Struct QueryCache 

pub struct QueryCache { /* private fields */ }

LRU cache for parsed VelesQL queries.

Thread-safe implementation using parking_lot::RwLock.

Example

use velesdb_core::velesql::QueryCache;

let cache = QueryCache::new(1000);
let query = cache.parse("SELECT * FROM documents LIMIT 10")?;
// Second call returns cached AST
let query2 = cache.parse("SELECT * FROM documents LIMIT 10")?;
assert!(cache.stats().hits >= 1);

Implementations

impl QueryCache

pub fn new(max_size: usize) -> Self

Creates a new query cache with the specified maximum size.

Arguments

• max_size - Maximum number of queries to cache (minimum 1)

pub fn parse(&self, query: &str) -> Result<Query, ParseError>

Parses a query, returning cached AST if available.

Errors

Returns ParseError if the query is invalid.

pub fn stats(&self) -> CacheStats

Returns current cache statistics.

pub fn len(&self) -> usize

Returns the current number of cached queries.

pub fn is_empty(&self) -> bool

Returns true if the cache is empty.

pub fn clear(&self)

Clears all cached queries and resets statistics.

Trait Implementations

impl Default for QueryCache

fn default() -> Self

Returns the “default value” for a type.