Struct NegativeCacheConfig 

pub struct NegativeCacheConfig {
    pub max_entries: usize,
    pub timeout: Duration,
    pub adaptive_ttl: Option<AdaptiveTtlConfig>,
}

Configuration for the negative cache.

Negative caching stores “file not found” results to avoid repeated filesystem lookups for non-existent files. This is particularly effective for directories like node_modules and .git where many lookups fail.

Fields

max_entries: usize

Maximum number of entries in the cache. When exceeded, expired entries are evicted. Default: 10000

timeout: Duration

Time-to-live for cache entries. Entries older than this are considered stale. Default: 5 seconds

adaptive_ttl: Option<AdaptiveTtlConfig>

Adaptive TTL configuration for path-pattern-based timeouts. When set, insert_with_path uses per-path TTLs instead of the global timeout value.

Implementations

impl NegativeCacheConfig

pub fn new() -> Self

Creates a new configuration with default values.

pub const fn fixed(timeout: Duration, max_entries: usize) -> Self

Creates a configuration with no adaptive TTL (fixed timeout only).

Trait Implementations

impl Clone for NegativeCacheConfig

fn clone(&self) -> NegativeCacheConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NegativeCacheConfig

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

Formats the value using the given formatter.

impl Default for NegativeCacheConfig

fn default() -> Self

Returns the “default value” for a type.