Wow 2.1.2 发布，让领域驱动设计变得触手可得

基于 DDD、EventSourcing 的现代响应式 CQRS 架构微服务开发框架

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 ｜ 事件源

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提升无租户模式易用性

• 特性: Wow 编译器支持生成静态租户ID元数据
• 特性: 扩展函数 asAggregateId 支持静态租户ID检测
• 特性: 命令元数据 CommandMetadata 支持静态租户ID检测
• 特性: Wow应用元数据 WowMetadata 支持静态租户ID检测

架构图

事件源

可观测性

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

•  Aggregate Modeling
  •  Single Class
  •  Inheritance Pattern
  •  Aggregation Pattern
•  Saga Modeling
  •  StatelessSaga
•  Test Suite
  •  兼容性测试规范（TCK）
  •  AggregateVerifier
  •  SagaVerifier
•  EventSourcing
  • EventStore
    •  MongoDB (Recommend)
    •  R2dbc
      •  Database Sharding
      •  Table Sharding
    •  Redis
  • Snapshot
    •  MongoDB
    •  R2dbc
      •  Database Sharding
      •  Table Sharding
    •  ElasticSearch
    •  Redis (Recommend)
•  命令等待策略（WaitStrategy）
  •  SENT : 命令发送成功后发送完成信号
  •  PROCESSED : 命令处理完成后发送完成信号
  •  SNAPSHOT : 快照生成完成后发送完成信号
  •  PROJECTED : 命令产生的事件被投影后发送完成信号
•  CommandBus
  •  InMemoryCommandBus
  •  KafkaCommandBus (Recommend)
  •  RedisCommandBus
  •  LocalFirstCommandBus
•  DomainEventBus
  •  InMemoryDomainEventBus
  •  KafkaDomainEventBus (Recommend)
  •  RedisDomainEventBus
  •  LocalFirstDomainEventBus
•  StateEventBus
  •  InMemoryStateEventBus
  •  KafkaStateEventBus (Recommend)
  •  RedisStateEventBus
  •  LocalFirstStateEventBus
•  Spring 集成
  •  Spring Boot Auto Configuration
  •  Automatically register CommandAggregate to RouterFunction
•  可观测性
  •  OpenTelemetry
•  OpenApi
•  WowMetadata Generator
  •  wow-compiler

Example

Example

测试套件

80%+ 的测试覆盖率轻而易举。

Given -> When -> Expect .

internal class OrderTest {

companion object {
val SHIPPING_ADDRESS = ShippingAddress("China", "ShangHai", "ShangHai", "HuangPu", "001")
}

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.toFlux().filter { it.productId == productId }.map { it.quantity }.last()
}
}
val pricingService = object : PricingService {
override fun getProductPrice(productId: String): Mono<BigDecimal> {
return orderItems.toFlux().filter { it.productId == productId }.map { it.price }.last()
}
}
return aggregateVerifier<Order, OrderState>(tenantId = tenantId)
.inject(DefaultCreateOrderSpec(inventoryService, pricingService))
.given()
.`when`(CreateOrder(customerId, orderItems, SHIPPING_ADDRESS))
.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()
}

/** * 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.toFlux().filter { it.productId == productId }
/* * 模拟库存不足 */
.map { it.quantity - 1 }.last()
}
}
val pricingService = object : PricingService {
override fun getProductPrice(productId: String): Mono<BigDecimal> {
return orderItems.toFlux().filter { it.productId == productId }.map { it.price }.last()
}
}

aggregateVerifier<Order, OrderState>()
.inject(DefaultCreateOrderSpec(inventoryService, pricingService))
.given()
.`when`(CreateOrder(customerId, orderItems, SHIPPING_ADDRESS))
/* * 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.toFlux().filter { it.productId == productId }.map { it.quantity }.last()
}
}
val pricingService = object : PricingService {
override fun getProductPrice(productId: String): Mono<BigDecimal> {
return orderItems.toFlux().filter { it.productId == productId }
/* * 模拟下单价格、商品定价不一致 */
.map { it.price.plus(BigDecimal.valueOf(1)) }.last()
}
}
aggregateVerifier<Order, OrderState>()
.inject(DefaultCreateOrderSpec(inventoryService, pricingService))
.given()
.`when`(CreateOrder(customerId, orderItems, SHIPPING_ADDRESS))
/* * 期望：价格不一致异常. */
.expectErrorType(PriceInconsistencyException::class.java).verify()
}

private fun mockPayOrder(): VerifiedStage<OrderState> {
val verifiedStageAfterCreateOrder = mockCreateOrder()
val previousState = verifiedStageAfterCreateOrder.stateRoot
val payOrder = PayOrder(
previousState.id,
GlobalIdGenerator.generateAsString(),
previousState.totalAmount
)

return verifiedStageAfterCreateOrder
.then()
.given()
/* * 2. 当接收到命令 */
.`when`(payOrder)
/* * 3.1 期望将会产生1个事件 */
.expectEventCount(1)
/* * 3.2 期望将会产生一个 OrderPaid 事件 (3.1 可以不需要) */
.expectEventType(OrderPaid::class.java)
/* * 3.3 期望产生的事件状态 */
.expectEventBody<OrderPaid> {
assertThat(it.amount, equalTo(payOrder.amount))
}
/* * 4. 期望当前聚合状态 */
.expectState {
assertThat(it.address, equalTo(SHIPPING_ADDRESS))
assertThat(it.paidAmount, equalTo(payOrder.amount))
assertThat(it.status, equalTo(OrderStatus.PAID))
}
/* * 完成测试编排后，验证期望. */
.verify()
}

/** * 支付订单 */
@Test
fun payOrder() {
mockPayOrder()
}

/** * 支付订单-超付 */
@Test
fun payOrderWhenOverPay() {
val verifiedStageAfterCreateOrder = mockCreateOrder()
val previousState = verifiedStageAfterCreateOrder.stateRoot
val payOrder = PayOrder(
previousState.id,
GlobalIdGenerator.generateAsString(),
previousState.totalAmount.plus(
BigDecimal.valueOf(1)
)
)
verifiedStageAfterCreateOrder
.then()
.given()
/* * 2. 处理 PayOrder 命令 */
.`when`(payOrder)
/* * 3.1 期望将会产生俩个事件分别是： OrderPaid、OrderOverPaid */
.expectEventType(OrderPaid::class.java, OrderOverPaid::class.java)
/* * 3.2 期望产生的事件状态 */
.expectEventStream {
val itr = it.iterator()
/* * OrderPaid */
val orderPaid = itr.next().body as OrderPaid
assertThat(orderPaid.paid, equalTo(true))
/* * OrderOverPaid */
val orderOverPaid = itr.next().body as OrderOverPaid
assertThat(
orderOverPaid.overPay,
equalTo(payOrder.amount.minus(previousState.totalAmount))
)
}
/* * 4. 期望当前聚合状态 */
.expectState {
assertThat(it.paidAmount, equalTo(previousState.totalAmount))
assertThat(it.status, equalTo(OrderStatus.PAID))
}
.verify()
}

/** * 发货 */
@Test
fun ship() {
val verifiedStageAfterPayOrder = mockPayOrder()
val shipOrder = ShipOrder(verifiedStageAfterPayOrder.stateRoot.id)
verifiedStageAfterPayOrder
.then().given()
.`when`(shipOrder)
.expectEventType(OrderShipped::class.java)
/* * 4. 期望当前聚合状态 */
.expectState {
assertThat(it.status, equalTo(OrderStatus.SHIPPED))
}
.verify()
}

@Test
fun shipGivenUnpaid() {
val verifiedStageAfterCreateOrder = mockCreateOrder()
val shipOrder = ShipOrder(verifiedStageAfterCreateOrder.stateRoot.id)
verifiedStageAfterCreateOrder.then().given()
.`when`(shipOrder)
.expectErrorType(IllegalStateException::class.java)
.expectState {
/* * 验证聚合状态[未]发生变更. */
assertThat(it.paidAmount, equalTo(BigDecimal.ZERO))
assertThat(it.status, equalTo(OrderStatus.CREATED))
}
.verify()
}

private fun mockDeleteOrder(): VerifiedStage<OrderState> {
val verifiedStageAfterCreateOrder = mockCreateOrder()
return verifiedStageAfterCreateOrder.then().given()
.`when`(DeleteAggregate)
.expectEventType(AggregateDeleted::class.java)
.expectStateAggregate {
assertThat(it.deleted, equalTo(true))
}
.verify()
}

@Test
fun deleteOrder() {
mockDeleteOrder()
}

@Test
fun deleteGivenDeleted() {
val verifiedStageAfterDelete = mockDeleteOrder()
verifiedStageAfterDelete.then().given()
.`when`(DeleteAggregate)
.expectErrorType(IllegalAccessDeletedAggregateException::class.java)
.expectError<IllegalAccessDeletedAggregateException> {
assertThat(it.aggregateId, equalTo(verifiedStageAfterDelete.stateAggregate.aggregateId))
}.expectStateAggregate {
assertThat(it.deleted, equalTo(true))
}
.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)