Struct MemoryBackend 

pub struct MemoryBackend { /* private fields */ }

Implementations

impl MemoryBackend

pub fn new() -> MemoryBackend

Trait Implementations

impl Default for MemoryBackend

fn default() -> MemoryBackend

Returns the “default value” for a type.

impl RangeCacheBackend for MemoryBackend

fn get<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, _expected_len: u64, ) -> Pin<Box<dyn Future<Output = Option<Bytes>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, MemoryBackend: 'async_trait,

expected_len is the exact length the caller will accept for key. A backend MUST NOT copy a value whose length differs into any faster tier it maintains (the promotion gate) and MUST treat such a value as a miss. Single-tier backends accept and ignore the parameter.

fn put<'life0, 'async_trait>( &'life0 self, key: String, value: Bytes, _hint: FillHint, ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>

where 'life0: 'async_trait, MemoryBackend: 'async_trait,

value is an owned buffer, not a view into a larger one (e.g. a slice of a coalesced multi-block origin GET): range_cache::fetch copies each block once before calling put, specifically so no cached (or in-flight-write) value pins a larger parent allocation alive. A backend may therefore store value as-is; it must not assume it needs its own defensive copy to detach from a parent buffer.

fn disk_stats(&self) -> Option<BackendDiskStats>

Disk write-path counters, for the saturation monitor’s per-second gauges. Defaulted to None so backends without a disk tier (e.g. MemoryBackend) need no override.

fn ram_usage_bytes(&self) -> Option<usize>

Accounted RAM-tier byte usage, for the saturation monitor’s residency gauge. None for backends with no RAM tier accounting (e.g. MemoryBackend). Divergence between this and process RSS is the signature of a cached value pinning more than its accounted weight.

fn ram_entries(&self) -> Option<usize>

Accounted RAM-tier entry count, the entry-count sibling to ram_usage_bytes. None for backends with no RAM tier accounting (e.g. MemoryBackend).