module-registry 0.1.0

# Plugin Development - Module Registry

## Overview

This document provides comprehensive guidance for developing plugins using the Module Registry.

## Plugin Architecture

### Plugin System Design

The Module Registry plugin system is designed to be:
- **Extensible**: Easy to add new plugin types
- **Type-Safe**: Compile-time type checking
- **Performant**: Optimized for high performance
- **Secure**: Built-in security measures
- **Maintainable**: Clean separation of concerns

### Plugin Components

1. **Plugin Interface**: Defines the contract for plugins
2. **Plugin Implementation**: Concrete implementation of the interface
3. **Plugin Registry**: Manages plugin registration and discovery
4. **Plugin Loader**: Handles plugin loading and instantiation
5. **Plugin Manager**: Manages plugin lifecycle and communication

## Plugin Interface

### Basic Plugin Interface

```rust
use module_registry::{Plugin, PluginError, PluginType};

pub trait Plugin: Send + Sync {
    /// Get the plugin name
    fn name(&self) -> &str;
    
    /// Get the plugin version
    fn version(&self) -> &str;
    
    /// Get the plugin type
    fn plugin_type(&self) -> PluginType;
    
    /// Get the plugin capabilities
    fn capabilities(&self) -> &[String];
    
    /// Initialize the plugin
    fn initialize(&mut self) -> Result<(), PluginError>;
    
    /// Cleanup the plugin
    fn cleanup(&mut self) -> Result<(), PluginError>;
    
    /// Process data
    fn process(&self, data: &[u8]) -> Result<Vec<u8>, PluginError>;
}
```

### Advanced Plugin Interface

```rust
use module_registry::{Plugin, PluginError, PluginType, PluginContext};

pub trait AdvancedPlugin: Plugin {
    /// Get the plugin context
    fn context(&self) -> &PluginContext;
    
    /// Set the plugin context
    fn set_context(&mut self, context: PluginContext);
    
    /// Get the plugin configuration
    fn configuration(&self) -> &PluginConfiguration;
    
    /// Set the plugin configuration
    fn set_configuration(&mut self, config: PluginConfiguration);
    
    /// Get the plugin state
    fn state(&self) -> &PluginState;
    
    /// Set the plugin state
    fn set_state(&mut self, state: PluginState);
    
    /// Get the plugin metrics
    fn metrics(&self) -> &PluginMetrics;
    
    /// Update the plugin metrics
    fn update_metrics(&mut self, metrics: PluginMetrics);
}
```

## Plugin Implementation

### Basic Plugin Implementation

```rust
use module_registry::{Plugin, PluginError, PluginType};

pub struct DataProcessorPlugin {
    name: String,
    version: String,
    capabilities: Vec<String>,
}

impl DataProcessorPlugin {
    pub fn new(name: &str, version: &str) -> Self {
        Self {
            name: name.to_string(),
            version: version.to_string(),
            capabilities: vec!["processing".to_string()],
        }
    }
}

impl Plugin for DataProcessorPlugin {
    fn name(&self) -> &str {
        &self.name
    }
    
    fn version(&self) -> &str {
        &self.version
    }
    
    fn plugin_type(&self) -> PluginType {
        PluginType::DataProcessor
    }
    
    fn capabilities(&self) -> &[String] {
        &self.capabilities
    }
    
    fn initialize(&mut self) -> Result<(), PluginError> {
        // Initialize the plugin
        println!("Initializing plugin: {}", self.name);
        Ok(())
    }
    
    fn cleanup(&mut self) -> Result<(), PluginError> {
        // Cleanup the plugin
        println!("Cleaning up plugin: {}", self.name);
        Ok(())
    }
    
    fn process(&self, data: &[u8]) -> Result<Vec<u8>, PluginError> {
        // Process the data
        let result = self.process_data(data)?;
        Ok(result)
    }
}

impl DataProcessorPlugin {
    fn process_data(&self, data: &[u8]) -> Result<Vec<u8>, PluginError> {
        // Implement data processing logic
        Ok(data.to_vec())
    }
}
```

### Advanced Plugin Implementation

```rust
use module_registry::{AdvancedPlugin, PluginError, PluginType, PluginContext, PluginConfiguration, PluginState, PluginMetrics};

pub struct AdvancedDataProcessorPlugin {
    name: String,
    version: String,
    capabilities: Vec<String>,
    context: PluginContext,
    configuration: PluginConfiguration,
    state: PluginState,
    metrics: PluginMetrics,
}

impl AdvancedDataProcessorPlugin {
    pub fn new(name: &str, version: &str) -> Self {
        Self {
            name: name.to_string(),
            version: version.to_string(),
            capabilities: vec!["processing".to_string(), "analysis".to_string()],
            context: PluginContext::new(),
            configuration: PluginConfiguration::new(),
            state: PluginState::new(),
            metrics: PluginMetrics::new(),
        }
    }
}

impl Plugin for AdvancedDataProcessorPlugin {
    fn name(&self) -> &str {
        &self.name
    }
    
    fn version(&self) -> &str {
        &self.version
    }
    
    fn plugin_type(&self) -> PluginType {
        PluginType::DataProcessor
    }
    
    fn capabilities(&self) -> &[String] {
        &self.capabilities
    }
    
    fn initialize(&mut self) -> Result<(), PluginError> {
        // Initialize the plugin with context and configuration
        self.context.initialize()?;
        self.configuration.load()?;
        self.state.set_initialized(true);
        Ok(())
    }
    
    fn cleanup(&mut self) -> Result<(), PluginError> {
        // Cleanup the plugin
        self.state.set_initialized(false);
        self.context.cleanup()?;
        Ok(())
    }
    
    fn process(&self, data: &[u8]) -> Result<Vec<u8>, PluginError> {
        // Process the data with advanced features
        let result = self.process_data_advanced(data)?;
        Ok(result)
    }
}

impl AdvancedPlugin for AdvancedDataProcessorPlugin {
    fn context(&self) -> &PluginContext {
        &self.context
    }
    
    fn set_context(&mut self, context: PluginContext) {
        self.context = context;
    }
    
    fn configuration(&self) -> &PluginConfiguration {
        &self.configuration
    }
    
    fn set_configuration(&mut self, config: PluginConfiguration) {
        self.configuration = config;
    }
    
    fn state(&self) -> &PluginState {
        &self.state
    }
    
    fn set_state(&mut self, state: PluginState) {
        self.state = state;
    }
    
    fn metrics(&self) -> &PluginMetrics {
        &self.metrics
    }
    
    fn update_metrics(&mut self, metrics: PluginMetrics) {
        self.metrics = metrics;
    }
}

impl AdvancedDataProcessorPlugin {
    fn process_data_advanced(&self, data: &[u8]) -> Result<Vec<u8>, PluginError> {
        // Implement advanced data processing logic
        let result = self.context.process(data)?;
        Ok(result)
    }
}
```

## Plugin Registration

### Basic Plugin Registration

```rust
use module_registry::{ModuleRegistry, PluginConfig, PluginType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register a basic plugin
    let plugin_config = PluginConfig::new()
        .with_name("data-processor-plugin")
        .with_version("1.0.0")
        .with_type(PluginType::DataProcessor)
        .add_capability("processing");
    
    registry.register_plugin(plugin_config)?;
    
    println!("Plugin registered successfully");
    
    Ok(())
}
```

### Advanced Plugin Registration

```rust
use module_registry::{ModuleRegistry, AdvancedPluginConfig, PluginType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register an advanced plugin
    let plugin_config = AdvancedPluginConfig::new()
        .with_name("advanced-data-processor-plugin")
        .with_version("1.0.0")
        .with_type(PluginType::DataProcessor)
        .add_capability("processing")
        .add_capability("analysis")
        .add_dependency("base-plugin")
        .with_metadata("author", "John Doe")
        .with_metadata("license", "MIT")
        .with_metadata("description", "Advanced data processor plugin");
    
    registry.register_advanced_plugin(plugin_config)?;
    
    println!("Advanced plugin registered successfully");
    
    Ok(())
}
```

### Plugin Factory Registration

```rust
use module_registry::{ModuleRegistry, PluginFactoryConfig, PluginType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register a plugin factory
    let factory_config = PluginFactoryConfig::new()
        .with_name("data-processor-factory")
        .with_type(PluginType::DataProcessor)
        .with_factory_method("create_processor")
        .with_factory_interface("DataProcessorFactory");
    
    registry.register_plugin_factory(factory_config)?;
    
    println!("Plugin factory registered successfully");
    
    Ok(())
}
```

## Plugin Discovery

### Basic Plugin Discovery

```rust
use module_registry::{ModuleRegistry, PluginDiscoveryQuery, PluginType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register plugins
    let plugins = vec![
        ("data-processor-plugin", PluginType::DataProcessor),
        ("data-analyzer-plugin", PluginType::Analyzer),
        ("data-storage-plugin", PluginType::Storage),
    ];
    
    for (name, plugin_type) in plugins {
        let config = PluginConfig::new()
            .with_name(name)
            .with_version("1.0.0")
            .with_type(plugin_type);
        
        registry.register_plugin(config)?;
    }
    
    // Discover plugins by type
    let query = PluginDiscoveryQuery::new()
        .with_type_filter(PluginType::DataProcessor);
    
    let found_plugins = registry.discover_plugins(query)?;
    println!("Found {} data processor plugins", found_plugins.len());
    
    Ok(())
}
```

### Capability-Based Plugin Discovery

```rust
use module_registry::{ModuleRegistry, PluginCapabilityQuery, PluginType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register plugins with capabilities
    let plugins = vec![
        ("encryption-plugin", vec!["encryption", "decryption"]),
        ("compression-plugin", vec!["compression", "decompression"]),
        ("monitoring-plugin", vec!["monitoring", "logging"]),
    ];
    
    for (name, capabilities) in plugins {
        let config = PluginConfig::new()
            .with_name(name)
            .with_version("1.0.0")
            .with_type(PluginType::Security);
        
        for capability in capabilities {
            config.add_capability(capability);
        }
        
        registry.register_plugin(config)?;
    }
    
    // Discover plugins by capabilities
    let query = PluginCapabilityQuery::new()
        .with_required_capabilities(vec!["encryption"])
        .with_optional_capabilities(vec!["monitoring"]);
    
    let found_plugins = registry.discover_plugins_by_capabilities(query)?;
    println!("Found {} plugins with encryption capability", found_plugins.len());
    
    Ok(())
}
```

### Semantic Plugin Discovery

```rust
use module_registry::{ModuleRegistry, PluginSemanticQuery, PluginType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register plugins with metadata
    let plugins = vec![
        ("high-performance-processor", "High-performance data processor"),
        ("low-latency-processor", "Low-latency data processor"),
        ("batch-processor", "Batch data processor"),
    ];
    
    for (name, description) in plugins {
        let config = PluginConfig::new()
            .with_name(name)
            .with_version("1.0.0")
            .with_type(PluginType::DataProcessor)
            .with_metadata("description", description);
        
        registry.register_plugin(config)?;
    }
    
    // Discover plugins semantically
    let query = PluginSemanticQuery::new()
        .with_intent("data processing")
        .with_context("high performance")
        .with_requirements(vec!["performance", "scalability"]);
    
    let found_plugins = registry.discover_plugins_semantically(query)?;
    println!("Found {} high-performance plugins", found_plugins.len());
    
    Ok(())
}
```

## Plugin Instantiation

### Basic Plugin Instantiation

```rust
use module_registry::{ModuleRegistry, PluginInstantiationConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register a plugin
    let plugin_config = PluginConfig::new()
        .with_name("data-processor-plugin")
        .with_version("1.0.0")
        .with_type(PluginType::DataProcessor);
    
    registry.register_plugin(plugin_config)?;
    
    // Create a plugin instance
    let instance = registry.create_plugin("data-processor-plugin")?;
    
    // Use the plugin
    let data = b"input data";
    let result = instance.process(data)?;
    
    println!("Processed data: {:?}", result);
    
    Ok(())
}
```

### Advanced Plugin Instantiation

```rust
use module_registry::{ModuleRegistry, AdvancedPluginInstantiationConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register a plugin
    let plugin_config = PluginConfig::new()
        .with_name("data-processor-plugin")
        .with_version("1.0.0")
        .with_type(PluginType::DataProcessor);
    
    registry.register_plugin(plugin_config)?;
    
    // Create a plugin instance with advanced configuration
    let config = AdvancedPluginInstantiationConfig::new()
        .with_initialization(true)
        .with_validation(true)
        .with_monitoring(true)
        .with_context(PluginContext::new())
        .with_configuration(PluginConfiguration::new());
    
    let instance = registry.create_advanced_plugin("data-processor-plugin", config)?;
    
    // Use the plugin
    let data = b"input data";
    let result = instance.process(data)?;
    
    println!("Processed data: {:?}", result);
    
    Ok(())
}
```

### Plugin Factory Instantiation

```rust
use module_registry::{ModuleRegistry, PluginFactoryConfig, PluginType};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Register a plugin factory
    let factory_config = PluginFactoryConfig::new()
        .with_name("data-processor-factory")
        .with_type(PluginType::DataProcessor)
        .with_factory_method("create_processor");
    
    registry.register_plugin_factory(factory_config)?;
    
    // Create a plugin instance using factory
    let instance = registry.create_plugin_from_factory("data-processor-factory", "high-performance")?;
    
    // Use the plugin
    let data = b"input data";
    let result = instance.process(data)?;
    
    println!("Processed data: {:?}", result);
    
    Ok(())
}
```

## Plugin Configuration

### Basic Plugin Configuration

```rust
use module_registry::{ModuleRegistry, PluginConfiguration};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure plugin system
    let config = PluginConfiguration::new()
        .with_plugin_loading(true)
        .with_plugin_validation(true)
        .with_plugin_monitoring(true);
    
    registry.configure_plugin_system(config)?;
    
    println!("Plugin system configured");
    
    Ok(())
}
```

### Advanced Plugin Configuration

```rust
use module_registry::{ModuleRegistry, AdvancedPluginConfiguration};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure plugin system with advanced settings
    let config = AdvancedPluginConfiguration::new()
        .with_plugin_loading(true)
        .with_plugin_validation(true)
        .with_plugin_monitoring(true)
        .with_plugin_security(true)
        .with_plugin_performance(true)
        .with_plugin_caching(true);
    
    registry.configure_advanced_plugin_system(config)?;
    
    println!("Advanced plugin system configured");
    
    Ok(())
}
```

### Environment-Specific Plugin Configuration

```rust
use module_registry::{ModuleRegistry, EnvironmentPluginConfiguration};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure for development environment
    let dev_config = EnvironmentPluginConfiguration::new()
        .with_environment("development")
        .with_debug_mode(true)
        .with_verbose_logging(true)
        .with_mock_plugins(true);
    
    // Configure for production environment
    let prod_config = EnvironmentPluginConfiguration::new()
        .with_environment("production")
        .with_debug_mode(false)
        .with_verbose_logging(false)
        .with_real_plugins(true);
    
    registry.configure_environment_plugin_system("development", dev_config)?;
    registry.configure_environment_plugin_system("production", prod_config)?;
    
    println!("Plugin system configured for multiple environments");
    
    Ok(())
}
```

## Plugin Security

### Basic Plugin Security

```rust
use module_registry::{ModuleRegistry, PluginSecurityConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure plugin security
    let security_config = PluginSecurityConfig::new()
        .with_secure_plugin_loading(true)
        .with_plugin_validation(true)
        .with_plugin_sandboxing(true)
        .with_plugin_permissions(true);
    
    registry.configure_plugin_security(security_config)?;
    
    println!("Plugin security configured");
    
    Ok(())
}
```

### Advanced Plugin Security

```rust
use module_registry::{ModuleRegistry, AdvancedPluginSecurityConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure advanced plugin security
    let security_config = AdvancedPluginSecurityConfig::new()
        .with_secure_plugin_loading(true)
        .with_plugin_validation(true)
        .with_plugin_sandboxing(true)
        .with_plugin_permissions(true)
        .with_plugin_encryption(true)
        .with_plugin_authentication(true)
        .with_plugin_authorization(true);
    
    registry.configure_advanced_plugin_security(security_config)?;
    
    println!("Advanced plugin security configured");
    
    Ok(())
}
```

### Plugin Access Control

```rust
use module_registry::{ModuleRegistry, PluginAccessControlConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure plugin access control
    let access_config = PluginAccessControlConfig::new()
        .with_role_based_access(true)
        .with_permission_validation(true)
        .with_access_logging(true)
        .with_access_monitoring(true);
    
    registry.configure_plugin_access_control(access_config)?;
    
    println!("Plugin access control configured");
    
    Ok(())
}
```

## Plugin Monitoring

### Basic Plugin Monitoring

```rust
use module_registry::{ModuleRegistry, PluginMonitoringConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure plugin monitoring
    let monitoring_config = PluginMonitoringConfig::new()
        .with_plugin_metrics(true)
        .with_plugin_logging(true)
        .with_plugin_alerting(true);
    
    registry.configure_plugin_monitoring(monitoring_config)?;
    
    println!("Plugin monitoring configured");
    
    Ok(())
}
```

### Advanced Plugin Monitoring

```rust
use module_registry::{ModuleRegistry, AdvancedPluginMonitoringConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure advanced plugin monitoring
    let monitoring_config = AdvancedPluginMonitoringConfig::new()
        .with_plugin_metrics(true)
        .with_performance_metrics(true)
        .with_security_metrics(true)
        .with_health_metrics(true)
        .with_plugin_logging(true)
        .with_structured_logging(true)
        .with_plugin_alerting(true)
        .with_real_time_alerting(true);
    
    registry.configure_advanced_plugin_monitoring(monitoring_config)?;
    
    println!("Advanced plugin monitoring configured");
    
    Ok(())
}
```

### Plugin Health Monitoring

```rust
use module_registry::{ModuleRegistry, PluginHealthMonitoringConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let registry = ModuleRegistry::new();
    
    // Configure plugin health monitoring
    let health_config = PluginHealthMonitoringConfig::new()
        .with_plugin_health_checks(true)
        .with_plugin_health_metrics(true)
        .with_plugin_health_alerts(true)
        .with_plugin_health_dashboard(true);
    
    registry.configure_plugin_health_monitoring(health_config)?;
    
    println!("Plugin health monitoring configured");
    
    Ok(())
}
```

## Conclusion

This comprehensive guide provides everything you need to develop plugins using the Module Registry. By following these guidelines, you can create sophisticated, secure, and performant plugins that integrate seamlessly with the Module Registry system.

Key plugin development areas:

1. **Plugin Architecture**: Understanding the plugin system design
2. **Plugin Interface**: Implementing plugin interfaces and contracts
3. **Plugin Implementation**: Creating concrete plugin implementations
4. **Plugin Registration**: Registering plugins with the registry
5. **Plugin Discovery**: Finding and discovering plugins
6. **Plugin Instantiation**: Creating and using plugin instances
7. **Plugin Configuration**: Configuring plugin systems
8. **Plugin Security**: Implementing security measures
9. **Plugin Monitoring**: Setting up monitoring and observability