Struct Pack 

pub struct Pack<M: Medium> { /* private fields */ }

Records [magic u32][len u32][key 16B][checksum u64][entry], appended and never rewritten in place except by a sweep. Only samples are kept, as on disk. Opening reads every record, the later of two under one key winning, and cuts the medium at the first that does not check out: a torn tail is a miss, never a misread.

Implementations

impl<M: Medium> Pack<M>

pub fn open(medium: M, max_bytes: u64) -> Pack<M>

pub fn coded(self, codec: Box<dyn SampleCodec>) -> Pack<M>

pub fn medium(&self) -> &M

Trait Implementations

impl<M: Medium> Cache for Pack<M>

fn held_bytes(&self) -> u64

The medium’s whole length, records a later one replaced included, until a sweep.

fn worth_storing( &self, _cost: Duration, _bytes: usize, kind: PayloadKind, ) -> bool

No clock enters it: a value a browser renders has no measured cost to weigh.

fn max_bytes(&self) -> u64

fn evicted_bytes(&self) -> u64

fn faults(&self) -> u64

fn holds(&self, key: Hash) -> bool

fn load(&self, key: Hash, node: &str, expected: Expected) -> Option<Entry>

fn peek(&self, key: Hash, node: &str, expected: Expected) -> Option<Entry>

load with no side effect: no recency, promotion, fault or removal.

fn store( &self, key: Hash, payload: &Payload, traces: &[FilterTrace], label: Option<&Label>, )

fn sweep(&self)

fn dir(&self) -> Option<&Path>