/** @module cache */
/**
 * Interface for caches that are used to cache values to improve performance.
 */
export interface ICache {
    /**
     * Retrieves cached value from the cache using its key.
     * If value is missing in the cache or expired it returns null.
     *
     * @param correlationId     (optional) transaction id to trace execution through call chain.
     * @param key               a unique value key.
     * @param callback          callback function that receives cached value or error.
     */
    retrieve(correlationId: string, key: string, callback: (err: any, value: any) => void): void;
    /**
     * Stores value in the cache with expiration time.
     *
     * @param correlationId     (optional) transaction id to trace execution through call chain.
     * @param key               a unique value key.
     * @param value             a value to store.
     * @param timeout           expiration timeout in milliseconds.
     * @param callback          (optional) callback function that receives an error or null for success
     */
    store(correlationId: string, key: string, value: any, timeout: number, callback?: (err: any) => void): void;
    /**
     * Removes a value from the cache by its key.
     *
     * @param correlationId     (optional) transaction id to trace execution through call chain.
     * @param key               a unique value key.
     * @param callback          (optional) callback function that receives an error or null for success
     */
    remove(correlationId: string, key: string, callback?: (err: any) => void): any;
}