Wow 2.2.1 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

更新内容 🎉 🎉 🎉

• 特性: Wow 编译器(wow-compiler)支持检测聚合模型超类静态租户ID
• 特性: 新增 RecordEventFunctionErrorHandler 支持记录事件函数处理异常，以支持更友好的事件补偿
• 特性: AggregateVerifier 支持尽早检测状态聚合模型序列化问题
• 特性: CommandHandlerFunction 支持从 Http.Header 中获取聚合ID

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)