⚔️ GameGo — Virtual Asset Trading Platform

A high-concurrency virtual asset trading platform for in-game items, accounts, and digital goods.
Features flash sales, Alipay sandbox payment, and AI-powered review moderation.
Built end-to-end with an Agentic workflow powered by Claude Code.

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✨ Highlights

⚡ High-Concurrency Flash Sale & Order System

• Redisson distributed lock enforces one-order-per-user at the application layer; version-field optimistic lock at the database layer eliminates overselling under concurrent writes.
• Orders flow through RocketMQ for async decoupling, significantly boosting system throughput.
• Full payment lifecycle via Alipay Sandbox: PENDING → PAID → SHIPPED → COMPLETED.
• Spring Task auto-cancels timed-out orders; a state machine + optimistic lock guarantees atomic status transitions, safely resolving races between concurrent payment callbacks and scheduled cancellations.

🛡️ Two-Level Cache Architecture

Layer	Technology	Strategy
L1 Local	Caffeine	Hot data in-process, microsecond latency
L2 Distributed	Redis	Shared across instances, millisecond latency

• Bloom Filter prevents cache penetration on non-existent keys.
• Logical Expiration prevents hotspot key breakdown without locking the main thread.
• Dynamic random TTL offsets expiration timing to prevent cache avalanche.
• Cache Aside strategy: update DB first, then delete cache. On deletion failure, a RocketMQ delayed retry compensates; TTL serves as the final safety net — achieving eventual consistency.

🤖 AI-Powered Review Moderation

• Built on XLM-R-base (multilingual), extended with a Mixture-of-Experts (MoE) routing layer.
• Training uses dynamic temperature annealing sampling for load-balanced expert routing.
• LoRA supervised fine-tuning on domain-specific review dataset.
• Results: 98% accuracy on language-family classification, 85% recall on inappropriate content detection.

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🏗️ System Architecture

┌─────────────────────────────────────────────────────────────┐
│                        Client (Vue 3)                        │
│          Buyer │ Seller │ Admin                              │
└────────────────────────┬────────────────────────────────────┘
                         │ HTTP / JWT
                    ┌────▼────┐
                    │  Nginx  │  Reverse Proxy + Static Files
                    └────┬────┘
                         │
              ┌──────────▼──────────┐
              │   Spring Boot API   │
              │  MyBatis │ JWT Auth │
              └──┬──────┬──────┬───┘
                 │      │      │
         ┌───────▼─┐  ┌─▼──────▼──┐  ┌─────────────┐
         │  MySQL  │  │  Redis +  │  │  RocketMQ   │
         │ (orders │  │ Caffeine  │  │ (async jobs │
         │  items) │  │  Cache    │  │  & retries) │
         └─────────┘  └───────────┘  └──────┬──────┘
                                             │
                                    ┌────────▼────────┐
                                    │ Python AI Service│
                                    │ XLM-R + MoE +   │
                                    │    LoRA          │
                                    └─────────────────┘

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🔧 Tech Stack

Layer	Technology
Frontend	Vue 3, Vite, Element Plus, Pinia, Vue Router, ECharts
Backend	Spring Boot, MyBatis, JWT, Spring Task
Database	MySQL 8 (relational), Redis 7 (cache & session)
Cache	Caffeine (L1) + Redis (L2), Bloom Filter, Lua scripts
Messaging	RocketMQ 5 (async order flow, delayed retry)
Payment	Alipay Sandbox SDK
AI / ML	Python, XLM-R-base, MoE, LoRA, Transformers
Infrastructure	Nginx, Docker (optional)

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📸 Screenshots

Admin Console

User Management	Suspicious Behavior Detection

Category Management	Order Overview

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Buyer Portal

Product List	Flash Sale

Personalized Recommendations	Shopping Cart

Product Detail	Alipay Payment

My Orders	Review Submission

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Seller Dashboard

Sales Analytics	Order Management

Flash Sale Setup	Add Product

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🚀 Quick Start

Prerequisites

• JDK 17+
• Node.js 18+
• MySQL 8.x
• Redis 7.x
• RocketMQ 5.x (optional for full async flow)

Backend

# 1. Import database schema
mysql -u root -p < taobao.sql

# 2. Configure application.properties
#    Set your MySQL / Redis / RocketMQ / Alipay credentials

# 3. Run
cd TaobaoWeb
mvn spring-boot:run
# Starts on http://localhost:8081

Frontend

cd mall
npm install
npm run dev
# Starts on http://localhost:5173

Default Accounts

Role	Username	Password
Super Admin	admin	admin123
Buyer	buyer_demo	123456
Seller	seller_demo	123456

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📁 Project Structure

GameGo/
├── TaobaoWeb/               # Spring Boot backend
│   └── src/main/java/
│       ├── controller/      # REST API layer
│       ├── service/         # Business logic
│       ├── dao/             # MyBatis mappers
│       ├── entity/          # Domain models
│       └── dto/             # Data transfer objects
├── mall/                    # Vue 3 frontend
│   └── src/
│       ├── views/           # Page components (buyer/seller/admin)
│       ├── components/      # Shared UI components
│       ├── stores/          # Pinia state management
│       ├── api/             # Axios API modules
│       └── router/          # Vue Router config
├── docs/
│   └── screenshots/         # UI screenshots
└── taobao.sql               # Database schema & seed data

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🗺️ Roadmap

• Multi-role auth (Admin / Buyer / Seller) with JWT
• Product listing, search, category filtering
• Flash sale with distributed lock + optimistic lock
• Alipay Sandbox payment integration
• Two-level cache (Caffeine + Redis) with anti-penetration/avalanche
• RocketMQ async order flow + delayed retry for cache consistency
• AI review moderation (XLM-R + MoE + LoRA)
• Seller sales analytics dashboard (ECharts)
• Elasticsearch full-text search
• Kubernetes deployment manifests

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Built with ❤️ using an Agentic workflow powered by Claude Code