platform/docs/pipeline_gap_analysis.md

# Pipeline Package Gap Analysis

## Overview

This document analyzes the gaps between our Pipeline package's actual implementation and our documentation, identifying areas that need implementation or documentation updates.

> **Related Documentation**
> - See [Pipeline Package Specification](pipeline_package_specification.md) for current implementation
> - See [Laravel Compatibility Roadmap](laravel_compatibility_roadmap.md) for overall status
> - See [Foundation Integration Guide](foundation_integration_guide.md) for integration patterns
> - See [Testing Guide](testing_guide.md) for testing approaches
> - See [Getting Started Guide](getting_started.md) for development setup

## Implementation Gaps

### 1. Missing Laravel Features
```dart
// Documented but not implemented:

// 1. Pipeline Hub
class PipelineHub {
  // Need to implement:
  Pipeline pipeline(String name);
  void defaults(List<Pipe> pipes);
  Pipeline middleware();
  Pipeline bus();
}

// 2. Pipeline Conditions
class Pipeline {
  // Need to implement:
  Pipeline when(bool Function() callback);
  Pipeline unless(bool Function() callback);
  Pipeline whenCallback(Function callback);
}

// 3. Pipeline Caching
class Pipeline {
  // Need to implement:
  void enableCache();
  void clearCache();
  dynamic getCached(String key);
}
```

### 2. Existing Features Not Documented

```dart
// Implemented but not documented:

// 1. Type Registration
class Pipeline {
  /// Registers pipe types for string resolution
  void registerPipeType(String name, Type type);
  
  /// Type map for string resolution
  final Map<String, Type> _typeMap = {};
}

// 2. Method Invocation
class Pipeline {
  /// Invokes methods on pipe instances
  Future<dynamic> invokeMethod(
    dynamic instance,
    String methodName,
    List<dynamic> arguments
  );
  
  /// Sets method to call on pipes
  Pipeline via(String method);
}

// 3. Exception Handling
class Pipeline {
  /// Logger for pipeline
  final Logger _logger;
  
  /// Handles exceptions in pipeline
  dynamic handleException(dynamic passable, Object e);
}
```

### 3. Integration Points Not Documented

```dart
// 1. Container Integration
class Pipeline {
  /// Container reference
  final Container? _container;
  
  /// Gets container instance
  Container getContainer();
  
  /// Sets container instance
  Pipeline setContainer(Container container);
}

// 2. Reflection Integration
class Pipeline {
  /// Resolves pipe types using mirrors
  Type? _resolvePipeType(String pipeClass) {
    try {
      for (var lib in currentMirrorSystem().libraries.values) {
        // Reflection logic...
      }
    } catch (_) {}
  }
}

// 3. Logging Integration
class Pipeline {
  /// Logger instance
  final Logger _logger;
  
  /// Logs pipeline events
  void _logPipelineEvent(String message, [Object? error]);
}
```

## Documentation Gaps

### 1. Missing API Documentation

```dart
// Need to document:

/// Registers a pipe type for string resolution.
/// 
/// This allows pipes to be specified by string names in the through() method.
/// 
/// Example:
/// ```dart
/// pipeline.registerPipeType('auth', AuthMiddleware);
/// pipeline.through(['auth']);
/// ```
void registerPipeType(String name, Type type);

/// Sets the method to be called on pipe instances.
///
/// By default, the 'handle' method is called. This method allows
/// customizing which method is called on each pipe.
///
/// Example:
/// ```dart
/// pipeline.via('process').through([MyPipe]);
/// // Will call process() instead of handle()
/// ```
Pipeline via(String method);
```

### 2. Missing Integration Examples

```dart
// Need examples for:

// 1. Container Integration
var pipeline = Pipeline(container)
  ..through([
    AuthMiddleware,
    container.make<LoggingMiddleware>(),
    'validation' // Resolved from container
  ]);

// 2. Exception Handling
pipeline.through([
  (passable, next) async {
    try {
      return await next(passable);
    } catch (e) {
      logger.error('Pipeline error', e);
      throw PipelineException(e.toString());
    }
  }
]);

// 3. Method Customization
pipeline.via('process')
  .through([
    ProcessingPipe(), // Will call process() instead of handle()
    ValidationPipe()
  ]);
```

### 3. Missing Test Coverage

```dart
// Need tests for:

void main() {
  group('Type Registration', () {
    test('resolves string pipes to types', () {
      var pipeline = Pipeline(container);
      pipeline.registerPipeType('auth', AuthMiddleware);
      
      await pipeline
        .through(['auth'])
        .send(request)
        .then(handler);
        
      verify(() => container.make<AuthMiddleware>()).called(1);
    });
  });
  
  group('Method Invocation', () {
    test('calls custom methods on pipes', () {
      var pipeline = Pipeline(container);
      var pipe = MockPipe();
      
      await pipeline
        .via('process')
        .through([pipe])
        .send(data)
        .then(handler);
        
      verify(() => pipe.process(any, any)).called(1);
    });
  });
}
```

## Implementation Priority

1. **High Priority**
   - Pipeline hub (Laravel compatibility)
   - Pipeline conditions (Laravel compatibility)
   - Better exception handling

2. **Medium Priority**
   - Pipeline caching
   - Better type resolution
   - Performance optimizations

3. **Low Priority**
   - Additional helper methods
   - Extended testing utilities
   - Debug/profiling tools

## Next Steps

1. **Implementation Tasks**
   - Add pipeline hub
   - Add pipeline conditions
   - Add caching support
   - Improve exception handling

2. **Documentation Tasks**
   - Document type registration
   - Document method invocation
   - Document exception handling
   - Add integration examples

3. **Testing Tasks**
   - Add type registration tests
   - Add method invocation tests
   - Add exception handling tests
   - Add integration tests

Would you like me to:
1. Start implementing missing features?
2. Update documentation for existing features?
3. Create test cases for missing coverage?

## Development Guidelines

### 1. Getting Started
Before implementing pipeline features:
1. Review [Getting Started Guide](getting_started.md)
2. Check [Laravel Compatibility Roadmap](laravel_compatibility_roadmap.md)
3. Follow [Testing Guide](testing_guide.md)
4. Use [Foundation Integration Guide](foundation_integration_guide.md)
5. Review [Pipeline Package Specification](pipeline_package_specification.md)

### 2. Implementation Process
For each pipeline feature:
1. Write tests following [Testing Guide](testing_guide.md)
2. Implement following Laravel patterns
3. Document following [Getting Started Guide](getting_started.md#documentation)
4. Integrate following [Foundation Integration Guide](foundation_integration_guide.md)

### 3. Quality Requirements
All implementations must:
1. Pass all tests (see [Testing Guide](testing_guide.md))
2. Meet Laravel compatibility requirements
3. Follow integration patterns (see [Foundation Integration Guide](foundation_integration_guide.md))
4. Match specifications in [Pipeline Package Specification](pipeline_package_specification.md)

### 4. Integration Considerations
When implementing pipeline features:
1. Follow patterns in [Foundation Integration Guide](foundation_integration_guide.md)
2. Ensure Laravel compatibility per [Laravel Compatibility Roadmap](laravel_compatibility_roadmap.md)
3. Use testing approaches from [Testing Guide](testing_guide.md)
4. Follow development setup in [Getting Started Guide](getting_started.md)

### 5. Performance Guidelines
Pipeline system must:
1. Handle nested pipelines efficiently
2. Minimize memory usage in long pipelines
3. Support async operations
4. Scale with number of stages
5. Meet performance targets in [Laravel Compatibility Roadmap](laravel_compatibility_roadmap.md#performance-benchmarks)

### 6. Testing Requirements
Pipeline tests must:
1. Cover all pipeline types
2. Test stage ordering
3. Verify error handling
4. Check conditional execution
5. Follow patterns in [Testing Guide](testing_guide.md)

### 7. Documentation Requirements
Pipeline documentation must:
1. Explain pipeline patterns
2. Show integration examples
3. Cover error handling
4. Include performance tips
5. Follow standards in [Getting Started Guide](getting_started.md#documentation)