基于 DDD、EventSourcing 的现代响应式 CQRS 架构微服务开发框架
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)
- EventStore
- 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
CommandAggregatetoRouterFunction
- 可观测性
- OpenTelemetry
- OpenAPI
-
WowMetadataGenerator-
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)
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