# API Design Documentation

This document contains comprehensive API design documentation for all core modules in vLLM-omni. These templates provide a standardized structure for designing and implementing the core, engine, executor, and worker modules.

## 📋 Module API

### Core Module API
**Core module** provides fundamental scheduling, caching, and resource management functionality.

**Key Components:**
- Request scheduling and prioritization
- DiT cache management for diffusion models
- Resource allocation and coordination
- Inter-module communication

### Engine Module API
**Engine module** handles model loading, inference execution, and output processing.

**Key Components:**
- Model loading and initialization
- Inference execution for AR and diffusion models
- Input preprocessing for various modalities
- Output postprocessing and formatting

### Executor Module API
**Executor module** coordinates and manages request execution across different engines and workers.

**Key Components:**
- Request routing and load balancing
- Execution pipeline coordination
- Worker management and task distribution
- Error handling and recovery

### Worker Module API
**Worker module** provides the actual execution environment for model inference.

**Key Components:**
- Model execution and inference
- GPU resource management
- Request batching and processing
- Performance optimization


## 🔧 Implementation Guidelines

### Code Standards
- Use type hints for all methods
- Include comprehensive docstrings
- Follow PEP 8 style guidelines
- Use async/await for I/O operations

### Error Handling
- Define specific exception types
- Provide meaningful error messages
- Include error recovery strategies
- Log errors appropriately

### Configuration
- Use dataclasses for configuration
- Provide sensible defaults
- Include validation methods
- Support environment variables

### Testing
- Write unit tests for all public methods
- Include integration tests
- Test error conditions
- Validate configuration options

## 🚀 Getting Started

### For Developers

1. **Choose a Module**
   - Pick the module you want to work on
   - Read the corresponding API documentation
   - Understand the responsibilities and interfaces

2. **Set Up Development Environment**
   ```bash
   # Clone the repository
   git clone https://github.com/vllm-project/vllm-omni.git
   cd vllm-omni

   # Install dependencies
   pip install -e ".[dev]"

   # Set up pre-commit hooks
   pre-commit install
   ```

3. **Start Implementation**
   - Create the module directory
   - Implement base classes first
   - Add concrete implementations
   - Write tests as you go

### For Contributors

1. **Review API Documentation**
   - Read through all module APIs
   - Understand the overall architecture
   - Identify areas for improvement

2. **Propose Changes**
   - Create issues for API changes
   - Discuss in pull requests
   - Update documentation accordingly

3. **Submit Contributions**
   - Follow the coding standards
   - Include tests for new features
   - Update documentation
   - Submit pull requests

## 🤝 Contributing

We welcome contributions to improve the API documentation and implementation. Please:

1. **Follow the Template Structure**
   - Use the [api template](https://github.com/vllm-project/vllm-omni/docs/contributing/design_documents/api_design_template.md) as a guide
   - Maintain consistency across modules
   - Include all required sections

2. **Provide Working Examples**
   - Test all code examples
   - Include both basic and advanced usage
   - Show integration patterns

3. **Keep Documentation Updated**
   - Update docs when APIs change
   - Version control documentation changes
   - Maintain backward compatibility notes

## 📝 Notes

- All API documentation should be kept up-to-date with implementation
- Code examples should be tested and working
- Configuration options should be validated
- Error handling should be comprehensive
- Performance considerations should be documented

For questions or suggestions about the API documentation, please open an issue or start a discussion in the repository.