Struct SlruMeta 

pub struct SlruMeta {
    pub segment: SlruSegment,
}

Metadata for SLRU (Segmented LRU) cache entries.

SLRU uses two segments to provide scan resistance:

• New items enter the probationary segment
• Accessed items in probationary are promoted to protected
• When protected is full, LRU items demote back to probationary

Examples

use cache_rs::meta::{SlruMeta, SlruSegment};

// New entry starts in probationary
let meta = SlruMeta::default();
assert_eq!(meta.segment, SlruSegment::Probationary);

// After promotion
let protected_meta = SlruMeta::new(SlruSegment::Protected);
assert_eq!(protected_meta.segment, SlruSegment::Protected);

Fields

segment: SlruSegment

Which segment this entry is currently in.

Implementations

impl SlruMeta

pub fn new(segment: SlruSegment) -> Self

Creates a new SLRU metadata with the specified segment.

Arguments

• segment - The segment where this entry should be placed

pub fn probationary() -> Self

Creates metadata for a probationary segment entry.

pub fn protected() -> Self

Creates metadata for a protected segment entry.

pub fn is_probationary(&self) -> bool

Returns true if the entry is in the probationary segment.

pub fn is_protected(&self) -> bool

Returns true if the entry is in the protected segment.

pub fn promote(&mut self)

Promotes the entry to the protected segment.

pub fn demote(&mut self)

Demotes the entry to the probationary segment.

Trait Implementations

impl Clone for SlruMeta

fn clone(&self) -> SlruMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SlruMeta

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

Formats the value using the given formatter.

impl Default for SlruMeta

fn default() -> SlruMeta

Returns the “default value” for a type.

impl PartialEq for SlruMeta

fn eq(&self, other: &SlruMeta) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SlruMeta

impl Eq for SlruMeta

impl StructuralPartialEq for SlruMeta