cachekit 0.1.0-alpha

High-performance, policy-driven cache primitives for Rust systems (FIFO/LRU/ARC) with optional metrics.
Documentation 
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#[derive(Debug, Default, Clone, Copy)]
pub struct CacheMetricsSnapshot {
    pub get_calls: u64,
    pub get_hits: u64,
    pub get_misses: u64,

    pub insert_calls: u64,
    pub insert_updates: u64,
    pub insert_new: u64,

    pub evict_calls: u64,
    pub evicted_entries: u64,
    pub stale_skips: u64, // queue entries popped that were already removed from map
    pub evict_scan_steps: u64, // how many pop_front iterations inside eviction

    pub pop_oldest_calls: u64,
    pub pop_oldest_found: u64,
    pub pop_oldest_empty_or_stale: u64,

    pub peek_oldest_calls: u64,
    pub peek_oldest_found: u64,

    pub age_rank_calls: u64,
    pub age_rank_found: u64,
    pub age_rank_scan_steps: u64,

    // gauges captured at snapshot time
    pub cache_len: usize,
    pub insertion_order_len: usize,
    pub capacity: usize,
}

#[derive(Debug, Default, Clone, Copy)]
pub struct LruMetricsSnapshot {
    pub get_calls: u64,
    pub get_hits: u64,
    pub get_misses: u64,

    pub insert_calls: u64,
    pub insert_updates: u64,
    pub insert_new: u64,

    pub evict_calls: u64,
    pub evicted_entries: u64,

    pub pop_lru_calls: u64,
    pub pop_lru_found: u64,
    pub peek_lru_calls: u64,
    pub peek_lru_found: u64,
    pub touch_calls: u64,
    pub touch_found: u64,
    pub recency_rank_calls: u64,
    pub recency_rank_found: u64,
    pub recency_rank_scan_steps: u64,

    pub cache_len: usize,
    pub capacity: usize,
}

#[derive(Debug, Default, Clone, Copy)]
pub struct LfuMetricsSnapshot {
    pub get_calls: u64,
    pub get_hits: u64,
    pub get_misses: u64,

    pub insert_calls: u64,
    pub insert_updates: u64,
    pub insert_new: u64,

    pub evict_calls: u64,
    pub evicted_entries: u64,

    pub pop_lfu_calls: u64,
    pub pop_lfu_found: u64,
    pub peek_lfu_calls: u64,
    pub peek_lfu_found: u64,
    pub frequency_calls: u64,
    pub frequency_found: u64,
    pub reset_frequency_calls: u64,
    pub reset_frequency_found: u64,
    pub increment_frequency_calls: u64,
    pub increment_frequency_found: u64,

    pub cache_len: usize,
    pub capacity: usize,
}

#[derive(Debug, Default, Clone, Copy)]
pub struct LruKMetricsSnapshot {
    pub get_calls: u64,
    pub get_hits: u64,
    pub get_misses: u64,

    pub insert_calls: u64,
    pub insert_updates: u64,
    pub insert_new: u64,

    pub evict_calls: u64,
    pub evicted_entries: u64,

    pub pop_lru_calls: u64,
    pub pop_lru_found: u64,
    pub peek_lru_calls: u64,
    pub peek_lru_found: u64,
    pub touch_calls: u64,
    pub touch_found: u64,
    pub recency_rank_calls: u64,
    pub recency_rank_found: u64,
    pub recency_rank_scan_steps: u64,

    pub pop_lru_k_calls: u64,
    pub pop_lru_k_found: u64,
    pub peek_lru_k_calls: u64,
    pub peek_lru_k_found: u64,
    pub k_distance_calls: u64,
    pub k_distance_found: u64,
    pub k_distance_rank_calls: u64,
    pub k_distance_rank_found: u64,
    pub k_distance_rank_scan_steps: u64,

    pub cache_len: usize,
    pub capacity: usize,
}