Designing Hexagonal Architecture With Java Pdf < Must Watch >

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).

Driving Adapter (REST) → Incoming Port (Interface) → Application Service → Outgoing Port (Interface) ← Driven Adapter (JPA) designing hexagonal architecture with java pdf

@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; Instead of a traditional layered architecture (where the

// 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); var money = new Money(command.price()

@PostMapping("/products") public Product createProduct(@RequestBody CreateProductCommand command) return createProductUseCase.execute(command);

In traditional layered architecture: Web → Service → Repository → Database