Designing Hexagonal Architecture With Java Pdf Free 2021 Repack Download

package com.bank.adapters.outbound; import com.bank.domain.model.Account; import com.bank.ports.outbound.AccountRepositoryPort; import org.springframework.stereotype.Component; import java.util.UUID; @Component public class AccountPersistenceAdapter implements AccountRepositoryPort private final SpringDataAccountRepository repository; public AccountPersistenceAdapter(SpringDataAccountRepository repository) this.repository = repository; @Override public Account load(UUID accountId) AccountEntity entity = repository.findById(accountId) .orElseThrow(() -> new RuntimeException("Account not found")); return new Account(entity.getId(), entity.getBalance()); @Override public void save(Account account) AccountEntity entity = new AccountEntity(account.getAccountId(), account.getBalance()); repository.save(entity); Use code with caution. Organizing Package Structures

🛠️ Structuring a Java Project for Hexagonal Architecture

The domain service implements the inbound port and orchestrates the business operation using the outbound port. package com

Rely on tools like MapStruct to automate transformations between domain models and database entity objects. This significantly reduces manual mapping boilerplate code.

If your team decides to migrate from SQL to a NoSQL database, you only rewrite the Secondary Adapter layer. The core application logic remains untouched, un-retested, and completely safe. This significantly reduces manual mapping boilerplate code

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).

┌───────────────────────────────────────────────────────────────┐ │ OUTSIDE WORLD (Adapters) │ │ │ │ ┌───────────────┐ ┌───────────────┐ │ │ │ Web Controller│ ───> │ Inbound Port │ │ │ └───────────────┘ └───────────────┘ │ │ │ │ │ ▼ ▼ │ │ ┌───────────────────────┐ │ │ │ APPLICATION │ │ │ │ CORE │ │ │ │ (Business Logic / │ │ │ │ Domain Models) │ │ │ └───────────────────────┘ │ │ │ │ │ ▼ ▼ │ │ ┌───────────────┐ ┌───────────────┐ │ │ │ Database Impl │ <─── │ Outbound Port │ │ │ └───────────────┘ └───────────────┘ │ └───────────────────────────────────────────────────────────────┘ Pillar 1: The Core (Domain & Application Service) Coined by Alistair Cockburn

Designing Hexagonal Architecture with Java (Davi Vieira, 2021)

To ensure your Java architecture remains cleanly decoupled, follow these validation rules: