inferno-ai 0.10.3

#![allow(dead_code, unused_imports, unused_variables)]
use anyhow::Result;
use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use std::collections::{HashMap, HashSet};
use std::sync::Arc;
use std::time::{Duration, Instant, SystemTime};
use tokio::sync::RwLock;
use uuid::Uuid;

// Configuration structures
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AdvancedCacheConfig {
    pub enabled: bool,
    pub cache_hierarchy: CacheHierarchyConfig,
    pub memory_management: MemoryManagementConfig,
    pub eviction_policies: EvictionPolicyConfig,
    pub prefetching: PrefetchingConfig,
    pub compression: CompressionConfig,
    pub persistence: PersistenceConfig,
    pub distributed: DistributedCacheConfig,
    pub monitoring: CacheMonitoringConfig,
    pub optimization: CacheOptimizationConfig,
    pub security: CacheSecurityConfig,
    pub tiering: TieringConfig,
    pub coherence: CoherenceConfig,
    pub partitioning: PartitioningConfig,
    pub warming: CacheWarmingConfig,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheHierarchyConfig {
    pub l1_cache: L1CacheConfig,
    pub l2_cache: L2CacheConfig,
    pub l3_cache: L3CacheConfig,
    pub external_cache: ExternalCacheConfig,
    pub cache_line_size: usize,
    pub associativity: usize,
    pub write_policy: WritePolicy,
    pub inclusion_policy: InclusionPolicy,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct L1CacheConfig {
    pub size_bytes: usize,
    pub latency_ns: u64,
    pub ways: usize,
    pub line_size: usize,
    pub replacement_policy: ReplacementPolicy,
    pub prefetch_enabled: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct L2CacheConfig {
    pub size_bytes: usize,
    pub latency_ns: u64,
    pub ways: usize,
    pub line_size: usize,
    pub replacement_policy: ReplacementPolicy,
    pub shared: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct L3CacheConfig {
    pub size_bytes: usize,
    pub latency_ns: u64,
    pub ways: usize,
    pub line_size: usize,
    pub replacement_policy: ReplacementPolicy,
    pub inclusive: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExternalCacheConfig {
    pub cache_type: ExternalCacheType,
    pub connection_pool_size: usize,
    pub timeout_ms: u64,
    pub retry_policy: RetryPolicy,
    pub circuit_breaker: CircuitBreakerConfig,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ExternalCacheType {
    Redis,
    Memcached,
    Hazelcast,
    Ignite,
    Coherence,
    Custom(String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum WritePolicy {
    WriteThrough,
    WriteBack,
    WriteAround,
    WriteCombining,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum InclusionPolicy {
    Inclusive,
    Exclusive,
    NonInclusive,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ReplacementPolicy {
    Lru,        // Least Recently Used
    Lfu,        // Least Frequently Used
    Mru,        // Most Recently Used
    Fifo,       // First In First Out
    Lifo,       // Last In First Out
    Random,     // Random Replacement
    Arc,        // Adaptive Replacement Cache
    TwoQ,       // Two Queue
    Slru,       // Segmented LRU
    Tlru,       // Time-aware LRU
    Plru,       // Pseudo-LRU
    Clock,      // Clock algorithm
    ClockPro,   // Clock-Pro algorithm
    Lirs,       // Low Inter-reference Recency Set
    MultiQueue, // Multi-Queue replacement
    Gdsf,       // Greedy Dual Size Frequency
    Lfuda,      // LFU with Dynamic Aging
    Custom(String),
}

// Memory Management Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryManagementConfig {
    pub total_memory_bytes: usize,
    pub max_object_size: usize,
    pub memory_allocator: MemoryAllocator,
    pub garbage_collection: GarbageCollectionConfig,
    pub memory_pooling: MemoryPoolingConfig,
    pub numa_aware: bool,
    pub huge_pages: bool,
    pub memory_compression: bool,
    pub swap_enabled: bool,
    pub memory_limits: MemoryLimitsConfig,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum MemoryAllocator {
    System,
    Jemalloc,
    Mimalloc,
    Tcmalloc,
    Custom(String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GarbageCollectionConfig {
    pub enabled: bool,
    pub gc_type: GarbageCollectorType,
    pub trigger_threshold: f32,
    pub collection_interval: Duration,
    pub generational: bool,
    pub concurrent: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum GarbageCollectorType {
    MarkSweep,
    MarkCompact,
    Copying,
    Generational,
    Incremental,
    Concurrent,
    ReferenceCountin,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryPoolingConfig {
    pub enabled: bool,
    pub pool_sizes: Vec<PoolSize>,
    pub max_pools: usize,
    pub pool_growth_strategy: GrowthStrategy,
    pub reclaim_policy: ReclaimPolicy,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PoolSize {
    pub object_size: usize,
    pub initial_count: usize,
    pub max_count: usize,
    pub growth_factor: f32,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum GrowthStrategy {
    Linear,
    Exponential,
    Fibonacci,
    Custom(String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ReclaimPolicy {
    Immediate,
    Lazy,
    Periodic,
    Threshold,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryLimitsConfig {
    pub soft_limit: usize,
    pub hard_limit: usize,
    pub oom_handler: OomHandler,
    pub memory_pressure_threshold: f32,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum OomHandler {
    Panic,
    Evict,
    Compress,
    Swap,
    Custom(String),
}

// Eviction Policy Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EvictionPolicyConfig {
    pub default_policy: EvictionPolicy,
    pub ttl_enabled: bool,
    pub ttl_seconds: u64,
    pub max_entries: usize,
    pub max_size_bytes: usize,
    pub eviction_batch_size: usize,
    pub scan_frequency: Duration,
    pub adaptive_eviction: bool,
    pub priority_eviction: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum EvictionPolicy {
    Lru,
    Lfu,
    Ttl,
    Size,
    Random,
    Fifo,
    Priority,
    Adaptive,
    Custom(String),
}

// Prefetching Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PrefetchingConfig {
    pub enabled: bool,
    pub prefetch_strategy: PrefetchStrategy,
    pub prefetch_distance: usize,
    pub prefetch_degree: usize,
    pub adaptive_prefetching: bool,
    pub pattern_detection: bool,
    pub confidence_threshold: f32,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PrefetchStrategy {
    Sequential,
    Strided,
    Random,
    Markov,
    Neural,
    Hybrid,
    Custom(String),
}

// Compression Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompressionConfig {
    pub enabled: bool,
    pub algorithm: CompressionAlgorithm,
    pub compression_level: u32,
    pub min_size_bytes: usize,
    pub compression_ratio_threshold: f32,
    pub adaptive_compression: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum CompressionAlgorithm {
    None,
    Gzip,
    Zstd,
    Lz4,
    Snappy,
    Brotli,
    Lzma,
    Custom(String),
}

// Persistence Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PersistenceConfig {
    pub enabled: bool,
    pub persistence_type: PersistenceType,
    pub checkpoint_interval: Duration,
    pub wal_enabled: bool,
    pub sync_writes: bool,
    pub compression_enabled: bool,
    pub encryption_enabled: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PersistenceType {
    None,
    FileSystem,
    Database,
    ObjectStore,
    Hybrid,
}

// Distributed Cache Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DistributedCacheConfig {
    pub enabled: bool,
    pub topology: CacheTopology,
    pub consistency_level: ConsistencyLevel,
    pub replication_factor: usize,
    pub partitioning_strategy: PartitioningStrategy,
    pub gossip_protocol: bool,
    pub failure_detection: FailureDetectionConfig,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum CacheTopology {
    Standalone,
    Replicated,
    Partitioned,
    NearCache,
    Federated,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ConsistencyLevel {
    Strong,
    Eventual,
    Weak,
    Causal,
    Sequential,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PartitioningStrategy {
    Hash,
    Range,
    List,
    Composite,
    ConsistentHash,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FailureDetectionConfig {
    pub enabled: bool,
    pub heartbeat_interval: Duration,
    pub failure_threshold: u32,
    pub recovery_strategy: RecoveryStrategy,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RecoveryStrategy {
    Failover,
    Rebuild,
    Redistribute,
    Ignore,
}

// Cache Monitoring Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheMonitoringConfig {
    pub metrics_enabled: bool,
    pub metrics_interval: Duration,
    pub trace_enabled: bool,
    pub sampling_rate: f32,
    pub alert_thresholds: AlertThresholds,
    pub export_metrics: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AlertThresholds {
    pub hit_rate_min: f32,
    pub eviction_rate_max: f32,
    pub latency_p99_max: Duration,
    pub memory_usage_max: f32,
}

// Cache Optimization Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheOptimizationConfig {
    pub auto_tuning: bool,
    pub ml_optimization: bool,
    pub workload_prediction: bool,
    pub adaptive_sizing: bool,
    pub hot_key_detection: bool,
    pub optimization_interval: Duration,
}

// Cache Security Configuration
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct CacheSecurityConfig {
    pub encryption_at_rest: bool,
    pub encryption_in_transit: bool,
    pub authentication_required: bool,
    pub authorization_enabled: bool,
    pub audit_logging: bool,
    pub secure_deletion: bool,
}

// Tiering Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TieringConfig {
    pub enabled: bool,
    pub tiers: Vec<CacheTier>,
    pub promotion_policy: PromotionPolicy,
    pub demotion_policy: DemotionPolicy,
    pub migration_threshold: f32,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheTier {
    pub tier_id: String,
    pub tier_type: TierType,
    pub capacity_bytes: usize,
    pub latency_ms: u64,
    pub cost_per_gb: f32,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TierType {
    Memory,
    Ssd,
    Disk,
    Network,
    Cloud,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PromotionPolicy {
    Frequency,
    Recency,
    Size,
    Cost,
    Hybrid,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum DemotionPolicy {
    Lru,
    Ttl,
    Size,
    Cost,
    Custom,
}

// Coherence Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CoherenceConfig {
    pub protocol: CoherenceProtocol,
    pub invalidation_strategy: InvalidationStrategy,
    pub update_propagation: UpdatePropagation,
    pub conflict_resolution: ConflictResolution,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum CoherenceProtocol {
    Msi,   // Modified, Shared, Invalid
    Mesi,  // Modified, Exclusive, Shared, Invalid
    Moesi, // Modified, Owned, Exclusive, Shared, Invalid
    Mesif, // Modified, Exclusive, Shared, Invalid, Forward
    Dragon,
    Custom(String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum InvalidationStrategy {
    Immediate,
    Lazy,
    Batch,
    Selective,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum UpdatePropagation {
    Synchronous,
    Asynchronous,
    Batch,
    Selective,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ConflictResolution {
    LastWrite,
    FirstWrite,
    Merge,
    Custom,
}

// Partitioning Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PartitioningConfig {
    pub enabled: bool,
    pub num_partitions: usize,
    pub partition_strategy: PartitionStrategy,
    pub rebalancing_enabled: bool,
    pub rebalancing_threshold: f32,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PartitionStrategy {
    Hash,
    Range,
    List,
    Round,
    Consistent,
    Rendezvous,
}

// Cache Warming Configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheWarmingConfig {
    pub enabled: bool,
    pub warming_strategy: WarmingStrategy,
    pub warming_sources: Vec<WarmingSource>,
    pub parallel_warming: bool,
    pub warming_batch_size: usize,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum WarmingStrategy {
    Eager,
    Lazy,
    Predictive,
    Scheduled,
    OnDemand,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WarmingSource {
    pub source_type: SourceType,
    pub location: String,
    pub filter: Option<String>,
    pub priority: u8,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum SourceType {
    Database,
    File,
    Api,
    Cache,
    Custom,
}

// Additional helper structures
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RetryPolicy {
    pub max_retries: u32,
    pub initial_delay_ms: u64,
    pub max_delay_ms: u64,
    pub backoff_multiplier: f32,
    pub jitter: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CircuitBreakerConfig {
    pub enabled: bool,
    pub failure_threshold: u32,
    pub success_threshold: u32,
    pub timeout: Duration,
    pub half_open_max_calls: u32,
}

// Core cache entry structure
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheEntry<T> {
    pub key: String,
    pub value: T,
    pub metadata: EntryMetadata,
    pub stats: EntryStatistics,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EntryMetadata {
    pub created_at: SystemTime,
    pub updated_at: SystemTime,
    pub accessed_at: SystemTime,
    pub expires_at: Option<SystemTime>,
    pub size_bytes: usize,
    pub compression_ratio: Option<f32>,
    pub tier: TierType,
    pub priority: u8,
    pub tags: HashSet<String>,
    pub tenant_id: Option<Uuid>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EntryStatistics {
    pub access_count: u64,
    pub hit_count: u64,
    pub miss_count: u64,
    pub avg_latency_ns: u64,
    pub last_access_duration: Duration,
    pub cpu_time_ns: u64,
    pub io_bytes: u64,
}

// Cache statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheStatistics {
    pub total_entries: usize,
    pub total_size_bytes: usize,
    pub hit_count: u64,
    pub miss_count: u64,
    pub eviction_count: u64,
    pub admission_count: u64,
    pub hit_rate: f64,
    pub avg_latency_ns: u64,
    pub p50_latency_ns: u64,
    pub p95_latency_ns: u64,
    pub p99_latency_ns: u64,
    pub memory_usage_bytes: usize,
    pub cpu_usage_percent: f32,
    pub tier_stats: HashMap<String, TierStatistics>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TierStatistics {
    pub entries: usize,
    pub size_bytes: usize,
    pub hit_rate: f64,
    pub avg_latency_ns: u64,
    pub promotions: u64,
    pub demotions: u64,
}

// Memory statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryStatistics {
    pub total_allocated: usize,
    pub total_used: usize,
    pub total_free: usize,
    pub fragmentation_ratio: f32,
    pub allocation_rate: f64,
    pub deallocation_rate: f64,
    pub gc_count: u64,
    pub gc_pause_ms: u64,
    pub pool_stats: HashMap<String, PoolStatistics>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PoolStatistics {
    pub pool_size: usize,
    pub objects_allocated: usize,
    pub objects_free: usize,
    pub allocation_count: u64,
    pub deallocation_count: u64,
}

// Eviction statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EvictionStatistics {
    pub total_evicted: u64,
    pub eviction_rate: f64,
    pub eviction_by_policy: HashMap<String, u64>,
    pub eviction_by_reason: HashMap<String, u64>,
    pub avg_entry_lifetime: Duration,
    pub youngest_evicted_age: Duration,
    pub oldest_evicted_age: Duration,
}

// Prefetch statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PrefetchStatistics {
    pub prefetch_count: u64,
    pub prefetch_hits: u64,
    pub prefetch_accuracy: f64,
    pub prefetch_coverage: f64,
    pub prefetch_timeliness: f64,
    pub wasted_prefetches: u64,
    pub pattern_matches: HashMap<String, u64>,
}

// Cache operations
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum CacheOperation {
    Get(String),
    Put(String, Vec<u8>),
    Update(String, Vec<u8>),
    Delete(String),
    Clear,
    Flush,
    Invalidate(String),
    Touch(String),
    Prefetch(Vec<String>),
    Evict(usize),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheOperationResult {
    pub operation: CacheOperation,
    pub success: bool,
    pub latency_ns: u64,
    pub bytes_affected: usize,
    pub error: Option<String>,
}

// Cache events
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum CacheEvent {
    Hit(String),
    Miss(String),
    Eviction(String, EvictionReason),
    Admission(String),
    Promotion(String, TierType, TierType),
    Demotion(String, TierType, TierType),
    Invalidation(String),
    Expiration(String),
    Rebalance(Vec<String>),
    Error(String, String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum EvictionReason {
    Capacity,
    Ttl,
    Policy,
    Manual,
    Memory,
    Invalidation,
}

// Hot key detection
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HotKey {
    pub key: String,
    pub access_count: u64,
    pub access_rate: f64,
    pub last_access: SystemTime,
    pub detection_time: SystemTime,
    pub heat_score: f64,
}

// Workload pattern
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkloadPattern {
    pub pattern_type: PatternType,
    pub confidence: f64,
    pub parameters: HashMap<String, f64>,
    pub detected_at: SystemTime,
    pub sample_count: usize,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PatternType {
    Sequential,
    Random,
    Temporal,
    Spatial,
    Zipfian,
    Gaussian,
    Periodic,
    Bursty,
    Mixed,
}

// Cache optimization recommendations
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OptimizationRecommendation {
    pub recommendation_type: RecommendationType,
    pub description: String,
    pub impact_estimate: ImpactEstimate,
    pub confidence: f64,
    pub priority: u8,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RecommendationType {
    ResizeCache,
    ChangeEvictionPolicy,
    EnablePrefetching,
    AdjustTtl,
    EnableCompression,
    PromoteHotKeys,
    PartitionData,
    ChangeTier,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ImpactEstimate {
    pub hit_rate_improvement: f64,
    pub latency_reduction: f64,
    pub memory_savings: f64,
    pub cost_reduction: f64,
}

// Memory pressure handling
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryPressure {
    pub level: PressureLevel,
    pub memory_usage_percent: f32,
    pub available_bytes: usize,
    pub pressure_score: f64,
    pub recommended_action: PressureAction,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PressureLevel {
    None,
    Low,
    Medium,
    High,
    Critical,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PressureAction {
    None,
    EvictCold,
    CompressData,
    DemoteTiers,
    EmergencyEvict,
    Throttle,
}

// Cache node information for distributed setup
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheNode {
    pub node_id: String,
    pub address: String,
    pub status: NodeStatus,
    pub capacity: usize,
    pub used: usize,
    pub replicas: Vec<String>,
    pub partitions: Vec<u32>,
    pub last_heartbeat: SystemTime,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum NodeStatus {
    Active,
    Inactive,
    Joining,
    Leaving,
    Failed,
}

// Data replication
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReplicationStatus {
    pub primary: String,
    pub replicas: Vec<String>,
    pub sync_status: SyncStatus,
    pub lag_bytes: usize,
    pub lag_operations: u64,
    pub last_sync: SystemTime,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum SyncStatus {
    InSync,
    Catching,
    Lagging,
    Disconnected,
}

// Backup and restore
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheBackup {
    pub backup_id: Uuid,
    pub timestamp: SystemTime,
    pub size_bytes: usize,
    pub entry_count: usize,
    pub backup_type: BackupType,
    pub location: String,
    pub compression: bool,
    pub encryption: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum BackupType {
    Full,
    Incremental,
    Differential,
    Snapshot,
}

// Cache migration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MigrationTask {
    pub task_id: Uuid,
    pub source: String,
    pub destination: String,
    pub keys: Vec<String>,
    pub status: MigrationStatus,
    pub progress: f32,
    pub started_at: SystemTime,
    pub estimated_completion: SystemTime,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum MigrationStatus {
    Pending,
    Running,
    Completed,
    Failed,
    Cancelled,
}

// Traits for cache operations
#[async_trait]
pub trait CacheBackend: Send + Sync {
    async fn get(&self, key: &str) -> Result<Option<Vec<u8>>>;
    async fn put(&self, key: &str, value: Vec<u8>, ttl: Option<Duration>) -> Result<()>;
    async fn delete(&self, key: &str) -> Result<bool>;
    async fn exists(&self, key: &str) -> Result<bool>;
    async fn clear(&self) -> Result<()>;
    async fn size(&self) -> Result<usize>;
    async fn keys(&self) -> Result<Vec<String>>;
}

#[async_trait]
pub trait EvictionPolicyTrait: Send + Sync {
    async fn should_evict(&self, entry: &EntryMetadata) -> bool;
    async fn select_victim(&self, entries: &[EntryMetadata]) -> Option<String>;
    async fn on_access(&mut self, key: &str);
    async fn on_eviction(&mut self, key: &str);
}

#[async_trait]
pub trait PrefetchStrategyTrait: Send + Sync {
    async fn predict_next(&self, history: &[String]) -> Vec<String>;
    async fn should_prefetch(&self, key: &str) -> bool;
    async fn update_model(&mut self, actual: &str, predicted: &[String]);
}

#[async_trait]
pub trait CompressionEngine: Send + Sync {
    async fn compress(&self, data: &[u8]) -> Result<Vec<u8>>;
    async fn decompress(&self, data: &[u8]) -> Result<Vec<u8>>;
    fn compression_ratio(&self, original: usize, compressed: usize) -> f32;
}

#[async_trait]
pub trait CacheMonitor: Send + Sync {
    async fn record_hit(&mut self, key: &str, latency: Duration);
    async fn record_miss(&mut self, key: &str, latency: Duration);
    async fn record_eviction(&mut self, key: &str, reason: EvictionReason);
    async fn get_statistics(&self) -> CacheStatistics;
    async fn get_alerts(&self) -> Vec<Alert>;
}

#[async_trait]
pub trait CacheOptimizer: Send + Sync {
    async fn analyze_workload(&self, operations: &[CacheOperation]) -> WorkloadPattern;
    async fn recommend_optimizations(
        &self,
        stats: &CacheStatistics,
    ) -> Vec<OptimizationRecommendation>;
    async fn auto_tune(&mut self, config: &mut AdvancedCacheConfig);
    async fn detect_hot_keys(&self, stats: &CacheStatistics) -> Vec<HotKey>;
}

// Alert structure
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Alert {
    pub alert_id: Uuid,
    pub alert_type: AlertType,
    pub severity: AlertSeverity,
    pub message: String,
    pub timestamp: SystemTime,
    pub resolved: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum AlertType {
    HitRateLow,
    EvictionRateHigh,
    LatencyHigh,
    MemoryHigh,
    NodeFailure,
    ReplicationLag,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum AlertSeverity {
    Info,
    Warning,
    Error,
    Critical,
}

// Implementation defaults
impl Default for AdvancedCacheConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            cache_hierarchy: CacheHierarchyConfig::default(),
            memory_management: MemoryManagementConfig::default(),
            eviction_policies: EvictionPolicyConfig::default(),
            prefetching: PrefetchingConfig::default(),
            compression: CompressionConfig::default(),
            persistence: PersistenceConfig::default(),
            distributed: DistributedCacheConfig::default(),
            monitoring: CacheMonitoringConfig::default(),
            optimization: CacheOptimizationConfig::default(),
            security: CacheSecurityConfig::default(),
            tiering: TieringConfig::default(),
            coherence: CoherenceConfig::default(),
            partitioning: PartitioningConfig::default(),
            warming: CacheWarmingConfig::default(),
        }
    }
}

impl Default for CacheHierarchyConfig {
    fn default() -> Self {
        Self {
            l1_cache: L1CacheConfig::default(),
            l2_cache: L2CacheConfig::default(),
            l3_cache: L3CacheConfig::default(),
            external_cache: ExternalCacheConfig::default(),
            cache_line_size: 64,
            associativity: 8,
            write_policy: WritePolicy::WriteBack,
            inclusion_policy: InclusionPolicy::Inclusive,
        }
    }
}

impl Default for L1CacheConfig {
    fn default() -> Self {
        Self {
            size_bytes: 32 * 1024, // 32 KB
            latency_ns: 1,
            ways: 8,
            line_size: 64,
            replacement_policy: ReplacementPolicy::Lru,
            prefetch_enabled: true,
        }
    }
}

impl Default for L2CacheConfig {
    fn default() -> Self {
        Self {
            size_bytes: 256 * 1024, // 256 KB
            latency_ns: 10,
            ways: 8,
            line_size: 64,
            replacement_policy: ReplacementPolicy::Lru,
            shared: false,
        }
    }
}

impl Default for L3CacheConfig {
    fn default() -> Self {
        Self {
            size_bytes: 8 * 1024 * 1024, // 8 MB
            latency_ns: 30,
            ways: 16,
            line_size: 64,
            replacement_policy: ReplacementPolicy::Lru,
            inclusive: true,
        }
    }
}

impl Default for ExternalCacheConfig {
    fn default() -> Self {
        Self {
            cache_type: ExternalCacheType::Redis,
            connection_pool_size: 10,
            timeout_ms: 1000,
            retry_policy: RetryPolicy::default(),
            circuit_breaker: CircuitBreakerConfig::default(),
        }
    }
}

impl Default for MemoryManagementConfig {
    fn default() -> Self {
        Self {
            total_memory_bytes: 1024 * 1024 * 1024, // 1 GB
            max_object_size: 10 * 1024 * 1024,      // 10 MB
            memory_allocator: MemoryAllocator::System,
            garbage_collection: GarbageCollectionConfig::default(),
            memory_pooling: MemoryPoolingConfig::default(),
            numa_aware: false,
            huge_pages: false,
            memory_compression: false,
            swap_enabled: false,
            memory_limits: MemoryLimitsConfig::default(),
        }
    }
}

impl Default for GarbageCollectionConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            gc_type: GarbageCollectorType::Generational,
            trigger_threshold: 0.8,
            collection_interval: Duration::from_secs(60),
            generational: true,
            concurrent: true,
        }
    }
}

impl Default for MemoryPoolingConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            pool_sizes: vec![
                PoolSize {
                    object_size: 64,
                    initial_count: 1000,
                    max_count: 10000,
                    growth_factor: 2.0,
                },
                PoolSize {
                    object_size: 256,
                    initial_count: 500,
                    max_count: 5000,
                    growth_factor: 2.0,
                },
                PoolSize {
                    object_size: 1024,
                    initial_count: 100,
                    max_count: 1000,
                    growth_factor: 1.5,
                },
            ],
            max_pools: 10,
            pool_growth_strategy: GrowthStrategy::Exponential,
            reclaim_policy: ReclaimPolicy::Lazy,
        }
    }
}

impl Default for MemoryLimitsConfig {
    fn default() -> Self {
        Self {
            soft_limit: 800 * 1024 * 1024,  // 800 MB
            hard_limit: 1024 * 1024 * 1024, // 1 GB
            oom_handler: OomHandler::Evict,
            memory_pressure_threshold: 0.9,
        }
    }
}

impl Default for EvictionPolicyConfig {
    fn default() -> Self {
        Self {
            default_policy: EvictionPolicy::Lru,
            ttl_enabled: true,
            ttl_seconds: 3600,
            max_entries: 1000000,
            max_size_bytes: 1024 * 1024 * 1024,
            eviction_batch_size: 100,
            scan_frequency: Duration::from_secs(10),
            adaptive_eviction: true,
            priority_eviction: false,
        }
    }
}

impl Default for PrefetchingConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            prefetch_strategy: PrefetchStrategy::Sequential,
            prefetch_distance: 1,
            prefetch_degree: 4,
            adaptive_prefetching: true,
            pattern_detection: true,
            confidence_threshold: 0.8,
        }
    }
}

impl Default for CompressionConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            algorithm: CompressionAlgorithm::Lz4,
            compression_level: 3,
            min_size_bytes: 1024,
            compression_ratio_threshold: 0.8,
            adaptive_compression: true,
        }
    }
}

impl Default for PersistenceConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            persistence_type: PersistenceType::FileSystem,
            checkpoint_interval: Duration::from_secs(300),
            wal_enabled: true,
            sync_writes: false,
            compression_enabled: true,
            encryption_enabled: false,
        }
    }
}

impl Default for DistributedCacheConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            topology: CacheTopology::Standalone,
            consistency_level: ConsistencyLevel::Eventual,
            replication_factor: 3,
            partitioning_strategy: PartitioningStrategy::ConsistentHash,
            gossip_protocol: true,
            failure_detection: FailureDetectionConfig::default(),
        }
    }
}

impl Default for FailureDetectionConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            heartbeat_interval: Duration::from_secs(5),
            failure_threshold: 3,
            recovery_strategy: RecoveryStrategy::Failover,
        }
    }
}

impl Default for CacheMonitoringConfig {
    fn default() -> Self {
        Self {
            metrics_enabled: true,
            metrics_interval: Duration::from_secs(60),
            trace_enabled: false,
            sampling_rate: 0.01,
            alert_thresholds: AlertThresholds::default(),
            export_metrics: false,
        }
    }
}

impl Default for AlertThresholds {
    fn default() -> Self {
        Self {
            hit_rate_min: 0.8,
            eviction_rate_max: 0.1,
            latency_p99_max: Duration::from_millis(100),
            memory_usage_max: 0.9,
        }
    }
}

impl Default for CacheOptimizationConfig {
    fn default() -> Self {
        Self {
            auto_tuning: false,
            ml_optimization: false,
            workload_prediction: false,
            adaptive_sizing: true,
            hot_key_detection: true,
            optimization_interval: Duration::from_secs(3600),
        }
    }
}

impl Default for TieringConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            tiers: vec![
                CacheTier {
                    tier_id: "memory".to_string(),
                    tier_type: TierType::Memory,
                    capacity_bytes: 1024 * 1024 * 1024,
                    latency_ms: 1,
                    cost_per_gb: 10.0,
                },
                CacheTier {
                    tier_id: "ssd".to_string(),
                    tier_type: TierType::Ssd,
                    capacity_bytes: 10 * 1024 * 1024 * 1024,
                    latency_ms: 10,
                    cost_per_gb: 1.0,
                },
            ],
            promotion_policy: PromotionPolicy::Frequency,
            demotion_policy: DemotionPolicy::Lru,
            migration_threshold: 0.8,
        }
    }
}

impl Default for CoherenceConfig {
    fn default() -> Self {
        Self {
            protocol: CoherenceProtocol::Mesi,
            invalidation_strategy: InvalidationStrategy::Immediate,
            update_propagation: UpdatePropagation::Asynchronous,
            conflict_resolution: ConflictResolution::LastWrite,
        }
    }
}

impl Default for PartitioningConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            num_partitions: 16,
            partition_strategy: PartitionStrategy::Consistent,
            rebalancing_enabled: true,
            rebalancing_threshold: 0.2,
        }
    }
}

impl Default for CacheWarmingConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            warming_strategy: WarmingStrategy::Lazy,
            warming_sources: Vec::new(),
            parallel_warming: true,
            warming_batch_size: 100,
        }
    }
}

impl Default for RetryPolicy {
    fn default() -> Self {
        Self {
            max_retries: 3,
            initial_delay_ms: 100,
            max_delay_ms: 10000,
            backoff_multiplier: 2.0,
            jitter: true,
        }
    }
}

impl Default for CircuitBreakerConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            failure_threshold: 5,
            success_threshold: 2,
            timeout: Duration::from_secs(60),
            half_open_max_calls: 3,
        }
    }
}

// Main cache system implementation
pub struct AdvancedCacheSystem {
    config: AdvancedCacheConfig,
    cache_backend: Arc<dyn CacheBackend>,
    eviction_policy: Arc<RwLock<EvictionPolicy>>,
    prefetch_strategy: Arc<RwLock<PrefetchStrategy>>,
    compression_engine: Arc<dyn CompressionEngine>,
    monitor: Arc<RwLock<dyn CacheMonitor>>,
    optimizer: Arc<RwLock<dyn CacheOptimizer>>,
    statistics: Arc<RwLock<CacheStatistics>>,
    memory_stats: Arc<RwLock<MemoryStatistics>>,
    hot_keys: Arc<RwLock<Vec<HotKey>>>,
}

impl AdvancedCacheSystem {
    pub fn new(
        config: AdvancedCacheConfig,
        backend: Arc<dyn CacheBackend>,
        eviction: Arc<RwLock<EvictionPolicy>>,
        prefetch: Arc<RwLock<PrefetchStrategy>>,
        compression: Arc<dyn CompressionEngine>,
        monitor: Arc<RwLock<dyn CacheMonitor>>,
        optimizer: Arc<RwLock<dyn CacheOptimizer>>,
    ) -> Self {
        Self {
            config,
            cache_backend: backend,
            eviction_policy: eviction,
            prefetch_strategy: prefetch,
            compression_engine: compression,
            monitor,
            optimizer,
            statistics: Arc::new(RwLock::new(CacheStatistics {
                total_entries: 0,
                total_size_bytes: 0,
                hit_count: 0,
                miss_count: 0,
                eviction_count: 0,
                admission_count: 0,
                hit_rate: 0.0,
                avg_latency_ns: 0,
                p50_latency_ns: 0,
                p95_latency_ns: 0,
                p99_latency_ns: 0,
                memory_usage_bytes: 0,
                cpu_usage_percent: 0.0,
                tier_stats: HashMap::new(),
            })),
            memory_stats: Arc::new(RwLock::new(MemoryStatistics {
                total_allocated: 0,
                total_used: 0,
                total_free: 0,
                fragmentation_ratio: 0.0,
                allocation_rate: 0.0,
                deallocation_rate: 0.0,
                gc_count: 0,
                gc_pause_ms: 0,
                pool_stats: HashMap::new(),
            })),
            hot_keys: Arc::new(RwLock::new(Vec::new())),
        }
    }

    pub async fn get(&self, key: &str) -> Result<Option<Vec<u8>>> {
        let start = Instant::now();

        let result = self.cache_backend.get(key).await?;

        let latency = start.elapsed();
        let mut monitor = self.monitor.write().await;

        if result.is_some() {
            monitor.record_hit(key, latency).await;
            let mut stats = self.statistics.write().await;
            stats.hit_count += 1;

            // Note: Eviction policy tracking would be handled by the cache backend implementation
        } else {
            monitor.record_miss(key, latency).await;
            let mut stats = self.statistics.write().await;
            stats.miss_count += 1;
        }

        Ok(result)
    }

    pub async fn put(&self, key: &str, value: Vec<u8>, ttl: Option<Duration>) -> Result<()> {
        // Check memory pressure
        if self.should_evict().await? {
            self.evict_entries(self.config.eviction_policies.eviction_batch_size)
                .await?;
        }

        // Compress if needed
        let final_value = if self.config.compression.enabled
            && value.len() >= self.config.compression.min_size_bytes
        {
            self.compression_engine.compress(&value).await?
        } else {
            value
        };

        self.cache_backend.put(key, final_value, ttl).await?;

        let mut stats = self.statistics.write().await;
        stats.admission_count += 1;
        stats.total_entries += 1;

        Ok(())
    }

    pub async fn delete(&self, key: &str) -> Result<bool> {
        self.cache_backend.delete(key).await
    }

    pub async fn clear(&self) -> Result<()> {
        self.cache_backend.clear().await?;

        let mut stats = self.statistics.write().await;
        stats.total_entries = 0;
        stats.total_size_bytes = 0;

        Ok(())
    }

    async fn should_evict(&self) -> Result<bool> {
        let stats = self.memory_stats.read().await;
        let usage_ratio =
            stats.total_used as f64 / self.config.memory_management.total_memory_bytes as f64;

        Ok(usage_ratio
            >= self
                .config
                .memory_management
                .memory_limits
                .memory_pressure_threshold as f64)
    }

    async fn evict_entries(&self, count: usize) -> Result<()> {
        let keys = self.cache_backend.keys().await?;

        // This is a simplified eviction - in production, would use proper metadata
        for key in keys.iter().take(count) {
            self.cache_backend.delete(key).await?;

            let mut monitor = self.monitor.write().await;
            monitor.record_eviction(key, EvictionReason::Capacity).await;

            let mut stats = self.statistics.write().await;
            stats.eviction_count += 1;
            stats.total_entries = stats.total_entries.saturating_sub(1);
        }

        Ok(())
    }

    pub async fn get_statistics(&self) -> CacheStatistics {
        self.statistics.read().await.clone()
    }

    pub async fn get_memory_statistics(&self) -> MemoryStatistics {
        self.memory_stats.read().await.clone()
    }

    pub async fn detect_hot_keys(&self) -> Result<Vec<HotKey>> {
        let stats = self.statistics.read().await.clone();
        let optimizer = self.optimizer.read().await;
        Ok(optimizer.detect_hot_keys(&stats).await)
    }

    pub async fn optimize(&mut self) -> Result<Vec<OptimizationRecommendation>> {
        let stats = self.statistics.read().await.clone();
        let mut optimizer = self.optimizer.write().await;

        let recommendations = optimizer.recommend_optimizations(&stats).await;

        if self.config.optimization.auto_tuning {
            optimizer.auto_tune(&mut self.config).await;
        }

        Ok(recommendations)
    }

    pub async fn warm_cache(&self, sources: Vec<WarmingSource>) -> Result<usize> {
        // Simplified cache warming
        let mut warmed = 0;

        for source in sources {
            match source.source_type {
                SourceType::File => {
                    // Load from file
                    warmed += 1;
                }
                SourceType::Database => {
                    // Load from database
                    warmed += 1;
                }
                _ => {}
            }
        }

        Ok(warmed)
    }

    pub async fn backup(&self) -> Result<CacheBackup> {
        let backup_id = Uuid::new_v4();
        let timestamp = SystemTime::now();

        Ok(CacheBackup {
            backup_id,
            timestamp,
            size_bytes: self.statistics.read().await.total_size_bytes,
            entry_count: self.statistics.read().await.total_entries,
            backup_type: BackupType::Full,
            location: "/backup/cache".to_string(),
            compression: true,
            encryption: false,
        })
    }

    pub async fn restore(&self, backup: &CacheBackup) -> Result<()> {
        // Simplified restore
        println!("Restoring cache from backup: {}", backup.backup_id);
        Ok(())
    }
}

// Mock implementations for testing
pub struct MockCacheBackend {
    data: Arc<RwLock<HashMap<String, Vec<u8>>>>,
}

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

impl MockCacheBackend {
    pub fn new() -> Self {
        Self {
            data: Arc::new(RwLock::new(HashMap::new())),
        }
    }
}

#[async_trait]
impl CacheBackend for MockCacheBackend {
    async fn get(&self, key: &str) -> Result<Option<Vec<u8>>> {
        Ok(self.data.read().await.get(key).cloned())
    }

    async fn put(&self, key: &str, value: Vec<u8>, _ttl: Option<Duration>) -> Result<()> {
        self.data.write().await.insert(key.to_string(), value);
        Ok(())
    }

    async fn delete(&self, key: &str) -> Result<bool> {
        Ok(self.data.write().await.remove(key).is_some())
    }

    async fn exists(&self, key: &str) -> Result<bool> {
        Ok(self.data.read().await.contains_key(key))
    }

    async fn clear(&self) -> Result<()> {
        self.data.write().await.clear();
        Ok(())
    }

    async fn size(&self) -> Result<usize> {
        Ok(self.data.read().await.len())
    }

    async fn keys(&self) -> Result<Vec<String>> {
        Ok(self.data.read().await.keys().cloned().collect())
    }
}

pub struct MockEvictionPolicy {
    access_counts: HashMap<String, u64>,
}

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

impl MockEvictionPolicy {
    pub fn new() -> Self {
        Self {
            access_counts: HashMap::new(),
        }
    }
}

/* Commented out - EvictionPolicy is an enum, not a trait
#[async_trait]
impl EvictionPolicyTrait for MockEvictionPolicy {
    async fn should_evict(&self, _entry: &EntryMetadata) -> bool {
        false
    }

    async fn select_victim(&self, entries: &[EntryMetadata]) -> Option<String> {
        entries.first().map(|_| "victim_key".to_string())
    }

    async fn on_access(&mut self, key: &str) {
        *self.access_counts.entry(key.to_string()).or_insert(0) += 1;
    }

    async fn on_eviction(&mut self, key: &str) {
        self.access_counts.remove(key);
    }
}
*/

pub struct MockPrefetchStrategy;

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

impl MockPrefetchStrategy {
    pub fn new() -> Self {
        Self
    }
}

#[async_trait]
impl PrefetchStrategyTrait for MockPrefetchStrategy {
    async fn predict_next(&self, _history: &[String]) -> Vec<String> {
        vec![]
    }

    async fn should_prefetch(&self, _key: &str) -> bool {
        false
    }

    async fn update_model(&mut self, _actual: &str, _predicted: &[String]) {
        // No-op
    }
}

pub struct MockCompressionEngine;

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

impl MockCompressionEngine {
    pub fn new() -> Self {
        Self
    }
}

#[async_trait]
impl CompressionEngine for MockCompressionEngine {
    async fn compress(&self, data: &[u8]) -> Result<Vec<u8>> {
        Ok(data.to_vec())
    }

    async fn decompress(&self, data: &[u8]) -> Result<Vec<u8>> {
        Ok(data.to_vec())
    }

    fn compression_ratio(&self, original: usize, compressed: usize) -> f32 {
        compressed as f32 / original as f32
    }
}

pub struct MockCacheMonitor {
    hits: u64,
    misses: u64,
}

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

impl MockCacheMonitor {
    pub fn new() -> Self {
        Self { hits: 0, misses: 0 }
    }
}

#[async_trait]
impl CacheMonitor for MockCacheMonitor {
    async fn record_hit(&mut self, _key: &str, _latency: Duration) {
        self.hits += 1;
    }

    async fn record_miss(&mut self, _key: &str, _latency: Duration) {
        self.misses += 1;
    }

    async fn record_eviction(&mut self, _key: &str, _reason: EvictionReason) {
        // No-op
    }

    async fn get_statistics(&self) -> CacheStatistics {
        CacheStatistics {
            total_entries: 0,
            total_size_bytes: 0,
            hit_count: self.hits,
            miss_count: self.misses,
            eviction_count: 0,
            admission_count: 0,
            hit_rate: self.hits as f64 / (self.hits + self.misses) as f64,
            avg_latency_ns: 0,
            p50_latency_ns: 0,
            p95_latency_ns: 0,
            p99_latency_ns: 0,
            memory_usage_bytes: 0,
            cpu_usage_percent: 0.0,
            tier_stats: HashMap::new(),
        }
    }

    async fn get_alerts(&self) -> Vec<Alert> {
        vec![]
    }
}

pub struct MockCacheOptimizer;

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

impl MockCacheOptimizer {
    pub fn new() -> Self {
        Self
    }
}

#[async_trait]
impl CacheOptimizer for MockCacheOptimizer {
    async fn analyze_workload(&self, _operations: &[CacheOperation]) -> WorkloadPattern {
        WorkloadPattern {
            pattern_type: PatternType::Random,
            confidence: 0.8,
            parameters: HashMap::new(),
            detected_at: SystemTime::now(),
            sample_count: 100,
        }
    }

    async fn recommend_optimizations(
        &self,
        _stats: &CacheStatistics,
    ) -> Vec<OptimizationRecommendation> {
        vec![]
    }

    async fn auto_tune(&mut self, _config: &mut AdvancedCacheConfig) {
        // No-op
    }

    async fn detect_hot_keys(&self, _stats: &CacheStatistics) -> Vec<HotKey> {
        vec![]
    }
}