SpringBoot实现六边形架构的三种不同方式详解
作者:风象南
一、六边形架构基本原理
1.1 核心概念
六边形架构由Alistair Cockburn于2005年提出,其核心思想是将应用程序的内部业务逻辑与外部交互隔离开来。这种架构主要由三部分组成:
- 领域(Domain) :包含业务逻辑和领域模型,是应用程序的核心
- 端口(Ports) :定义应用程序与外部世界交互的接口
- 适配器(Adapters) :实现端口接口,连接外部世界与应用程序
1.2 端口分类
端口通常分为两类:
- 输入端口(Primary/Driving Ports) :允许外部系统驱动应用程序,如REST API、命令行接口
- 输出端口(Secondary/Driven Ports) :允许应用程序驱动外部系统,如数据库、消息队列、第三方服务
1.3 六边形架构的优势
- 业务逻辑独立性:核心业务逻辑不依赖于特定技术框架
- 可测试性:业务逻辑可以在没有外部依赖的情况下进行测试
- 灵活性:可以轻松替换技术实现而不影响业务逻辑
- 关注点分离:明确区分了业务规则和技术细节
- 可维护性:使代码结构更加清晰,便于维护和扩展
二、经典六边形架构实现
2.1 项目结构
经典六边形架构严格遵循原始设计理念,通过明确的包结构分离领域逻辑和适配器:
src/main/java/com/example/demo/
├── domain/ # 领域层
│ ├── model/ # 领域模型
│ ├── service/ # 领域服务
│ └── port/ # 端口定义
│ ├── incoming/ # 输入端口
│ └── outgoing/ # 输出端口
├── adapter/ # 适配器层
│ ├── incoming/ # 输入适配器
│ │ ├── rest/ # REST API适配器
│ │ └── scheduler/ # 定时任务适配器
│ └── outgoing/ # 输出适配器
│ ├── persistence/ # 持久化适配器
│ └── messaging/ # 消息适配器
└── application/ # 应用配置
└── config/ # Spring配置类
2.2 代码实现
2.2.1 领域模型
// 领域模型 package com.example.demo.domain.model; public class Product { private Long id; private String name; private double price; private int stock; // 构造函数、getter和setter // 领域行为 public boolean isAvailable() { return stock > 0; } public void decreaseStock(int quantity) { if (quantity > stock) { throw new IllegalArgumentException("Not enough stock"); } this.stock -= quantity; } }
2.2.2 输入端口
// 输入端口(用例接口) package com.example.demo.domain.port.incoming; import com.example.demo.domain.model.Product; import java.util.List; import java.util.Optional; public interface ProductService { List<Product> getAllProducts(); Optional<Product> getProductById(Long id); Product createProduct(Product product); void updateStock(Long productId, int quantity); }
2.2.3 输出端口
// 输出端口(存储库接口) package com.example.demo.domain.port.outgoing; import com.example.demo.domain.model.Product; import java.util.List; import java.util.Optional; public interface ProductRepository { List<Product> findAll(); Optional<Product> findById(Long id); Product save(Product product); void deleteById(Long id); }
2.2.4 领域服务实现
// 领域服务实现 package com.example.demo.domain.service; import com.example.demo.domain.model.Product; import com.example.demo.domain.port.incoming.ProductService; import com.example.demo.domain.port.outgoing.ProductRepository; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; import java.util.Optional; @Service public class ProductServiceImpl implements ProductService { private final ProductRepository productRepository; public ProductServiceImpl(ProductRepository productRepository) { this.productRepository = productRepository; } @Override public List<Product> getAllProducts() { return productRepository.findAll(); } @Override public Optional<Product> getProductById(Long id) { return productRepository.findById(id); } @Override public Product createProduct(Product product) { return productRepository.save(product); } @Override @Transactional public void updateStock(Long productId, int quantity) { Product product = productRepository.findById(productId) .orElseThrow(() -> new RuntimeException("Product not found")); product.decreaseStock(quantity); productRepository.save(product); } }
2.2.5 输入适配器(REST API)
// REST适配器 package com.example.demo.adapter.incoming.rest; import com.example.demo.domain.model.Product; import com.example.demo.domain.port.incoming.ProductService; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.*; import java.util.List; @RestController @RequestMapping("/api/products") public class ProductController { private final ProductService productService; public ProductController(ProductService productService) { this.productService = productService; } @GetMapping public List<Product> getAllProducts() { return productService.getAllProducts(); } @GetMapping("/{id}") public ResponseEntity<Product> getProductById(@PathVariable Long id) { return productService.getProductById(id) .map(ResponseEntity::ok) .orElse(ResponseEntity.notFound().build()); } @PostMapping public Product createProduct(@RequestBody Product product) { return productService.createProduct(product); } @PutMapping("/{id}/stock") public ResponseEntity<Void> updateStock( @PathVariable Long id, @RequestParam int quantity) { productService.updateStock(id, quantity); return ResponseEntity.ok().build(); } }
2.2.6 输出适配器(持久化)
// JPA实体 package com.example.demo.adapter.outgoing.persistence.entity; import javax.persistence.*; @Entity @Table(name = "products") public class ProductEntity { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String name; private double price; private int stock; // 构造函数、getter和setter } // JPA仓库 package com.example.demo.adapter.outgoing.persistence.repository; import com.example.demo.adapter.outgoing.persistence.entity.ProductEntity; import org.springframework.data.jpa.repository.JpaRepository; public interface JpaProductRepository extends JpaRepository<ProductEntity, Long> { } // 持久化适配器 package com.example.demo.adapter.outgoing.persistence; import com.example.demo.adapter.outgoing.persistence.entity.ProductEntity; import com.example.demo.adapter.outgoing.persistence.repository.JpaProductRepository; import com.example.demo.domain.model.Product; import com.example.demo.domain.port.outgoing.ProductRepository; import org.springframework.stereotype.Component; import java.util.List; import java.util.Optional; import java.util.stream.Collectors; @Component public class ProductRepositoryAdapter implements ProductRepository { private final JpaProductRepository jpaRepository; public ProductRepositoryAdapter(JpaProductRepository jpaRepository) { this.jpaRepository = jpaRepository; } @Override public List<Product> findAll() { return jpaRepository.findAll().stream() .map(this::mapToDomain) .collect(Collectors.toList()); } @Override public Optional<Product> findById(Long id) { return jpaRepository.findById(id) .map(this::mapToDomain); } @Override public Product save(Product product) { ProductEntity entity = mapToEntity(product); ProductEntity savedEntity = jpaRepository.save(entity); return mapToDomain(savedEntity); } @Override public void deleteById(Long id) { jpaRepository.deleteById(id); } private Product mapToDomain(ProductEntity entity) { Product product = new Product(); product.setId(entity.getId()); product.setName(entity.getName()); product.setPrice(entity.getPrice()); product.setStock(entity.getStock()); return product; } private ProductEntity mapToEntity(Product product) { ProductEntity entity = new ProductEntity(); entity.setId(product.getId()); entity.setName(product.getName()); entity.setPrice(product.getPrice()); entity.setStock(product.getStock()); return entity; } }
2.3 优缺点分析
优点:
- 结构清晰,严格遵循六边形架构原则
- 领域模型完全独立,不受技术框架影响
- 适配器隔离了所有外部依赖
- 高度可测试,可以轻松模拟任何外部组件
缺点:
- 代码量较大,需要编写更多的接口和适配器
- 对象映射工作增加,需要在适配器中转换领域对象和持久化对象
- 可能感觉过度设计,特别是对简单应用程序
- 学习曲线较陡峭,团队需要深入理解六边形架构
2.4 适用场景
- 复杂的业务领域,需要清晰隔离业务规则
- 长期维护的核心系统
- 团队已熟悉六边形架构原则
- 需要灵活替换技术实现的场景
三、基于DDD的六边形架构
3.1 项目结构
基于DDD的六边形架构结合了领域驱动设计的概念,进一步丰富了领域层:
src/main/java/com/example/demo/
├── domain/ # 领域层
│ ├── model/ # 领域模型
│ │ ├── aggregate/ # 聚合
│ │ ├── entity/ # 实体
│ │ └── valueobject/ # 值对象
│ ├── service/ # 领域服务
│ └── repository/ # 仓储接口
├── application/ # 应用层
│ ├── port/ # 应用服务接口
│ │ ├── incoming/ # 输入端口
│ │ └── outgoing/ # 输出端口
│ └── service/ # 应用服务实现
├── infrastructure/ # 基础设施层
│ ├── adapter/ # 适配器
│ │ ├── incoming/ # 输入适配器
│ │ └── outgoing/ # 输出适配器
│ └── config/ # 配置类
└── interface/ # 接口层
├── rest/ # REST接口
├── graphql/ # GraphQL接口
└── scheduler/ # 定时任务
3.2 代码实现
3.2.1 领域模型
// 值对象 package com.example.demo.domain.model.valueobject; public class Money { private final BigDecimal amount; private final String currency; public Money(BigDecimal amount, String currency) { this.amount = amount; this.currency = currency; } public Money add(Money other) { if (!this.currency.equals(other.currency)) { throw new IllegalArgumentException("Cannot add different currencies"); } return new Money(this.amount.add(other.amount), this.currency); } // 其他值对象方法 } // 实体 package com.example.demo.domain.model.entity; import com.example.demo.domain.model.valueobject.Money; public class Product { private ProductId id; private String name; private Money price; private int stock; // 构造函数、getter和setter // 领域行为 public boolean isAvailable() { return stock > 0; } public void decreaseStock(int quantity) { if (quantity > stock) { throw new IllegalArgumentException("Not enough stock"); } this.stock -= quantity; } } // 聚合根 package com.example.demo.domain.model.aggregate; import com.example.demo.domain.model.entity.Product; import com.example.demo.domain.model.valueobject.Money; import java.util.ArrayList; import java.util.List; public class Order { private OrderId id; private CustomerId customerId; private List<OrderLine> orderLines = new ArrayList<>(); private OrderStatus status; private Money totalAmount; // 构造函数、getter和setter // 领域行为 public void addProduct(Product product, int quantity) { if (!product.isAvailable() || product.getStock() < quantity) { throw new IllegalArgumentException("Product not available"); } OrderLine orderLine = new OrderLine(product.getId(), product.getPrice(), quantity); orderLines.add(orderLine); recalculateTotal(); } public void confirm() { if (orderLines.isEmpty()) { throw new IllegalStateException("Cannot confirm empty order"); } this.status = OrderStatus.CONFIRMED; } private void recalculateTotal() { this.totalAmount = orderLines.stream() .map(OrderLine::getSubtotal) .reduce(Money.ZERO, Money::add); } }
3.2.2 领域仓储接口
// 仓储接口 package com.example.demo.domain.repository; import com.example.demo.domain.model.aggregate.Order; import com.example.demo.domain.model.aggregate.OrderId; import java.util.Optional; public interface OrderRepository { Optional<Order> findById(OrderId id); Order save(Order order); void delete(OrderId id); }
3.2.3 应用服务接口
// 应用服务接口 package com.example.demo.application.port.incoming; import com.example.demo.application.dto.OrderRequest; import com.example.demo.application.dto.OrderResponse; import java.util.List; import java.util.Optional; public interface OrderApplicationService { OrderResponse createOrder(OrderRequest request); Optional<OrderResponse> getOrder(String orderId); List<OrderResponse> getCustomerOrders(String customerId); void confirmOrder(String orderId); }
3.2.4 应用服务实现
// 应用服务实现 package com.example.demo.application.service; import com.example.demo.application.dto.OrderRequest; import com.example.demo.application.dto.OrderResponse; import com.example.demo.application.port.incoming.OrderApplicationService; import com.example.demo.application.port.outgoing.ProductRepository; import com.example.demo.domain.model.aggregate.Order; import com.example.demo.domain.model.aggregate.OrderId; import com.example.demo.domain.model.entity.Product; import com.example.demo.domain.repository.OrderRepository; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; import java.util.Optional; import java.util.stream.Collectors; @Service public class OrderApplicationServiceImpl implements OrderApplicationService { private final OrderRepository orderRepository; private final ProductRepository productRepository; public OrderApplicationServiceImpl(OrderRepository orderRepository, ProductRepository productRepository) { this.orderRepository = orderRepository; this.productRepository = productRepository; } @Override @Transactional public OrderResponse createOrder(OrderRequest request) { // 创建订单领域对象 Order order = new Order(new CustomerId(request.getCustomerId())); // 添加产品 for (OrderRequest.OrderItem item : request.getItems()) { Product product = productRepository.findById(new ProductId(item.getProductId())) .orElseThrow(() -> new RuntimeException("Product not found")); order.addProduct(product, item.getQuantity()); // 减少库存 product.decreaseStock(item.getQuantity()); productRepository.save(product); } // 保存订单 Order savedOrder = orderRepository.save(order); // 返回DTO return mapToDto(savedOrder); } @Override public Optional<OrderResponse> getOrder(String orderId) { return orderRepository.findById(new OrderId(orderId)) .map(this::mapToDto); } @Override public List<OrderResponse> getCustomerOrders(String customerId) { return orderRepository.findByCustomerId(new CustomerId(customerId)).stream() .map(this::mapToDto) .collect(Collectors.toList()); } @Override @Transactional public void confirmOrder(String orderId) { Order order = orderRepository.findById(new OrderId(orderId)) .orElseThrow(() -> new RuntimeException("Order not found")); order.confirm(); orderRepository.save(order); } private OrderResponse mapToDto(Order order) { // 映射逻辑 } }
3.2.5 输入适配器(REST控制器)
// REST控制器 package com.example.demo.interface.rest; import com.example.demo.application.dto.OrderRequest; import com.example.demo.application.dto.OrderResponse; import com.example.demo.application.port.incoming.OrderApplicationService; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.*; import java.util.List; @RestController @RequestMapping("/api/orders") public class OrderController { private final OrderApplicationService orderService; public OrderController(OrderApplicationService orderService) { this.orderService = orderService; } @PostMapping public ResponseEntity<OrderResponse> createOrder(@RequestBody OrderRequest request) { OrderResponse response = orderService.createOrder(request); return ResponseEntity.ok(response); } @GetMapping("/{orderId}") public ResponseEntity<OrderResponse> getOrder(@PathVariable String orderId) { return orderService.getOrder(orderId) .map(ResponseEntity::ok) .orElse(ResponseEntity.notFound().build()); } @GetMapping("/customer/{customerId}") public List<OrderResponse> getCustomerOrders(@PathVariable String customerId) { return orderService.getCustomerOrders(customerId); } @PostMapping("/{orderId}/confirm") public ResponseEntity<Void> confirmOrder(@PathVariable String orderId) { orderService.confirmOrder(orderId); return ResponseEntity.ok().build(); } }
3.2.6 输出适配器(JPA持久化)
// JPA实体 package com.example.demo.infrastructure.adapter.outgoing.persistence.entity; import javax.persistence.*; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; @Entity @Table(name = "orders") public class OrderJpaEntity { @Id private String id; private String customerId; @Enumerated(EnumType.STRING) private OrderStatusJpa status; private BigDecimal totalAmount; private String currency; @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true) @JoinColumn(name = "order_id") private List<OrderLineJpaEntity> orderLines = new ArrayList<>(); // 构造函数、getter和setter } // JPA仓库 package com.example.demo.infrastructure.adapter.outgoing.persistence.repository; import com.example.demo.infrastructure.adapter.outgoing.persistence.entity.OrderJpaEntity; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.data.jpa.repository.Query; import java.util.List; public interface OrderJpaRepository extends JpaRepository<OrderJpaEntity, String> { List<OrderJpaEntity> findByCustomerId(String customerId); } // 适配器实现 package com.example.demo.infrastructure.adapter.outgoing.persistence; import com.example.demo.domain.model.aggregate.Order; import com.example.demo.domain.model.aggregate.OrderId; import com.example.demo.domain.model.entity.CustomerId; import com.example.demo.domain.repository.OrderRepository; import com.example.demo.infrastructure.adapter.outgoing.persistence.entity.OrderJpaEntity; import com.example.demo.infrastructure.adapter.outgoing.persistence.repository.OrderJpaRepository; import org.springframework.stereotype.Repository; import java.util.List; import java.util.Optional; import java.util.stream.Collectors; @Repository public class OrderRepositoryAdapter implements OrderRepository { private final OrderJpaRepository jpaRepository; public OrderRepositoryAdapter(OrderJpaRepository jpaRepository) { this.jpaRepository = jpaRepository; } @Override public Optional<Order> findById(OrderId id) { return jpaRepository.findById(id.getValue()) .map(this::mapToDomain); } @Override public Order save(Order order) { OrderJpaEntity entity = mapToJpaEntity(order); OrderJpaEntity savedEntity = jpaRepository.save(entity); return mapToDomain(savedEntity); } @Override public void delete(OrderId id) { jpaRepository.deleteById(id.getValue()); } @Override public List<Order> findByCustomerId(CustomerId customerId) { return jpaRepository.findByCustomerId(customerId.getValue()).stream() .map(this::mapToDomain) .collect(Collectors.toList()); } private Order mapToDomain(OrderJpaEntity entity) { // 映射逻辑 } private OrderJpaEntity mapToJpaEntity(Order order) { // 映射逻辑 } }
3.3 优缺点分析
优点:
- 结合DDD概念,更丰富的领域模型
- 更精确地表达业务规则和约束
- 领域模型与持久化完全分离
- 支持复杂业务场景和领域行为
缺点:
- 架构复杂度进一步增加
- 学习曲线陡峭,需要同时掌握DDD和六边形架构
- 对象映射工作更加繁重
- 可能过度设计,特别是对简单领域
3.4 适用场景
- 复杂业务领域,有丰富的业务规则和约束
- 大型企业应用,特别是核心业务系统
- 团队熟悉DDD和六边形架构
- 长期维护的系统,需要适应业务变化
四、简化版架构实现
4.1 项目结构
简化架构采用更轻量级的方式实现六边形架构的核心理念,减少接口数量,简化层次结构:
src/main/java/com/example/demo/
├── service/ # 服务层
│ ├── business/ # 业务服务
│ ├── model/ # 数据模型
│ └── exception/ # 业务异常
├── integration/ # 集成层
│ ├── database/ # 数据库集成
│ ├── messaging/ # 消息集成
│ └── external/ # 外部服务集成
├── web/ # Web层
│ ├── controller/ # 控制器
│ ├── dto/ # 数据传输对象
│ └── advice/ # 全局异常处理
└── config/ # 配置
4.2 代码实现
4.2.1 数据模型
// 业务模型 package com.example.demo.service.model; import lombok.Data; @Data public class Product { private Long id; private String name; private double price; private int stock; // 业务逻辑直接在模型中 public boolean isAvailable() { return stock > 0; } public void decreaseStock(int quantity) { if (quantity > stock) { throw new IllegalArgumentException("Not enough stock"); } this.stock -= quantity; } }
4.2.2 集成层接口
// 数据库集成接口 package com.example.demo.integration.database; import com.example.demo.service.model.Product; import java.util.List; import java.util.Optional; // 没有复杂的端口和适配器分离,直接定义操作接口 public interface ProductRepository { List<Product> findAll(); Optional<Product> findById(Long id); Product save(Product product); void deleteById(Long id); }
4.2.3 业务服务
// 业务服务 package com.example.demo.service.business; import com.example.demo.integration.database.ProductRepository; import com.example.demo.service.model.Product; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; import java.util.Optional; @Service public class ProductService { private final ProductRepository productRepository; // 直接注入所需依赖 public ProductService(ProductRepository productRepository) { this.productRepository = productRepository; } public List<Product> getAllProducts() { return productRepository.findAll(); } public Optional<Product> getProductById(Long id) { return productRepository.findById(id); } public Product createProduct(Product product) { return productRepository.save(product); } @Transactional public void updateStock(Long productId, int quantity) { Product product = productRepository.findById(productId) .orElseThrow(() -> new RuntimeException("Product not found")); product.decreaseStock(quantity); productRepository.save(product); } }
4.2.4 控制器
// REST控制器 package com.example.demo.web.controller; import com.example.demo.service.business.ProductService; import com.example.demo.service.model.Product; import com.example.demo.web.dto.ProductDTO; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.*; import java.util.List; import java.util.stream.Collectors; @RestController @RequestMapping("/api/products") public class ProductController { private final ProductService productService; public ProductController(ProductService productService) { this.productService = productService; } @GetMapping public List<ProductDTO> getAllProducts() { return productService.getAllProducts().stream() .map(this::toDto) .collect(Collectors.toList()); } @GetMapping("/{id}") public ResponseEntity<ProductDTO> getProductById(@PathVariable Long id) { return productService.getProductById(id) .map(this::toDto) .map(ResponseEntity::ok) .orElse(ResponseEntity.notFound().build()); } @PostMapping public ProductDTO createProduct(@RequestBody ProductDTO productDto) { Product product = toEntity(productDto); return toDto(productService.createProduct(product)); } @PutMapping("/{id}/stock") public ResponseEntity<Void> updateStock( @PathVariable Long id, @RequestParam int quantity) { productService.updateStock(id, quantity); return ResponseEntity.ok().build(); } private ProductDTO toDto(Product product) { ProductDTO dto = new ProductDTO(); dto.setId(product.getId()); dto.setName(product.getName()); dto.setPrice(product.getPrice()); dto.setStock(product.getStock()); return dto; } private Product toEntity(ProductDTO dto) { Product product = new Product(); product.setId(dto.getId()); product.setName(dto.getName()); product.setPrice(dto.getPrice()); product.setStock(dto.getStock()); return product; } }
4.2.5 数据库实现
// JPA实体 - 与业务模型类似 package com.example.demo.integration.database.entity; import lombok.Data; import javax.persistence.*; @Entity @Table(name = "products") @Data public class ProductEntity { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String name; private double price; private int stock; } // JPA仓库 package com.example.demo.integration.database.repository; import com.example.demo.integration.database.entity.ProductEntity; import org.springframework.data.jpa.repository.JpaRepository; public interface JpaProductRepository extends JpaRepository<ProductEntity, Long> { } // 仓库实现 package com.example.demo.integration.database; import com.example.demo.integration.database.entity.ProductEntity; import com.example.demo.integration.database.repository.JpaProductRepository; import com.example.demo.service.model.Product; import org.springframework.stereotype.Repository; import java.util.List; import java.util.Optional; import java.util.stream.Collectors; @Repository public class ProductRepositoryImpl implements ProductRepository { private final JpaProductRepository jpaRepository; public ProductRepositoryImpl(JpaProductRepository jpaRepository) { this.jpaRepository = jpaRepository; } @Override public List<Product> findAll() { return jpaRepository.findAll().stream() .map(this::toModel) .collect(Collectors.toList()); } @Override public Optional<Product> findById(Long id) { return jpaRepository.findById(id) .map(this::toModel); } @Override public Product save(Product product) { ProductEntity entity = toEntity(product); return toModel(jpaRepository.save(entity)); } @Override public void deleteById(Long id) { jpaRepository.deleteById(id); } private Product toModel(ProductEntity entity) { Product product = new Product(); product.setId(entity.getId()); product.setName(entity.getName()); product.setPrice(entity.getPrice()); product.setStock(entity.getStock()); return product; } private ProductEntity toEntity(Product product) { ProductEntity entity = new ProductEntity(); entity.setId(product.getId()); entity.setName(product.getName()); entity.setPrice(product.getPrice()); entity.setStock(product.getStock()); return entity; } }
4.3 优缺点分析
优点:
- 结构简单,学习曲线平缓
- 减少了接口和层次数量,代码量更少
- 遵循Spring框架惯例,对Spring开发者友好
- 开发效率高,适合快速迭代
- 仍然保持了业务逻辑和外部依赖的基本分离
缺点:
- 分离不如经典六边形架构严格
- 业务逻辑可能会混入非核心关注点
- 领域模型不够丰富
- 对复杂业务场景支持有限
4.4 适用场景
- 中小型应用,业务逻辑相对简单
- 需要快速开发和迭代的项目
- 原型或MVP开发
- 启动阶段的项目,后期可能演进到更严格的架构
五、总结
六边形架构的核心价值在于将业务逻辑与技术细节分离,提高系统的可维护性、可测试性和灵活性。
无论选择哪种实现方式,都应该坚持这一核心原则,保持领域模型的纯粹性和边界的清晰性。
需要特别说明的是,架构应该服务于业务,而非相反。选择合适的架构方式,应以提高开发效率、系统质量和业务适应性为目标。
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