Trait CachePolicy 

pub trait CachePolicy<K>: Send + Sync
where
    K: Eq + Hash + Clone + Send + Sync + 'static,
{
    // Required methods
    fn kind(&self) -> CachePolicyKind;
    fn admit(&self, key: &K, weight_bytes: u64) -> CacheAdmission;
    fn record_hit(&self, key: &K) -> bool;
    fn invalidate(&self, key: &K);
    fn drain_evictions(&self) -> Vec<CachePolicyEviction<K>>;
    fn reset(&self);
    fn stats(&self) -> CachePolicyMetrics;
}

Policy abstraction consumed by caches.

Required Methods

fn kind(&self) -> CachePolicyKind

Policy kind (for telemetry + configuration reflection).

fn admit(&self, key: &K, weight_bytes: u64) -> CacheAdmission

Decide whether an entry should be admitted.

fn record_hit(&self, key: &K) -> bool

Record a cache hit (returns whether the hit was served from the protected set).

fn invalidate(&self, key: &K)

Remove policy metadata for a key (called when entries are explicitly cleared).

fn drain_evictions(&self) -> Vec<CachePolicyEviction<K>>

Drain pending eviction events generated by the policy implementation.

fn reset(&self)

Reset policy state (used when wiping the cache).

fn stats(&self) -> CachePolicyMetrics

Snapshot policy metrics.

Implementors