sklears_compose/modular_framework/

mod.rs

//! Modular Framework for Component Composition
//!
//! This module provides a comprehensive framework for building modular, composable systems
//! with support for component lifecycle management, dependency resolution, event-driven
//! communication, pipeline execution, and advanced composition patterns.
//!
//! The framework is organized into several key modules:
//!
//! ## Core Components
//!
//! ### Component Framework
//! - [`component_framework`] - Core component abstractions, factory patterns, and registry
//! - [`registry_system`] - Component registration, discovery, and lifecycle management
//! - [`lifecycle_management`] - Component lifecycle states and dependency-aware initialization
//!
//! ### Communication and Events
//! - [`event_system`] - Event-driven communication with publish-subscribe patterns
//! - [`dependency_management`] - Dependency resolution, compatibility checking, and injection
//!
//! ### Execution and Orchestration
//! - [`pipeline_system`] - Modular pipeline configuration and execution strategies
//! - [`execution_engine`] - Composition execution engine with resource management
//!
//! ### Advanced Composition
//! - [`advanced_composition`] - Type-safe, functional, and algebraic composition patterns
//!
//! ## Quick Start
//!
//! ```rust
//! use sklears_compose::modular_framework::{ComponentConfig, ComponentFramework, PipelineBuilder};
//!
//! let _framework = ComponentFramework::new();
//! let pipeline = PipelineBuilder::new()
//!     .add_stage("preprocessor", ComponentConfig::new("pre", "standard_scaler"))
//!     .add_stage("trainer", ComponentConfig::new("train", "random_forest"))
//!     .build()
//!     .unwrap();
//! assert_eq!(pipeline.stages.len(), 2);
//! ```
//!
//! ## Architecture Overview
//!
//! The modular framework follows a layered architecture:
//!
//! ```text
//! ┌─────────────────────────────────────────────────────────────┐
//! │                Advanced Composition                         │
//! │  Type-Safe • Functional • Algebraic • Higher-Order         │
//! ├─────────────────────────────────────────────────────────────┤
//! │                  Execution Engine                          │
//! │   Resource Management • Scheduling • Orchestration         │
//! ├─────────────────────────────────────────────────────────────┤
//! │                  Pipeline System                           │
//! │   Sequential • Parallel • Conditional • Error Handling     │
//! ├─────────────────────────────────────────────────────────────┤
//! │              Communication Layer                           │
//! │   Event System • Dependency Management • Injection         │
//! ├─────────────────────────────────────────────────────────────┤
//! │                Component Framework                         │
//! │   Registry • Lifecycle • Factory • Configuration           │
//! └─────────────────────────────────────────────────────────────┘
//! ```
//!
//! ## Key Features
//!
//! - **Type Safety**: Compile-time guarantees for component composition
//! - **Lifecycle Management**: Dependency-aware component initialization and shutdown
//! - **Event-Driven**: Decoupled communication through publish-subscribe patterns
//! - **Pipeline Execution**: Flexible execution strategies with error handling
//! - **Resource Management**: Intelligent allocation and monitoring of system resources
//! - **Dependency Resolution**: Automatic dependency resolution with circular detection
//! - **Functional Composition**: Higher-order abstractions and category theory patterns
//! - **Performance Monitoring**: Comprehensive metrics and execution statistics

pub mod advanced_composition;
pub mod component_framework;
pub mod dependency_management;
pub mod event_system;
pub mod execution_engine;
pub mod lifecycle_management;
pub mod pipeline_system;
pub mod registry_system;

// Re-export core types and traits for convenience
pub use component_framework::{
    CapabilityMismatch, CapabilityMismatchSeverity, CompatibilityReport, ComponentCapability,
    ComponentConfig, ComponentDependency, ComponentEvent as FrameworkComponentEvent,
    ComponentFactory, ComponentInfo, ComponentMetadata, ComponentMetrics, ComponentNode,
    ComponentRegistry, ComponentState, ComponentStatus, ConfigValue, EnvironmentSettings,
    ExecutionCondition, ExecutionConditionType, ExecutionMetadata, ExecutionStatus, HealthStatus,
    LogLevel, MetricValue, MissingDependency, PluggableComponent, ResourceConstraints,
    ResourceLimits, ResourceUsage, SecuritySettings, VersionConflict,
};

pub use registry_system::{
    ComponentQuery, ComponentRegistrationMetadata, ComponentTypeInfo, ComponentVersionInfo,
    GlobalComponentRegistry, PluginLoadResult, RegistryConfiguration, RegistryError, RegistryHooks,
    RegistryStatistics,
};

pub use lifecycle_management::{
    ComponentLifecycleState, InitializationResult, LifecycleConfig, LifecycleEvent,
    LifecycleManager, LifecycleMetrics, ShutdownResult,
};

pub use event_system::{
    ComponentEvent, EventBus, EventCategory, EventHandler, EventMetadata, EventPriority,
    EventProcessingResult, EventRoutingConfig, EventStatistics, RoutingRule, RoutingStrategy,
};

pub use dependency_management::{
    CircularDependency, CompatibilityIssue, CompatibilityIssueType, CompatibilityResult,
    ConflictType, DependencyConflict, DependencyError, DependencyGraph,
    DependencyInjectionRegistry, DependencyNode, DependencyProvider, DependencyResolutionConfig,
    DependencyResolver, DependencyState, DependencyStatistics, ResolutionResult, VersionConstraint,
    VersionConstraintSolver,
};

pub use pipeline_system::{
    BackoffStrategy, ConditionalExecution, ErrorHandlingStrategy, ExecutionContext,
    ExecutionStrategy, ExecutionTrace, ModularPipeline, ModularPipelineBuilder, ParallelBranch,
    Pipeline, PipelineBuilder, PipelineConfig, PipelineConfiguration, PipelineData, PipelineError,
    PipelineMetadata, PipelineMetrics, PipelineResult, PipelineStage, PipelineState, PipelineStep,
    RetryConfig, RetryConfiguration, RetryPolicy, StageMetrics, StageResult, StageType,
    TimeoutAction, TimeoutConfig,
};

pub use execution_engine::{
    ComponentExecutionResult, CompositionContext, CompositionExecutionEngine, CompositionGraph,
    CompositionNode, CompositionResult, ConcurrentExecution, ContextState, ExecutionEngineConfig,
    ExecutionEngineError, ExecutionPlan, ExecutionPriority, ExecutionResult, ExecutionScheduler,
    ExecutionStatistics, ResourceAllocation, ResourceAllocationStrategy, ResourceManager,
};

pub use advanced_composition::{
    AdvancedCompositionError, AlgebraicComposer, AlgebraicComposition, AlgebraicOperation,
    Applicative, ApplicativeFunctor, CategoryMorphism, Composition, CompositionCombinator,
    CompositionFunction, CompositionMetadata, CompositionType, ConstraintType, FunctionalComposer,
    FunctionalComposition, Functor, HigherOrderComposer, HigherOrderComposition,
    HigherOrderTransform, MetaComposition, Monad, MonadTransformer,
    ParallelBranch as TypedParallelBranch, PatternMatcher, ProductTypeComposition,
    RecursiveCompositionPattern, SumTypeComposition, TypeConstraint, TypeConstraints,
    TypePredicate, TypeSafeComposer, TypedComposition, TypedTransformer,
};

use sklears_core::error::Result as SklResult;
use std::sync::Arc;

/// High-level facade for the modular framework
///
/// Provides a simplified interface for creating and managing modular systems
/// with sensible defaults and common usage patterns.
#[derive(Debug)]
pub struct ComponentFramework {
    /// Component registry
    registry: Arc<GlobalComponentRegistry>,
    /// Dependency resolver
    dependency_resolver: Arc<DependencyResolver>,
    /// Lifecycle manager
    lifecycle_manager: Arc<LifecycleManager>,
    /// Execution engine
    execution_engine: Arc<CompositionExecutionEngine>,
    /// Event bus
    event_bus: Arc<std::sync::RwLock<EventBus>>,
}

impl ComponentFramework {
    /// Create a new component framework instance
    #[must_use]
    pub fn new() -> Self {
        let registry = Arc::new(GlobalComponentRegistry::new());
        let dependency_resolver = Arc::new(DependencyResolver::new());
        let lifecycle_manager = Arc::new(LifecycleManager::new());
        let execution_engine = Arc::new(CompositionExecutionEngine::new(
            registry.clone(),
            dependency_resolver.clone(),
            lifecycle_manager.clone(),
        ));
        let event_bus = Arc::new(std::sync::RwLock::new(EventBus::new()));

        Self {
            registry,
            dependency_resolver,
            lifecycle_manager,
            execution_engine,
            event_bus,
        }
    }

    /// Register a component factory
    pub fn register_component_factory(
        &self,
        component_type: &str,
        factory: Arc<dyn ComponentFactory>,
    ) -> SklResult<()> {
        self.registry.register_factory(component_type, factory)
    }

    /// Create a pipeline builder
    #[must_use]
    pub fn pipeline_builder(&self) -> PipelineBuilder {
        PipelineBuilder::new()
    }

    /// Execute a pipeline within the framework
    pub async fn execute_pipeline(
        &self,
        pipeline: Pipeline,
        input_data: PipelineData,
    ) -> SklResult<execution_engine::ExecutionResult> {
        let context_id = "default_context";
        self.execution_engine
            .execute_pipeline(context_id, pipeline, input_data)
            .await
    }

    /// Create a type-safe composer
    #[must_use]
    pub fn type_safe_composer<I, O>(&self) -> TypeSafeComposer<I, O>
    where
        I: CompositionType + Send + Sync + 'static,
        O: CompositionType + Send + Sync + 'static,
    {
        TypeSafeComposer::new()
    }

    /// Create a functional composer
    #[must_use]
    pub fn functional_composer(&self) -> FunctionalComposer {
        FunctionalComposer::new()
    }

    /// Create an algebraic composer
    #[must_use]
    pub fn algebraic_composer(&self) -> AlgebraicComposer {
        AlgebraicComposer::new()
    }

    /// Create a higher-order composer
    #[must_use]
    pub fn higher_order_composer(&self) -> HigherOrderComposer {
        HigherOrderComposer::new()
    }

    /// Get framework statistics
    #[must_use]
    pub fn get_statistics(&self) -> FrameworkStatistics {
        FrameworkStatistics {
            registry_stats: self.registry.get_statistics(),
            dependency_stats: self.dependency_resolver.get_statistics(),
            lifecycle_stats: self.lifecycle_manager.get_metrics().clone(),
            execution_stats: self.execution_engine.get_statistics(),
        }
    }

    /// Get the component registry
    #[must_use]
    pub fn registry(&self) -> &Arc<GlobalComponentRegistry> {
        &self.registry
    }

    /// Get the dependency resolver
    #[must_use]
    pub fn dependency_resolver(&self) -> &Arc<DependencyResolver> {
        &self.dependency_resolver
    }

    /// Get the lifecycle manager
    #[must_use]
    pub fn lifecycle_manager(&self) -> &Arc<LifecycleManager> {
        &self.lifecycle_manager
    }

    /// Get the execution engine
    #[must_use]
    pub fn execution_engine(&self) -> &Arc<CompositionExecutionEngine> {
        &self.execution_engine
    }

    /// Get the event bus
    #[must_use]
    pub fn event_bus(&self) -> &Arc<std::sync::RwLock<EventBus>> {
        &self.event_bus
    }

    /// Shutdown the framework gracefully
    pub async fn shutdown(&self) -> SklResult<()> {
        // Shutdown execution engine
        self.execution_engine.shutdown().await?;

        // Shutdown lifecycle manager
        if let Ok(mut manager) = Arc::try_unwrap(self.lifecycle_manager.clone()) {
            manager.shutdown_all_components()?;
        }

        Ok(())
    }
}

/// Comprehensive framework statistics
#[derive(Debug, Clone)]
pub struct FrameworkStatistics {
    /// Registry statistics
    pub registry_stats: RegistryStatistics,
    /// Dependency resolution statistics
    pub dependency_stats: DependencyStatistics,
    /// Lifecycle management statistics
    pub lifecycle_stats: LifecycleMetrics,
    /// Execution engine statistics
    pub execution_stats: ExecutionStatistics,
}

impl FrameworkStatistics {
    /// Get overall framework health score
    #[must_use]
    pub fn health_score(&self) -> f64 {
        let registry_health = if self.registry_stats.total_registered_factories > 0 {
            1.0
        } else {
            0.0
        };
        let dependency_health = self.dependency_stats.resolution_success_rate();
        let execution_health = self.execution_stats.success_rate();

        (registry_health + dependency_health + execution_health) / 3.0
    }

    /// Get total components managed
    #[must_use]
    pub fn total_components(&self) -> u64 {
        self.registry_stats.total_registered_factories
            + self.dependency_stats.total_components
            + self.lifecycle_stats.total_components as u64
    }

    /// Get total executions
    #[must_use]
    pub fn total_executions(&self) -> u64 {
        self.execution_stats.total_executions
    }
}

/// Builder for creating modular frameworks with custom configuration
#[derive(Debug)]
pub struct ComponentFrameworkBuilder {
    /// Registry configuration
    registry_config: Option<RegistryConfiguration>,
    /// Dependency resolution configuration
    dependency_config: Option<DependencyResolutionConfig>,
    /// Lifecycle configuration
    lifecycle_config: Option<LifecycleConfig>,
    /// Execution engine configuration
    execution_config: Option<ExecutionEngineConfig>,
}

impl ComponentFrameworkBuilder {
    /// Create a new framework builder
    #[must_use]
    pub fn new() -> Self {
        Self {
            registry_config: None,
            dependency_config: None,
            lifecycle_config: None,
            execution_config: None,
        }
    }

    /// Configure the component registry
    #[must_use]
    pub fn with_registry_config(mut self, config: RegistryConfiguration) -> Self {
        self.registry_config = Some(config);
        self
    }

    /// Configure dependency resolution
    #[must_use]
    pub fn with_dependency_config(mut self, config: DependencyResolutionConfig) -> Self {
        self.dependency_config = Some(config);
        self
    }

    /// Configure lifecycle management
    #[must_use]
    pub fn with_lifecycle_config(mut self, config: LifecycleConfig) -> Self {
        self.lifecycle_config = Some(config);
        self
    }

    /// Configure execution engine
    #[must_use]
    pub fn with_execution_config(mut self, config: ExecutionEngineConfig) -> Self {
        self.execution_config = Some(config);
        self
    }

    /// Build the configured framework
    #[must_use]
    pub fn build(self) -> ComponentFramework {
        // For now, return default framework
        // In a real implementation, this would apply the configurations
        ComponentFramework::new()
    }
}

/// Convenience functions for common framework operations
impl ComponentFramework {
    /// Create a simple sequential pipeline
    pub fn create_sequential_pipeline(
        &self,
        stages: Vec<(&str, ComponentConfig)>,
    ) -> SklResult<Pipeline> {
        let mut builder = self.pipeline_builder();

        for (component_type, config) in stages {
            builder = builder.add_stage(component_type, config);
        }

        builder.build()
    }

    /// Create a parallel pipeline with branches
    pub fn create_parallel_pipeline(&self, branches: Vec<ParallelBranch>) -> SklResult<Pipeline> {
        self.pipeline_builder().add_parallel_stage(branches).build()
    }

    /// Register multiple component factories at once
    pub fn register_factories(
        &self,
        factories: Vec<(&str, Arc<dyn ComponentFactory>)>,
    ) -> SklResult<()> {
        for (component_type, factory) in factories {
            self.register_component_factory(component_type, factory)?;
        }
        Ok(())
    }

    /// Discover available component types
    #[must_use]
    pub fn discover_components(&self) -> Vec<ComponentTypeInfo> {
        self.registry.discover_component_types()
    }

    /// Query components by capability
    #[must_use]
    pub fn query_by_capability(&self, capability: &str) -> Vec<ComponentQuery> {
        self.registry.query_components_by_capability(capability)
    }
}

impl Default for ComponentFramework {
    fn default() -> Self {
        Self::new()
    }
}

impl Default for ComponentFrameworkBuilder {
    fn default() -> Self {
        Self::new()
    }
}

#[allow(non_snake_case)]
#[cfg(test)]
mod tests {
    use super::*;
    use std::collections::HashMap;

    #[test]
    fn test_framework_creation() {
        let framework = ComponentFramework::new();
        let stats = framework.get_statistics();

        assert_eq!(stats.registry_stats.total_registered_factories, 0);
        assert_eq!(stats.execution_stats.total_executions, 0);
    }

    #[test]
    fn test_framework_builder() {
        let builder = ComponentFrameworkBuilder::new()
            .with_registry_config(RegistryConfiguration::default())
            .with_dependency_config(DependencyResolutionConfig::default());

        let framework = builder.build();
        assert!(
            framework
                .registry()
                .get_statistics()
                .startup_time
                .elapsed()
                .as_secs()
                < 1
        );
    }

    #[test]
    fn test_pipeline_builder() {
        let framework = ComponentFramework::new();
        let builder = framework.pipeline_builder();

        // Test that builder is created successfully
        assert!(builder.is_empty());
    }

    #[test]
    fn test_framework_statistics() {
        let framework = ComponentFramework::new();
        let stats = framework.get_statistics();

        assert_eq!(stats.total_components(), 0);
        assert_eq!(stats.total_executions(), 0);
        assert!(stats.health_score() >= 0.0 && stats.health_score() <= 1.0);
    }

    #[test]
    fn test_composers() {
        let framework = ComponentFramework::new();

        // Test that composers can be created
        let _functional = framework.functional_composer();
        let _algebraic = framework.algebraic_composer();
        let _higher_order = framework.higher_order_composer();
    }

    #[test]
    fn test_component_discovery() {
        let framework = ComponentFramework::new();
        let components = framework.discover_components();

        // Should start with no components
        assert_eq!(components.len(), 0);
    }
}

/// Module-level documentation tests
///
/// These tests demonstrate typical usage patterns for the modular framework.
///
/// ```rust,ignore
/// use sklears_compose::modular_framework::{ComponentFramework, PipelineBuilder};
///
/// // Create framework instance
/// let framework = ComponentFramework::new();
///
/// // Register component factories
/// framework.register_component_factory("preprocessor", factory1)?;
/// framework.register_component_factory("transformer", factory2)?;
///
/// // Build and execute pipeline
/// let pipeline = framework.pipeline_builder()
///     .add_stage("preprocessor", config1)
///     .add_stage("transformer", config2)
///     .build()?;
///
/// let result = framework.execute_pipeline(pipeline, input_data).await?;
/// ```
pub fn _module_docs() {}