Wow微服務(wù)開發(fā)框架

Wow 是基于 DDD、EventSourcing 的現(xiàn)代響應(yīng)式 CQRS 架構(gòu)微服務(wù)開發(fā)框架。

領(lǐng)域驅(qū)動(dòng) | 事件驅(qū)動(dòng) | 測(cè)試驅(qū)動(dòng) | 聲明式設(shè)計(jì) ｜ 響應(yīng)式編程 ｜ 命令查詢職責(zé)分離 ｜ 事件源

架構(gòu)圖

事件源

可觀測(cè)性

Spring WebFlux 集成

自動(dòng)注冊(cè) 命令 路由處理函數(shù)(HandlerFunction) ，開發(fā)人員僅需編寫領(lǐng)域模型，即可完成服務(wù)開發(fā)。

測(cè)試套件：80%+ 的測(cè)試覆蓋率輕而易舉

Given -> When -> Expect .

前置條件

• 理解 領(lǐng)域驅(qū)動(dòng)設(shè)計(jì)：《實(shí)現(xiàn)領(lǐng)域驅(qū)動(dòng)設(shè)計(jì)》、《領(lǐng)域驅(qū)動(dòng)設(shè)計(jì)：軟件核心復(fù)雜性應(yīng)對(duì)之道》
• 理解 命令查詢職責(zé)分離（CQRS）
• 理解 事件源架構(gòu)
• 理解 響應(yīng)式編程

特性

•  Aggregate Modeling
  •  Single Class
  •  Inheritance Pattern
  •  Aggregation Pattern
•  Saga Modeling
  •  StatelessSaga
•  Test Suite
  •  兼容性測(cè)試規(guī)范（TCK）
  •  AggregateVerifier
  •  SagaVerifier
•  EventSourcing
  • EventStore
    •  MongoDB (Recommend)
    •  R2dbc
      •  Database Sharding
      •  Table Sharding
    •  Redis
  • Snapshot
    •  MongoDB
    •  R2dbc
      •  Database Sharding
      •  Table Sharding
    •  ElasticSearch
    •  Redis (Recommend)
•  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
•  可觀測(cè)性
  •  OpenTelemetry
•  OpenApi
•  WowMetadata Generator
  •  wow-compiler

Example

Example

測(cè)試套件

80%+ 的測(cè)試覆蓋率輕而易舉。

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()
    }

    /**
     * 創(chuàng)建訂單
     */
    @Test
    fun createOrder() {
        mockCreateOrder()
    }

    /**
     * 創(chuàng)建訂單-庫(kù)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 }
                    /*
                     * 模擬庫(kù)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：庫(kù)存不足異常.
             */
            .expectErrorType(InventoryShortageException::class.java)
            .expectStateAggregate {
                /*
                 * 該聚合對(duì)象處于未初始化狀態(tài)，即該聚合未創(chuàng)建成功.
                 */
                assertThat(it.initialized, equalTo(false))
            }.verify()
    }

    /**
     * 創(chuàng)建訂單-下單價(jià)格與當(dāng)前價(jià)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 }
                    /*
                     * 模擬下單價(jià)格、商品定價(jià)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：價(jià)格不一致異常.
             */
            .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. 當(dāng)接收到命令
             */
            .`when`(payOrder)
            /*
             * 3.1 期望將會(huì)產(chǎn)生1個(gè)事件
             */
            .expectEventCount(1)
            /*
             * 3.2 期望將會(huì)產(chǎn)生一個(gè) OrderPaid 事件 (3.1 可以不需要)
             */
            .expectEventType(OrderPaid::class.java)
            /*
             * 3.3 期望產(chǎn)生的事件狀態(tài)
             */
            .expectEventBody<OrderPaid> {
                assertThat(it.amount, equalTo(payOrder.amount))
            }
            /*
             * 4. 期望當(dāng)前聚合狀態(tài)
             */
            .expectState {
                assertThat(it.address, equalTo(SHIPPING_ADDRESS))
                assertThat(it.paidAmount, equalTo(payOrder.amount))
                assertThat(it.status, equalTo(OrderStatus.PAID))
            }
            /*
             * 完成測(cè)試編排后，驗(yàn)證期望.
             */
            .verify()
    }

    /**
     * 支付訂單
     */
    @Test
    fun payOrder() {
        mockPayOrder()
    }

    /**
     * 支付訂單-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. 處理 PayOrder 命令
             */
            .`when`(payOrder)
            /*
             * 3.1 期望將會(huì)產(chǎn)生倆個(gè)事件分別是： OrderPaid、OrderOverPaid
             */
            .expectEventType(OrderPaid::class.java, OrderOverPaid::class.java)
            /*
             * 3.2 期望產(chǎn)生的事件狀態(tài)
             */
            .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. 期望當(dāng)前聚合狀態(tài)
             */
            .expectState {
                assertThat(it.paidAmount, equalTo(previousState.totalAmount))
                assertThat(it.status, equalTo(OrderStatus.PAID))
            }
            .verify()
    }

    /**
     * 發(fā)貨
     */
    @Test
    fun ship() {
        val verifiedStageAfterPayOrder = mockPayOrder()
        val shipOrder = ShipOrder(verifiedStageAfterPayOrder.stateRoot.id)
        verifiedStageAfterPayOrder
            .then().given()
            .`when`(shipOrder)
            .expectEventType(OrderShipped::class.java)
            /*
             * 4. 期望當(dāng)前聚合狀態(tài)
             */
            .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 {
                /*
                 * 驗(yàn)證聚合狀態(tài)[未]發(fā)生變更.
                 */
                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()
    }
}

設(shè)計(jì)

聚合建模

Single Class	Inheritance Pattern	Aggregation Pattern

加載聚合

聚合狀態(tài)流

發(fā)送命令

命令與事件流

Saga - OrderProcessManager (Demo)