DDD CQRS Architecture

CQRS (Command Query Responsibility Segregation) — L1/L2/L3 adoption, Event Sourcing, idempotency, integration with 5 DDD architectures.

When to Use This Skill

Trigger keywords: CQRS, 读写分离, Event Sourcing, 事件溯源, Command Bus, Query Model, 领域事件, domain event, 幂等, idempotency, eventual consistency, projection, materialized view

Workflow

Step 1: 判断是否需要 CQRS → 确认读写模式是否显著分化
Step 2: 选择 CQRS 级别 → L1/L2/L3
Step 3: 设计命令模型 → Command → Handler → 领域事件
Step 4: 设计查询模型 → Query → Handler → DTO
Step 5: 实现事件同步（L2/L3）→ Outbox → 发布器 → 投影
Step 6: 按架构集成 → 根据 Layered/Onion/Hexagonal/Clean/COLA

When to Use CQRS