Designing Hexagonal Architecture with Java, published by Packt
: Swap out Spring Boot, Quarkus, or databases without altering core logic. If you decide to switch your Relational Database
Absolutely. In fact, the 2021 book uses Java and Quarkus specifically. Quarkus's dependency injection and native compilation features work perfectly with hexagonal principles. The book details how to implement Quarkus DI to manage the lifecycle of input and output ports. : REST controllers
The primary goal is to create an application where the "Domain" is the and the "Technology" is the slave . If you decide to switch your Relational Database (RDBMS) for a NoSQL alternative or move from REST to gRPC, you should be able to do so without touching a single line of the code that runs your business. private long idSequence = 1
package adapter.outbound; import domain.model.User; import domain.port.outbound.UserRepositoryPort; import java.util.HashMap; import java.util.Map; public class InMemoryUserRepositoryAdapter implements UserRepositoryPort private final Map database = new HashMap<>(); private long idSequence = 1; @Override public User save(User user) User savedUser = new User(idSequence++, user.getName(), user.getEmail()); database.put(savedUser.getId(), savedUser); return savedUser; Use code with caution. Benefits of this Design
Probably not. Sites like Trakteer or Sciarium that offer unauthorized PDFs of copyrighted books are usually violating intellectual property laws. While they may exist, downloading them supports piracy. Use the official free resources (Code, Color Images, O'Reilly Preview) listed in this article instead.
: REST controllers, CLI tools, or message queue listeners that call inbound ports.
