Transform Node Implementation

This document describes the implementation details of transform nodes in the Floxide framework.

Overview

Transform nodes in Floxide provide a functional approach to data transformation with explicit input and output types, proper error handling, and a three-phase lifecycle.

Core Components

TransformNode Trait

The TransformNode trait defines the core interface for data transformation:

#[async_trait]
pub trait TransformNode<Input, Output, Error>: Send + Sync
where
    Input: Send + Sync + 'static,
    Output: Send + Sync + 'static,
    Error: std::error::Error + Send + Sync + 'static,
{
    async fn prep(&self, input: Input) -> Result<Input, Error>;
    async fn exec(&self, input: Input) -> Result<Output, Error>;
    async fn post(&self, output: Output) -> Result<Output, Error>;
}

Custom Transform Node

The CustomTransform provides a flexible implementation:

pub struct CustomTransform<Input, Output, Error, P, E, T> {
    prep_fn: P,
    exec_fn: E,
    post_fn: T,
    _phantom: PhantomData<(Input, Output, Error)>,
}

Implementation Details

Transformation Phases

  1. Preparation Phase (prep)
  2. Input validation
  3. Data normalization

  4. Resource initialization

  5. Execution Phase (exec)

  6. Core transformation logic
  7. Error handling

  8. State management

  9. Post-Processing Phase (post)

  10. Output validation
  11. Resource cleanup
  12. Result formatting

Error Handling

  1. Custom Error Types
  2. Type-safe error handling
  3. Error context preservation

  4. Error recovery strategies

  5. Phase-Specific Errors

  6. Preparation errors
  7. Execution errors
  8. Post-processing errors

Resource Management

  1. Memory Usage
  2. Efficient transformations
  3. Resource cleanup

  4. Memory leak prevention

  5. Thread Safety

  6. Thread-safe execution
  7. Safe state updates
  8. Proper synchronization

Usage Patterns

Basic Usage

let node = CustomTransform::new(
    |input: Input| async { Ok(input) },
    |input: Input| async { transform(input) },
    |output: Output| async { Ok(output) },
);

With Validation

let node = CustomTransform::new(
    |input: Input| async {
        if !is_valid(&input) {
            return Err(TransformError::ValidationError("Invalid input".into()));
        }
        Ok(input)
    },
    |input: Input| async { transform(input) },
    |output: Output| async {
        validate_output(&output)?;
        Ok(output)
    },
);

With Resource Management

let node = CustomTransform::new(
    |input: Input| async {
        initialize_resources()?;
        Ok(input)
    },
    |input: Input| async { transform(input) },
    |output: Output| async {
        cleanup_resources()?;
        Ok(output)
    },
);

Testing

The implementation includes comprehensive tests:

  1. Unit Tests
  2. Phase execution
  3. Error handling

  4. Resource management

  5. Integration Tests

  6. Complex transformations
  7. Error scenarios
  8. Performance tests

Performance Considerations

  1. Transformation Efficiency
  2. Minimal allocations
  3. Efficient algorithms

  4. Resource optimization

  5. Memory Usage

  6. Optimized data structures
  7. Proper cleanup
  8. Minimal copying

Future Improvements

  1. Enhanced Features
  2. More transformation utilities
  3. Additional validation patterns

  4. Extended error handling

  5. Performance Optimizations

  6. Improved algorithms
  7. Better resource usage
  8. Enhanced concurrency