@Override public Product execute(CreateProductCommand command) var id = UUID.randomUUID().toString(); var money = new Money(command.price(), command.currency()); var product = new Product(id, command.name(), money); productRepository.save(product); return product;
// adapters/web/ProductController.java package com.example.adapters.web; import com.example.application.port.in.CreateProductUseCase; import com.example.application.port.in.CreateProductUseCase.CreateProductCommand; import com.example.domain.model.Product; import lombok.RequiredArgsConstructor; import org.springframework.web.bind.annotation.*; @RestController @RequiredArgsConstructor public class ProductController private final CreateProductUseCase createProductUseCase; // depends on incoming port designing hexagonal architecture with java pdf
Driving Adapter (REST) → Incoming Port (Interface) → Application Service → Outgoing Port (Interface) ← Driven Adapter (JPA) var money = new Money(command.price()
Instead of a traditional layered architecture (where the UI depends on Business depends on Data), Hexagonal Architecture places the at the center. External systems interact with the domain through ports (interfaces) and adapters (implementations). var product = new Product(id
@RequiredArgsConstructor public class CreateProductService implements CreateProductUseCase private final ProductRepository productRepository; // depends on outgoing port
// domain/spi/ProductRepository.java (Outgoing Port) package com.example.domain.spi; import com.example.domain.model.Product; import java.util.Optional;