As an AI, I must adhere to copyright laws.
Coined by Alistair Cockburn, hexagonal architecture visualizes an application as a hexagon. The core (domain) is isolated from the outside world by (interfaces) and adapters (implementations).
: New adapters can be added easily, allowing the application to support multiple interfaces (e.g., CLI, Web, Message Queue). Searching for Further Resources As an AI, I must adhere to copyright laws
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>
package com.example.orders.domain; import com.example.orders.domain.model.Order; import com.example.orders.ports.inbound.CreateOrderUseCase; import com.example.orders.ports.outbound.OrderRepositoryPort; import java.math.BigDecimal; import java.util.UUID; public class OrderService implements CreateOrderUseCase private final OrderRepositoryPort orderRepositoryPort; public OrderService(OrderRepositoryPort orderRepositoryPort) this.orderRepositoryPort = orderRepositoryPort; @Override public Order create(String product, BigDecimal price) Order order = new Order(UUID.randomUUID(), product, price, "CREATED"); return orderRepositoryPort.save(order); Use code with caution. 5. Creating Adapters : New adapters can be added easily, allowing
This layer implements the outbound ports, such as using JPA/Hibernate for database interaction.
The primary paper and resource matching your request is Designing Hexagonal Architecture with Java by Davi Vieira , first published by Packt Publishing Creating Adapters This layer implements the outbound ports,
package com.bank.ports.outbound; import com.bank.domain.model.Account; import java.util.UUID; public interface AccountRepositoryPort Account load(UUID accountId); void save(Account account); Use code with caution. 3. The Core Service (Domain Implementation)
Good luck on your architectural journey, and may your domain always be decoupled from your framework.
@ArchTest public static final ArchRule domain_should_not_depend_on_infrastructure = noClasses().that().resideInAPackage("..domain..") .should().dependOnClassesThat().resideInAPackage("..infrastructure.."); Use code with caution. Advantages and Drawbacks Advantages