Designing Hexagonal Architecture With Java Pdf 〈2025〉

// 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

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). designing hexagonal architecture with java pdf

// application/service/CreateProductService.java package com.example.application.service; import com.example.application.port.in.CreateProductUseCase; import com.example.domain.model.Money; import com.example.domain.model.Product; import com.example.domain.spi.ProductRepository; import lombok.RequiredArgsConstructor; // adapters/web/ProductController

private Product toDomain(ProductJpaEntity entity) ... var money = new Money(command.price()

@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;

// application/port/in/CreateProductUseCase.java (Incoming Port) package com.example.application.port.in; import com.example.domain.model.Product; public interface CreateProductUseCase { Product execute(CreateProductCommand command);

@Override public Optional<Product> findById(String id) return jpaRepository.findById(id).map(this::toDomain);