Struct TTLConfig 

pub struct TTLConfig {
    pub base_ttl: Duration,
    pub min_ttl: Duration,
    pub max_ttl: Duration,
    pub hot_threshold: u64,
    pub cold_threshold: u64,
    pub adaptation_rate: f64,
    pub enable_background_cleanup: bool,
    pub cleanup_interval: Duration,
    pub max_entries: usize,
    pub memory_pressure_threshold: f64,
    pub enable_adaptive_ttl: bool,
    pub access_window_secs: u64,
}

Configuration for adaptive TTL cache

Fields

base_ttl: Duration

Base TTL for new entries

min_ttl: Duration

Minimum TTL (entries won’t be reduced below this)

max_ttl: Duration

Maximum TTL (entries won’t be extended beyond this)

hot_threshold: u64

Hot threshold - access count above which TTL is extended

cold_threshold: u64

Cold threshold - access count below which TTL is reduced

adaptation_rate: f64

Adaptation rate - how fast TTL changes (0.0 - 1.0)

enable_background_cleanup: bool

Enable background cleanup task

cleanup_interval: Duration

Cleanup interval for expired entries

max_entries: usize

Maximum number of entries in cache

memory_pressure_threshold: f64

Memory pressure threshold (0.0 - 1.0)

enable_adaptive_ttl: bool

Enable adaptive TTL based on access patterns

access_window_secs: u64

Time window for access pattern analysis (seconds)

Implementations

impl TTLConfig

pub fn new() -> Self

Create a new TTLConfig with default values

pub fn high_hit_rate() -> Self

Create a configuration optimized for high-hit-rate scenarios

pub fn memory_constrained() -> Self

Create a configuration optimized for memory-constrained environments

pub fn write_heavy() -> Self

Create a configuration optimized for write-heavy workloads

pub fn validate(&self) -> Result<(), TTLConfigError>

Validate the configuration

pub fn calculate_ttl( &self, current_ttl: Duration, access_count: u64, ) -> Duration

Calculate adapted TTL based on access count

pub fn with_base_ttl(self, ttl: Duration) -> Self

Builder method to set base TTL

pub fn with_min_ttl(self, ttl: Duration) -> Self

Builder method to set min TTL

pub fn with_max_ttl(self, ttl: Duration) -> Self

Builder method to set max TTL

pub fn with_hot_threshold(self, threshold: u64) -> Self

Builder method to set hot threshold

pub fn with_cold_threshold(self, threshold: u64) -> Self

Builder method to set cold threshold

pub fn with_adaptation_rate(self, rate: f64) -> Self

Builder method to set adaptation rate

pub fn with_max_entries(self, max: usize) -> Self

Builder method to set max entries

Trait Implementations

impl Clone for TTLConfig

fn clone(&self) -> TTLConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TTLConfig

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

Formats the value using the given formatter.

impl Default for TTLConfig

fn default() -> Self

Returns the “default value” for a type.