Wow 1.16.3 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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消息总线全面支持 LocalFirst模式

特性：支持 LocalFirstDomainEventBus
特性：支持 LocalFirstStateEventBus

架构图

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。

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
- StatefulSaga
Test Suite
- Test Specification
- AggregateVerifier
- StatelessSagaVerifier
EventSourcing
- EventStore
  - MongoDB (Recommend)
  - R2dbc
    - Database Sharding
    - Table Sharding
  - Redis
- Snapshot
  - MongoDB
  - R2dbc
    - Database Sharding
    - Table Sharding
  - ElasticSearch
  - Redis (Recommend)
  - KafkaSnapshotSink
CommandBus
- InMemoryCommandBus
- KafkaCommandBus (Recommend)
- RedisCommandBus
- LocalFirstCommandBus
DomainEventBus
- InMemoryDomainEventBus
- KafkaDomainEventBus (Recommend)
- RedisDomainEventBus
Spring 集成
- Spring Boot Auto Configuration
- Automatically register CommandAggregate to RouterFunction
可观测性
- OpenTelemetry
OpenApi
WowMetadata Generator
- wow-compiler

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()     } }