Domain Model as a Service

Modern Reactive CQRS Architecture Microservice Development Framework
Based on DDD & Event Sourcing

Domain-Driven · Event-Driven · Test-Driven · Declarative Design · Reactive · CQRS · Event Sourcing

English · 中文

Click the button above to create a new repository from Wow Project Template, then clone it and start writing your domain model.

Wow 8.x supports Spring Boot 4.x, Java 17+

Wow 6.x supports Spring Boot 3.x, Java 17+

As business complexity grows, traditional CRUD architectures hit bottlenecks — tangled database schemas, painful sharding, and fragile distributed transactions. Domain-Driven Design and Event Sourcing address these problems, but often come with steep learning curves and implementation overhead.

Wow was built to change that. After years of production validation, it distills DDD + ES into a developer-friendly framework where you focus on the domain model, and Wow handles the rest.

For developers:

• Focus on business, not infrastructure — Write only the domain model; Wow auto-generates OpenAPI interfaces
• Effortless testing — The Given→When→Expect pattern makes 85%+ unit test coverage the norm, not the exception
• Elegant read-write separation — Wait for the PROJECTED signal instead of guessing sync delays; no more "wait 1 second and refresh"
• Scale without code changes — Horizontal scaling without sharding rules or database relationship refactoring

For enterprises:

• Business Intelligence — State events and commands serve as rich, real-time data sources, reducing ETL to simple SQL scripts
• Operation Audit — Every command and its resulting domain events are recorded with clear business semantics
• Engineering Quality — In API testing, Wow-based projects showed only 1/3 the bug count of traditional-architecture projects at the same skill level

Stress test of the example application (2 min):

Given → When → Expect

class CartSpec : AggregateSpec<Cart, CartState>({
  on {
    whenCommand(AddCartItem(productId = "productId", quantity = 1)) {
      expectNoError()
      expectEventType(CartItemAdded::class)
      expectState {
        items.assert().hasSize(1)
      }
    }
  }
})

class CartSagaSpec : SagaSpec<CartSaga>({
  on {
    whenEvent(event = mockk<OrderCreated> {
      every { items } returns listOf(orderItem)
      every { fromCart } returns true
    }, ownerId = ownerId) {
      expectCommandType(RemoveCartItem::class)
    }
  }
})

Single Class	Inheritance	Aggregation

Wow is released under the Apache 2.0 License.