Struct AccessPattern 

pub struct AccessPattern {
    pub key: String,
    pub access_times: Vec<u64>,
    pub size_bytes: usize,
}

Historical access record for a single cache key.

Fields

key: String

The cache key this record belongs to.

access_times: Vec<u64>

Monotonically increasing Unix timestamps (seconds) of past accesses.

size_bytes: usize

Caller-supplied estimated byte size for this key’s value.

Implementations

impl AccessPattern

pub fn frequency_per_hour(&self) -> f64

Compute accesses per hour over the entire recorded history.

Returns 0.0 when fewer than two access timestamps are known (the time-span is undefined).

pub fn predict_next_access(&self) -> Option<u64>

Predict the next access timestamp using exponential inter-arrival smoothing (EMA with α = 0.3 on inter-arrival deltas).

Returns None when there are fewer than two data points.

pub fn periodicity_secs(&self) -> Option<f64>

Attempt to detect a dominant periodic inter-arrival time (in seconds) using normalised auto-correlation of the inter-arrival sequence.

Returns Some(period) when the highest off-zero auto-correlation peak exceeds 0.3 (weak threshold to be liberal about detection). Returns None when the sequence is too short or no clear periodicity is found.

Trait Implementations

impl Clone for AccessPattern

fn clone(&self) -> AccessPattern

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AccessPattern

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

Formats the value using the given formatter.