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<?php namespace Automattic\WooCommerce\Caching; /** * Interface for cache engines used by objects inheriting from ObjectCache. * Here "object" means either an array or an actual PHP object. */ interface CacheEngine { /** * Retrieves an object cached under a given key. * * @param string $key They key under which the object to retrieve is cached. * @param string $group The group under which the object is cached. * * @return array|object|null The cached object, or null if there's no object cached under the passed key. */ public function get_cached_object( string $key, string $group = '' ); /** * Caches an object under a given key, and with a given expiration. * * @param string $key The key under which the object will be cached. * @param array|object $object The object to cache. * @param int $expiration Expiration for the cached object, in seconds. * @param string $group The group under which the object will be cached. * * @return bool True if the object is cached successfully, false otherwise. */ public function cache_object( string $key, $object, int $expiration, string $group = '' ): bool; /** * Removes a cached object from the cache. * * @param string $key They key under which the object is cached. * @param string $group The group under which the object is cached. * * @return bool True if the object is removed from the cache successfully, false otherwise (because the object wasn't cached or for other reason). */ public function delete_cached_object( string $key, string $group = '' ): bool; /** * Checks if an object is cached under a given key. * * @param string $key The key to verify. * @param string $group The group under which the object is cached. * * @return bool True if there's an object cached under the given key, false otherwise. */ public function is_cached( string $key, string $group = '' ): bool; /** * Deletes all cached objects under a given group. * * @param string $group The group to delete. * * @return bool True if the group is deleted successfully, false otherwise. */ public function delete_cache_group( string $group = '' ): bool; }