Struct TieredCacheConfig 

pub struct TieredCacheConfig {
    pub enable_l1: bool,
    pub enable_l2: bool,
    pub write_through: bool,
    pub promote_to_l1: bool,
    pub l1_ttl_fraction: f64,
    pub l1_promote_ttl: Option<Duration>,
}

Tiered cache configuration

Fields

enable_l1: bool

Enable L1 cache

enable_l2: bool

Enable L2 cache

write_through: bool

Write-through to L2 on L1 set

promote_to_l1: bool

Promote L2 hits to L1

l1_ttl_fraction: f64

L1 TTL multiplier (fraction of L2 TTL)

l1_promote_ttl: Option<Duration>

Fixed TTL applied to entries promoted from L2 into L1 on a read hit.

Policy

Deriving the promoted L1 TTL from the live remaining L2 TTL would require an extra TTL round-trip to L2 on every promotion (the hot read path). To avoid that per-read cost we instead apply this fixed default. None means promoted entries are stored without expiry and rely on L1 capacity/eviction. Defaults to 60s.

Note: the write path (set) still derives the L1 TTL as l1_ttl_fraction * ttl because the TTL is already known there without any extra round-trip.

Trait Implementations

impl Clone for TieredCacheConfig

fn clone(&self) -> TieredCacheConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TieredCacheConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TieredCacheConfig

fn default() -> Self

Returns the “default value” for a type.