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Merged
JerrettDavis merged 2 commits into from
Oct 8, 2025
Merged

Feature/22 fluent create proxy pattern #51

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741642a
test(proxy): add coverage for parameterless ProxyDemo wrapper methods
JerrettDavis Oct 8, 2025
71607fb
feat(proxy): implements proxy pattern
JerrettDavis Oct 8, 2025
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59 changes: 58 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -386,12 +386,69 @@ var apiFacade = Facade<string, string>.Create()
var status = apiFacade.Execute("STATUS", ""); // Works with any casing
```

### Proxy (access control & lazy initialization)
```csharp
using PatternKit.Structural.Proxy;

// Virtual Proxy - lazy initialization
var dbProxy = Proxy<string, string>.Create()
.VirtualProxy(() => {
var db = new ExpensiveDatabase("connection-string");
return sql => db.Query(sql);
})
.Build();
// Database not created until first Execute call
var result = dbProxy.Execute("SELECT * FROM Users");

// Protection Proxy - access control
var deleteProxy = Proxy<User, bool>.Create(user => DeleteUser(user))
.ProtectionProxy(user => user.IsAdmin)
.Build();
deleteProxy.Execute(regularUser); // Throws UnauthorizedAccessException

// Caching Proxy - memoization
var cachedCalc = Proxy<int, int>.Create(x => ExpensiveFibonacci(x))
.CachingProxy()
.Build();
cachedCalc.Execute(100); // Calculates
cachedCalc.Execute(100); // Returns cached result

// Logging Proxy - audit trail
var loggedOp = Proxy<Payment, bool>.Create(p => ProcessPayment(p))
.LoggingProxy(msg => logger.Log(msg))
.Build();

// Custom Interception - retry logic
var retryProxy = Proxy<string, string>.Create(CallUnreliableService)
.Intercept((input, next) => {
for (int i = 0; i < 3; i++) {
try { return next(input); }
catch (Exception) when (i < 2) { Thread.Sleep(1000); }
}
throw new Exception("Max retries exceeded");
})
.Build();

// Remote Proxy - combine caching + logging
var remoteProxy = Proxy<int, string>.Create(id => CallRemoteApi(id))
.Intercept((id, next) => {
logger.Log($"Request for ID: {id}");
var result = next(id);
logger.Log("Response received");
return result;
})
.Build();
var cachedRemoteProxy = Proxy<int, string>.Create(id => remoteProxy.Execute(id))
.CachingProxy()
.Build();
```

---

## 📚 Patterns Table
| Category | Patterns ✓ = implemented |
| -------------- |--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Creational** | [Factory](docs/patterns/creational/factory/factory.md) ✓ • [Composer](docs/patterns/creational/builder/composer.md) ✓ • [ChainBuilder](docs/patterns/creational/builder/chainbuilder.md) ✓ • [BranchBuilder](docs/patterns/creational/builder/chainbuilder.md) ✓ • [MutableBuilder](docs/patterns/creational/builder/mutablebuilder.md) ✓ • [Prototype](docs/patterns/creational/prototype/prototype.md) ✓ • [Singleton](docs/patterns/creational/singleton/singleton.md) ✓ |
| **Structural** | [Adapter](docs/patterns/structural/adapter/fluent-adapter.md) ✓ • [Bridge](docs/patterns/structural/bridge/bridge.md) ✓ • [Composite](docs/patterns/structural/composite/composite.md) ✓ • [Decorator](docs/patterns/structural/decorator/decorator.md) ✓ • [Facade](docs/patterns/structural/facade/facade.md) ✓ • Flyweight (planned) • Proxy (planned) |
| **Structural** | [Adapter](docs/patterns/structural/adapter/fluent-adapter.md) ✓ • [Bridge](docs/patterns/structural/bridge/bridge.md) ✓ • [Composite](docs/patterns/structural/composite/composite.md) ✓ • [Decorator](docs/patterns/structural/decorator/decorator.md) ✓ • [Facade](docs/patterns/structural/facade/facade.md) ✓ • Flyweight (planned) • [Proxy](docs/patterns/structural/proxy/index.md) ✓ |
| **Behavioral** | [Strategy](docs/patterns/behavioral/strategy/strategy.md) ✓ • [TryStrategy](docs/patterns/behavioral/strategy/trystrategy.md) ✓ • [ActionStrategy](docs/patterns/behavioral/strategy/actionstrategy.md) ✓ • [ActionChain](docs/patterns/behavioral/chain/actionchain.md) ✓ • [ResultChain](docs/patterns/behavioral/chain/resultchain.md) ✓ • [ReplayableSequence](docs/patterns/behavioral/iterator/replayablesequence.md) ✓ • [WindowSequence](docs/patterns/behavioral/iterator/windowsequence.md) ✓ • [Command](docs/patterns/behavioral/command/command.md) ✓ • [Mediator](docs/patterns/behavioral/mediator/mediator.md) ✓ • Memento (planned) • Observer (planned) • State (planned) • Template Method (planned) • Visitor (planned) |

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