oxirs-arq 0.2.4

//! Workload classification and resource management

use serde::{Deserialize, Serialize};
use std::collections::HashMap;

pub struct WorkloadClassifier {
    /// Workload categories
    categories: HashMap<String, WorkloadCategory>,
    /// Real-time classification
    current_workload: WorkloadCharacteristics,
    /// Workload transitions
    transition_matrix: TransitionMatrix,
    /// Adaptive thresholds
    adaptive_thresholds: AdaptiveThresholds,
}

/// Workload category definition
#[derive(Debug, Clone)]
pub struct WorkloadCategory {
    pub name: String,
    pub characteristics: WorkloadCharacteristics,
    pub optimization_strategy: OptimizationStrategy,
    pub resource_requirements: ResourceRequirements,
}

/// Workload characteristics
#[derive(Debug, Clone)]
pub struct WorkloadCharacteristics {
    pub query_rate: f64,
    pub avg_complexity: f64,
    pub read_write_ratio: f64,
    pub temporal_locality: f64,
    pub data_locality: f64,
    pub concurrency_level: usize,
    pub resource_intensity: ResourceIntensity,
}

/// Resource intensity profile
#[derive(Debug, Clone)]
pub struct ResourceIntensity {
    pub cpu_intensive: f64,
    pub memory_intensive: f64,
    pub io_intensive: f64,
    pub network_intensive: f64,
}

/// Optimization strategy per workload
#[derive(Debug, Clone)]
pub struct OptimizationStrategy {
    pub priority_optimizations: Vec<OptimizationType>,
    pub resource_allocation: ResourceAllocation,
    pub caching_strategy: CachingStrategy,
    pub parallelization_factor: f64,
}

/// Resource allocation strategy
#[derive(Debug, Clone)]
pub struct ResourceAllocation {
    pub memory_allocation: f64,
    pub cpu_allocation: f64,
    pub io_bandwidth: f64,
    pub connection_pool_size: usize,
}

/// Caching strategy
#[derive(Debug, Clone)]
pub struct CachingStrategy {
    pub cache_size: usize,
    pub eviction_policy: EvictionPolicy,
    pub prefetch_strategy: PrefetchStrategy,
    pub invalidation_strategy: InvalidationStrategy,
}

/// Cache eviction policies
#[derive(Debug, Clone)]
pub enum EvictionPolicy {
    Lru,
    Lfu,
    Arc,
    Adaptive,
}

/// Prefetch strategies
#[derive(Debug, Clone)]
pub enum PrefetchStrategy {
    None,
    Sequential,
    Predictive,
    Collaborative,
}

/// Cache invalidation strategies
#[derive(Debug, Clone)]
pub enum InvalidationStrategy {
    Ttl,
    WriteThrough,
    EventDriven,
    Adaptive,
}

/// Resource requirements for workload
#[derive(Debug, Clone)]
pub struct ResourceRequirements {
    pub min_memory: usize,
    pub max_memory: usize,
    pub cpu_cores: usize,
    pub io_bandwidth: f64,
    pub network_bandwidth: f64,
}

/// Workload transition matrix
#[derive(Debug, Clone)]

impl WorkloadClassifier {
    pub fn new() -> Self {
        Self {
            categories: HashMap::new(),
            current_workload: WorkloadCharacteristics::default(),
            transition_matrix: TransitionMatrix::new(),
            adaptive_thresholds: AdaptiveThresholds::new(),
        }
    }

    pub fn classify_workload(&mut self, algebra: &Algebra, execution_time: Duration) -> Result<()> {
        // Implementation would classify the current workload
        Ok(())
    }

    pub fn get_current_classification(&self) -> WorkloadCategory {
        WorkloadCategory {
            name: "balanced".to_string(),
            characteristics: self.current_workload.clone(),
            optimization_strategy: OptimizationStrategy::default(),
            resource_requirements: ResourceRequirements::default(),
        }
    }
}

impl Default for WorkloadCharacteristics {
    fn default() -> Self {
        Self {
            query_rate: 10.0,
            avg_complexity: 5.0,
            read_write_ratio: 0.9,
            temporal_locality: 0.7,
            data_locality: 0.8,
            concurrency_level: 4,
            resource_intensity: ResourceIntensity::default(),
        }
    }
}

impl Default for ResourceIntensity {
    fn default() -> Self {
        Self {
            cpu_intensive: 0.5,
            memory_intensive: 0.5,
            io_intensive: 0.3,
            network_intensive: 0.2,
        }
    }
}

impl Default for OptimizationStrategy {
    fn default() -> Self {
        Self {
            priority_optimizations: vec![OptimizationType::JoinReordering],
            resource_allocation: ResourceAllocation::default(),
            caching_strategy: CachingStrategy::default(),
            parallelization_factor: 2.0,
        }
    }
}

impl Default for ResourceAllocation {
    fn default() -> Self {
        Self {
            memory_allocation: 0.8,
            cpu_allocation: 0.8,
            io_bandwidth: 100.0,
            connection_pool_size: 10,
        }
    }
}

impl Default for CachingStrategy {
    fn default() -> Self {
        Self {
            cache_size: 1024 * 1024 * 100, // 100MB
            eviction_policy: EvictionPolicy::Lru,
            prefetch_strategy: PrefetchStrategy::Sequential,
            invalidation_strategy: InvalidationStrategy::Ttl,
        }
    }
}

impl Default for ResourceRequirements {
    fn default() -> Self {
        Self {
            min_memory: 1024 * 1024 * 64, // 64MB
            max_memory: 1024 * 1024 * 1024, // 1GB
            cpu_cores: 2,
            io_bandwidth: 50.0,
            network_bandwidth: 10.0,
        }
    }
}