Enum CacheHint 

pub enum CacheHint {
    Always,
    UntilChanged,
    SlidingPrefix {
        stable_fraction: f32,
    },
    Never,
}

Cache hint for a region or message boundary.

Variants

Always

Always cache - content never changes (pinned, system, tools, compact history).

UntilChanged

Cache until content hash changes (compacting regions between compaction events).

SlidingPrefix

Cache the stable prefix of a sliding window. stable_fraction is 0.0..1.0 (default 0.75 = oldest 75% of messages are stable).

Fields

stable_fraction: f32

Never

Never cache (temporary, clearable, new messages).

Trait Implementations

impl Clone for CacheHint

fn clone(&self) -> CacheHint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CacheHint

impl Debug for CacheHint

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CacheHint

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for CacheHint

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for CacheHint

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for CacheHint