signalk-parquet/dist/utils/lru-cache.d.ts

Vessel data Parquet file archive with automated value and geospatial triggers. History API compliant with cloud backups and queries.

/**
 * Least Recently Used (LRU) cache with size limit
 * Automatically evicts oldest entries when size limit is reached
 *
 * This prevents memory leaks from unbounded Map growth while maintaining
 * a Map-compatible interface for easy drop-in replacement.
 *
 * @example
 * ```typescript
 * const cache = new LRUCache<string, number[]>(1000);
 * cache.set('key1', [1, 2, 3]);
 * const value = cache.get('key1'); // [1, 2, 3]
 * ```
 */
export declare class LRUCache<K, V> {
    private cache;
    private maxSize;
    constructor(maxSize?: number);
    /**
     * Set a value in the cache
     * Automatically evicts oldest entry if size limit is reached
     */
    set(key: K, value: V): void;
    /**
     * Get a value from cache
     * Moves accessed entry to end (marks as recently used)
     */
    get(key: K): V | undefined;
    /**
     * Check if key exists
     */
    has(key: K): boolean;
    /**
     * Delete an entry
     */
    delete(key: K): boolean;
    /**
     * Clear all entries
     */
    clear(): void;
    /**
     * Get current size
     */
    get size(): number;
    /**
     * Iterate over entries (oldest to newest)
     */
    forEach(callback: (value: V, key: K) => void): void;
    /**
     * Get all keys
     */
    keys(): K[];
    /**
     * Get all values
     */
    values(): V[];
    /**
     * Get cache statistics
     */
    getStats(): {
        size: number;
        maxSize: number;
        utilizationPercent: number;
    };
}
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