/**
 * Abstract interface class for an application cache object.
 */
export default abstract class Cache {
    /**
     * Fetch a value from the cache by its key.
     * @param {string} key
     * @return Promise<any|undefined>
     */
    public abstract async fetch(key: string): Promise<any>;

    /**
     * Store the given value in the cache by key.
     * @param {string} key
     * @param {string} value
     */
    public abstract async put(key: string, value: string): Promise<void>;

    /**
     * Check if the cache has the given key.
     * @param {string} key
     * @return Promise<boolean>
     */
    public abstract async has(key: string): Promise<boolean>;

    /**
     * Drop the given key from the cache.
     * @param {string} key
     */
    public abstract async drop(key: string): Promise<void>;
}