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 事件溯源架构
- 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
单元测试套件
80%+ 的测试覆盖率轻而易举。
Given -> When -> Expect .
Aggregate Unit Test (AggregateVerifier)
Aggregate Test
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)
Saga Test
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)
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