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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;
}