Backend Architecture

Info

This section documents the eIsland backend server architecture, including the modular monolith design, MySQL database schema, Redis caching layer, and RabbitMQ message queue topology.

Overview

The eIsland backend is a Java 25 Spring Boot 4.0.5 modular monolith serving RESTful APIs, real-time communication, and background processing for the desktop application. The architecture spans three major infrastructure layers:

• Application — Modular monolith with 11 Maven modules covering auth, user, agent, payment, weather, and more
• Data — MySQL for persistent storage, Redis for caching/rate-limiting/billing, RabbitMQ for async processing
• Security — JWT authentication, RBAC, rate limiting, replay protection, and Bloom filters

Documents

Document	Description
Server Architecture	Modular monolith design, module structure, dependency flow, security, API design, AI agent system, and payment system
MySQL Database Schema	Complete database schema: 37 tables across 13 domains with every field documented
Redis Architecture	Redis usage: 15 databases, ~83 key patterns, Bloom filters, Lua scripts, rate limiting, and distributed locks
RabbitMQ Architecture	Message queue topology: 6 exchanges, 21 queues, 9 message types, retry/DLQ pattern, and all producer/consumer flows