Adapter Pattern Generator
Creates Adapter pattern infrastructure for converting incompatible interfaces into expected ones.
When to Use
| Scenario | Example |
|---|---|
| Legacy code integration | Wrap old API with new interface |
| Third-party library wrapping | Stripe SDK, AWS SDK adapters |
| Interface standardization | Multiple payment gateways with unified interface |
| Backward compatibility | Support old and new interfaces |
Component Characteristics
Target Interface
- Defines expected operations
- Client code depends on this
- Domain layer contract
Adapter
- Implements target interface
- Wraps adaptee (existing class)
- Translates calls between interfaces
Adaptee
- Existing incompatible class
- Legacy code or external library
- Not modified by adapter
Generation Process
Step 1: Generate Target Interface
Path: src/Domain/{BoundedContext}/
{Name}Interface.php— Expected interface contract
Step 2: Generate Adapter
Path: src/Infrastructure/{BoundedContext}/Adapter/
{Provider}{Name}Adapter.php— Converts adaptee to target interface{Legacy}{Name}Adapter.php— Wraps legacy code{External}{Name}Adapter.php— Wraps third-party library
Step 3: Generate Tests
{AdapterName}Test.php— Adapter behavior verification
File Placement
| Component | Path |
|---|---|
| Target Interface | src/Domain/{BoundedContext}/ |
| Adapter | src/Infrastructure/{BoundedContext}/Adapter/ |
| Adaptee (existing) | External library or legacy code |
| Unit Tests | tests/Unit/Infrastructure/{BoundedContext}/Adapter/ |
Naming Conventions
| Component | Pattern | Example |
|---|---|---|
| Target Interface | {Name}Interface |
PaymentGatewayInterface |
| Adapter | {Provider}{Name}Adapter |
StripePaymentGatewayAdapter |
| Test | {ClassName}Test |
StripePaymentGatewayAdapterTest |
Quick Template Reference
Target Interface
interface {Name}Interface
{
public function {operation}({params}): {returnType};
}
Adapter
final readonly class {Provider}{Name}Adapter implements {Name}Interface
{
public function __construct(
private {Adaptee} $adaptee
) {}
public function {operation}({params}): {returnType}
{
// Translate params to adaptee format
$adapteeResult = $this->adaptee->{adapteeMethod}({adapteeParams});
// Convert result to target format
return {convertedResult};
}
}
Usage Example
// Stripe SDK is the adaptee
$stripeClient = new \Stripe\StripeClient($apiKey);
// Adapter makes it compatible with our interface
$paymentGateway = new StripePaymentGatewayAdapter($stripeClient);
// Use through our domain interface
$result = $paymentGateway->charge($amount, $token);
Common Adapters
| Adapter | Purpose |
|---|---|
| PaymentGatewayAdapter | Wrap Stripe, PayPal, Square APIs |
| StorageAdapter | Wrap AWS S3, Google Cloud Storage |
| MessengerAdapter | Wrap Slack, Discord, Telegram APIs |
| EmailAdapter | Wrap SendGrid, Mailgun, AWS SES |
| CacheAdapter | Wrap Redis, Memcached, APCu |
| LoggerAdapter | Wrap Monolog, Syslog, custom loggers |
Anti-patterns to Avoid
| Anti-pattern | Problem | Solution |
|---|---|---|
| Leaky Adapter | Exposing adaptee details | Return only target interface types |
| Multiple Responsibilities | Adapter doing business logic | Keep adapters focused on translation |
| Tight Coupling | Adapter depends on concrete adaptee | Accept interface when possible |
| Heavy Translation | Complex conversions in adapter | Extract translator services |
| Missing Error Handling | Adaptee exceptions leak | Catch and convert to domain exceptions |
References
For complete PHP templates and examples, see:
references/templates.md— Target Interface, Adapter templates for payment, storage, messagingreferences/examples.md— Stripe, PayPal, AWS S3, legacy user adapters with unit tests
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