领域驱动 | 事件驱动 | 测试驱动 | 声明式设计 | 响应式编程 | 命令查询职责分离 | 事件溯源
架构图
事件源
可观测性
OpenAPI (Spring WebFlux 集成)
自动注册 命令 路由处理函数(
HandlerFunction) ，开发人员仅需编写领域模型，即可完成服务开发。
测试套件：80%+ 的测试覆盖率轻而易举
Given -> When -> Expect .
前置条件
- 理解 领域驱动设计：《实现领域驱动设计》、《领域驱动设计：软件核心复杂性应对之道》
- 理解 命令查询职责分离（CQRS）
- 理解 事件源架构
- 理解 响应式编程
特性
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- EventStore
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- Snapshot
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- EventStore
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Example
单元测试套件
80%+ 的测试覆盖率轻而易举。
Given -> When -> Expect .
Aggregate Unit Test (AggregateVerifier)
internal class OrderTest {
private fun mockCreateOrder(): VerifiedStage<OrderState> {
val tenantId = GlobalIdGenerator.generateAsString()
val customerId = GlobalIdGenerator.generateAsString()
val orderItem = OrderItem(
GlobalIdGenerator.generateAsString(),
GlobalIdGenerator.generateAsString(),
BigDecimal.valueOf(10),
10,
)
val orderItems = listOf(orderItem)
val inventoryService = object : InventoryService {
override fun getInventory(productId: String): Mono<Int> {
return orderItems.filter { it.productId == productId }.map { it.quantity }.first().toMono()
}
}
val pricingService = object : PricingService {
override fun getProductPrice(productId: String): Mono<BigDecimal> {
return orderItems.filter { it.productId == productId }.map { it.price }.first().toMono()
}
}
return aggregateVerifier<Order, OrderState>(tenantId = tenantId)
.inject(DefaultCreateOrderSpec(inventoryService, pricingService))
.given()
.`when`(CreateOrder(customerId, orderItems, SHIPPING_ADDRESS, false))
.expectEventCount(1)
.expectEventType(OrderCreated::class.java)
.expectStateAggregate {
assertThat(it.aggregateId.tenantId, equalTo(tenantId))
}
.expectState {
assertThat(it.id, notNullValue())
assertThat(it.customerId, equalTo(customerId))
assertThat(it.address, equalTo(SHIPPING_ADDRESS))
assertThat(it.items, equalTo(orderItems))
assertThat(it.status, equalTo(OrderStatus.CREATED))
}
.verify()
}
/**
* 创建订单
*/
@Test
fun createOrder() {
mockCreateOrder()
}
@Test
fun createOrderGivenEmptyItems() {
val customerId = GlobalIdGenerator.generateAsString()
aggregateVerifier<Order, OrderState>()
.inject(mockk<CreateOrderSpec>(), "createOrderSpec")
.given()
.`when`(CreateOrder(customerId, listOf(), SHIPPING_ADDRESS, false))
.expectErrorType(IllegalArgumentException::class.java)
.expectStateAggregate {
/*
* 该聚合对象处于未初始化状态，即该聚合未创建成功.
*/
assertThat(it.initialized, equalTo(false))
}.verify()
}
/**
* 创建订单-库存不足
*/
@Test
fun createOrderWhenInventoryShortage() {
val customerId = GlobalIdGenerator.generateAsString()
val orderItem = OrderItem(
GlobalIdGenerator.generateAsString(),
GlobalIdGenerator.generateAsString(),
BigDecimal.valueOf(10),
10,
)
val orderItems = listOf(orderItem)
val inventoryService = object : InventoryService {
override fun getInventory(productId: String): Mono<Int> {
return orderItems.filter { it.productId == productId }
/*
* 模拟库存不足
*/
.map { it.quantity - 1 }.first().toMono()
}
}
val pricingService = object : PricingService {
override fun getProductPrice(productId: String): Mono<BigDecimal> {
return orderItems.filter { it.productId == productId }.map { it.price }.first().toMono()
}
}
aggregateVerifier<Order, OrderState>()
.inject(DefaultCreateOrderSpec(inventoryService, pricingService))
.given()
.`when`(CreateOrder(customerId, orderItems, SHIPPING_ADDRESS, false))
/*
* 期望：库存不足异常.
*/
.expectErrorType(InventoryShortageException::class.java)
.expectStateAggregate {
/*
* 该聚合对象处于未初始化状态，即该聚合未创建成功.
*/
assertThat(it.initialized, equalTo(false))
}.verify()
}
/**
* 创建订单-下单价格与当前价格不一致
*/
@Test
fun createOrderWhenPriceInconsistency() {
val customerId = GlobalIdGenerator.generateAsString()
val orderItem = OrderItem(
GlobalIdGenerator.generateAsString(),
GlobalIdGenerator.generateAsString(),
BigDecimal.valueOf(10),
10,
)
val orderItems = listOf(orderItem)
val inventoryService = object : InventoryService {
override fun getInventory(productId: String): Mono<Int> {
return orderItems.filter { it.productId == productId }.map { it.quantity }.first().toMono()
}
}
val pricingService = object : PricingService {
override fun getProductPrice(productId: String): Mono<BigDecimal> {
return orderItems.filter { it.productId == productId }
/*
* 模拟下单价格、商品定价不一致
*/
.map { it.price.plus(BigDecimal.valueOf(1)) }.first().toMono()
}
}
aggregateVerifier<Order, OrderState>()
.inject(DefaultCreateOrderSpec(inventoryService, pricingService))
.given()
.`when`(CreateOrder(customerId, orderItems, SHIPPING_ADDRESS, false))
/*
* 期望：价格不一致异常.
*/
.expectErrorType(PriceInconsistencyException::class.java).verify()
}
}
Saga Unit Test (SagaVerifier)
class CartSagaTest {
@Test
fun onOrderCreated() {
val orderItem = OrderItem(
GlobalIdGenerator.generateAsString(),
GlobalIdGenerator.generateAsString(),
BigDecimal.valueOf(10),
10,
)
sagaVerifier<CartSaga>()
.`when`(
mockk<OrderCreated> {
every {
customerId
} returns "customerId"
every {
items
} returns listOf(orderItem)
every {
fromCart
} returns true
},
)
.expectCommandBody<RemoveCartItem> {
assertThat(it.id, equalTo("customerId"))
assertThat(it.productIds, hasSize(1))
assertThat(it.productIds.first(), equalTo(orderItem.productId))
}
.verify()
}
}
设计
聚合建模
| Single Class | Inheritance Pattern | Aggregation Pattern |
|---|---|---|
 |
 |
 |
加载聚合
聚合状态流
发送命令
命令与事件流
Saga - OrderProcessManager (Demo)
