Anti-Corruption Layer Generator

Generate DDD-compliant Anti-Corruption Layer (ACL) components for isolating bounded contexts and integrating with external/legacy systems.

When to Use

Scenario	Example
Legacy system integration	ERP, CRM, mainframe
Third-party API integration	Payment gateway, shipping API
Bounded context communication	Order ↔ Inventory contexts
Database migration	Old schema → new domain model
Microservice integration	External service with different model

Anti-Corruption Layer Characteristics

• Isolation: Protects domain model from external/foreign concepts
• Translation: Converts between domain and external models
• Facade: Provides simplified interface to external systems
• Adapter: Implements domain ports using external services
• No Domain Leakage: External concepts never enter domain layer
• Bidirectional: Can translate both inbound and outbound

---

ACL Architecture

YOUR BOUNDED CONTEXT
├── DOMAIN LAYER
│   └── Port (Interface) ←────────────┐
│                                      │
├── ANTI-CORRUPTION LAYER             │
│   ├── Adapter (implements Port) ────┘
│   ├── Translator (Domain ↔ External)
│   ├── Facade (External system wrapper)
│   └── External DTOs
│
└── EXTERNAL SYSTEM (Legacy, API, other bounded context)

---

Generation Process

Step 1: Generate Domain Port

Path: src/Domain/{BoundedContext}/Port/

1. {ExternalSystem}PortInterface.php — Domain interface for external system

Step 2: Generate External DTOs

Path: src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/DTO/

1. {ExternalSystem}{Concept}DTO.php — DTOs matching external format

Step 3: Generate Translator

Path: src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/

1. {ExternalSystem}Translator.php — Domain ↔ External conversion

Step 4: Generate Facade

Path: src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/

1. {ExternalSystem}Facade.php — Simplified external system interface

Step 5: Generate Adapter

Path: src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/

1. {ExternalSystem}Adapter.php — Implements domain port

Step 6: Generate Exceptions

Path: src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/Exception/

1. {ExternalSystem}Exception.php — Domain exception
2. {ExternalSystem}ConnectionException.php — Infrastructure exception

Step 7: Generate Tests

1. {ExternalSystem}TranslatorTest.php — Translation tests
2. {ExternalSystem}AdapterTest.php — Adapter integration tests

---

File Placement

Component	Path
Domain Port	src/Domain/{BoundedContext}/Port/{ExternalSystem}PortInterface.php
External DTO	src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/DTO/
Translator	src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/{ExternalSystem}Translator.php
Facade	src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/{ExternalSystem}Facade.php
Adapter	src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/{ExternalSystem}Adapter.php
Exceptions	src/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/Exception/
Tests	tests/Unit/Infrastructure/{BoundedContext}/ACL/{ExternalSystem}/

---

Naming Conventions

Component	Pattern	Example
Port	{ExternalSystem}PortInterface	PaymentGatewayPortInterface
DTO	{ExternalSystem}{Concept}DTO	StripeChargeDTO
Translator	{ExternalSystem}Translator	StripeTranslator
Facade	{ExternalSystem}Facade	StripeFacade
Adapter	{ExternalSystem}Adapter	StripeAdapter
Exception	{ExternalSystem}Exception	StripeException

---

Quick Template Reference

Domain Port

interface {ExternalSystem}PortInterface
{
    public function {operation}({DomainParameters}): {DomainReturnType};
}

Translator

final readonly class {ExternalSystem}Translator
{
    public function toDomain({ExternalSystem}DTO $dto): {Entity};
    public function toExternal({Entity} $entity): {ExternalSystem}DTO;
}

Adapter

final readonly class {ExternalSystem}Adapter implements {ExternalSystem}PortInterface
{
    public function __construct(
        private {ExternalSystem}Facade $facade,
        private {ExternalSystem}Translator $translator,
    ) {}

    public function {operation}({DomainParameters}): {DomainReturnType}
    {
        $dto = $this->translator->toExternal($entity);
        $result = $this->facade->{externalOperation}($dto);
        return $this->translator->toDomain($result);
    }
}

---

Usage Example

// Domain port interface
interface PaymentGatewayPortInterface
{
    public function charge(Payment $payment): PaymentId;
    public function refund(PaymentId $paymentId, Money $amount): void;
}

// Adapter implementation
final readonly class StripeAdapter implements PaymentGatewayPortInterface
{
    public function charge(Payment $payment): PaymentId
    {
        $stripeCharge = $this->translator->toStripeCharge($payment);
        $result = $this->facade->createCharge($stripeCharge);
        return $this->translator->toPaymentId($result);
    }
}

---

Anti-patterns to Avoid

Anti-pattern	Problem	Solution
Domain using external DTOs	External concepts leak into domain	Always translate at ACL boundary
Translator in domain layer	Infrastructure concern in domain	Keep translator in infrastructure
Exposing external exceptions	Coupling to external system	Wrap in domain exceptions
Direct API calls from domain	No isolation	Use port/adapter pattern
Shared DTOs across ACLs	Coupling between integrations	Each ACL has own DTOs
Business logic in translator	Wrong responsibility	Translator only maps data

---

DI Configuration

# services.yaml
Domain\Payment\Port\PaymentGatewayPortInterface:
    alias: Infrastructure\Payment\ACL\Stripe\StripeAdapter

Infrastructure\Payment\ACL\Stripe\StripeFacade:
    arguments:
        $client: '@stripe.client'

---

References

For complete PHP templates and examples, see:

• references/templates.md — Domain Port, External DTO, Translator, Facade, Adapter, Exception templates
• references/examples.md — Stripe Payment Gateway ACL complete example and tests