Struct QueryCache 

pub struct QueryCache { /* private fields */ }

Query result cache with LRU eviction

Implementations

impl QueryCache

pub fn new(config: QueryCacheConfig) -> Self

Create a new query cache

pub fn get(&self, pattern: &QueryPattern) -> Option<Vec<(Term, Term, Term)>>

Get cached results for a query pattern

pub fn put( &self, pattern: QueryPattern, results: Vec<(Term, Term, Term)>, ) -> Result<()>

Store results in cache

pub fn invalidate_all(&self)

Invalidate all cached results

This should be called when the underlying data changes (inserts, deletes, updates)

pub fn invalidate_pattern( &self, subject: Option<&str>, predicate: Option<&str>, object: Option<&str>, )

Invalidate cache entries matching a pattern

This is more selective than invalidate_all() - only invalidates entries that might be affected by changes to a specific triple pattern.

pub fn stats(&self) -> &QueryCacheStats

Get cache statistics

pub fn max_entries(&self) -> usize

Maximum number of cached query results this cache retains before evicting (the configured capacity, e.g. from StoreParams::query_cache_size).

pub fn clear(&self)

Clear all cache entries and reset statistics

pub fn len(&self) -> usize

Get current cache size

pub fn is_empty(&self) -> bool

Check if cache is empty