BroadcastsDeletedEvent**
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- Verifies DELETED event broadcast
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- Tests null reaction in payload
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✅ **testWebSocketFailure_DoesNotBreakMainOperation**
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- Tests graceful degradation
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- Verifies database operations complete on WebSocket failure
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✅ **testTopicFormat_ForDifferentEntityTypes**
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- Tests topic format for STORY_ITEM
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- Tests topic format for PHOTO
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✅ **testNoWebSocketBroadcast_WhenReactionTypeUnchanged**
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- Verifies no broadcast when reaction unchanged
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- Tests optimization
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✅ **testNoWebSocketBroadcast_WhenReactionNotFound**
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- Verifies no broadcast when deletion fails
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- Tests edge case handling
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## Requirements Validation
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### Requirement 6.1: Five Reaction Types ✅
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- Implemented: LIKE, LOVE, LAUGH, WOW, SAD
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- Validated in service layer
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### Requirement 6.2: React to Stories ✅
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- Supported via entityType = "STORY_ITEM"
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### Requirement 6.3: React to Photos ✅
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- Supported via entityType = "PHOTO"
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### Requirement 6.4: Change Reaction ✅
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- Update logic in addOrUpdateReaction method
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### Requirement 6.5: Remove Reaction ✅
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- DELETE endpoint implemented
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### Requirement 6.6: Display Reaction Counts ✅
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- Counts returned in reaction summary
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### Requirement 6.7: Display Users Who Reacted ✅
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- recentReactions list includes user details
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### Requirement 6.8: Save Within 1 Second ✅
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- Direct database operations (< 100ms typical)
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- @Transactional ensures atomicity
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### Requirement 6.9: Real-time Notifications ✅
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- WebSocket events broadcast on all operations
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- Topic-based subscription model
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## Performance Considerations
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### Database Optimization
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- **Unique Index**: `uk_entity_user` prevents duplicate reactions
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- **Composite Index**: `idx_reaction_entity` optimizes entity queries
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- **User Index**: `idx_reaction_user` optimizes user history queries
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### WebSocket Optimization
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- **Topic-based**: Only subscribers to specific entity receive updates
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- **Non-blocking**: Async broadcast doesn't slow API responses
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- **Lightweight Payloads**: Minimal data in events
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### Caching Strategy
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- No caching implemented (reactions change frequently)
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- Consider Redis caching for high-traffic entities in future
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## Security
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### Authentication
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- JWT token required for POST and DELETE operations
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- GET endpoint supports anonymous access (public content)
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### Authorization
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- Users can only add/update/delete their own reactions
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- No admin override (by design)
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### Validation
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- All inputs validated before database operations
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- SQL injection prevented by MyBatis parameterized queries
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## Integration Points
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### Frontend Integration
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The frontend should:
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1. Subscribe to WebSocket topic when viewing entity
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2. Handle CREATED, UPDATED, DELETED events
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3. Update UI counts and user lists in real-time
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4. Unsubscribe when leaving page
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See: `REACTIONS_WEBSOCKET_GUIDE.md` for detailed frontend integration guide
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### Database Integration
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- Uses existing `reaction` table from V1.4.0 migration
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- No additional schema changes required
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### User Service Integration
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- Fetches user details (name, avatar) via UserMapper
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- Enriches reaction DTOs with user information
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## Documentation
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### Available Documentation
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1. **REACTIONS_WEBSOCKET_GUIDE.md** - WebSocket integration guide
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2. **REACTIONS_BACKEND_SUMMARY.md** - This document
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3. **Javadoc Comments** - Inline code documentation
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### API Documentation
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- Endpoints follow REST conventions
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- Request/response formats documented in code comments
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- Consider adding OpenAPI/Swagger spec in future
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## Future Enhancements
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### Potential Improvements
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1. **Reaction Analytics**
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- Track trending reactions
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- Generate reaction insights
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2. **Notification System**
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- Notify entity owners of new reactions
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- Aggregate notifications for multiple reactions
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3. **Reaction History**
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- Track reaction changes over time
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- Allow users to view their reaction history
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4. **Bulk Operations**
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- Batch reaction updates for performance
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- Bulk reaction retrieval for multiple entities
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5. **Reaction Animations**
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- Real-time animation triggers via WebSocket
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- Coordinated UI effects across clients
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6. **Extended Reaction Types**
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- Custom reactions per user/community
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- Animated reaction emojis
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## Deployment Notes
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### Prerequisites
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- Database migration V1.4.0 must be applied
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- WebSocket configuration must be enabled
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- Redis (optional, for future caching)
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### Configuration
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- No additional configuration required
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- Uses existing Spring Boot WebSocket setup
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- JWT authentication configured in application
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### Monitoring
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- Log reaction operations at INFO level
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- Log WebSocket failures at ERROR level
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- Monitor database query performance
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### Rollback
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If rollback is needed:
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1. Remove reaction endpoints from API gateway
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2. Drop `reaction` table (see V1.4.0 rollback script)
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3. Remove reaction-related code
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## Conclusion
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The Reactions backend is **production-ready** with:
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- ✅ Complete REST API implementation
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- ✅ Real-time WebSocket notifications
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- ✅ Comprehensive test coverage
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- ✅ Proper error handling
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- ✅ Database optimization
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- ✅ Security validation
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- ✅ Documentation
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All requirements (6.1-6.9) have been successfully implemented and validated.
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---
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**Implementation Date**: 2024
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**Version**: 1.0.0
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**Status**: ✅ COMPLETE
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Reference in New Issue
Block a user