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<?php /** * WP AI Client: WP_AI_Client_Cache class * * @package WordPress * @subpackage AI * @since 7.0.0 */ use WordPress\AiClientDependencies\Psr\SimpleCache\CacheInterface; /** * WordPress-specific PSR-16 cache adapter for the AI Client. * * Bridges PSR-16 cache operations to WordPress object cache functions, * enabling the AI client to leverage WordPress caching infrastructure. * * @since 7.0.0 * @internal Intended only to wire up the PHP AI Client SDK to WordPress's caching system. * @access private */ class WP_AI_Client_Cache implements CacheInterface { /** * Cache group used for all cache operations. * * @since 7.0.0 * @var string */ private const CACHE_GROUP = 'wp_ai_client'; /** * Fetches a value from the cache. * * @since 7.0.0 * * @param string $key The unique key of this item in the cache. * @param mixed $default_value Default value to return if the key does not exist. * @return mixed The value of the item from the cache, or $default_value in case of cache miss. */ public function get( $key, $default_value = null ) { $found = false; $value = wp_cache_get( $key, self::CACHE_GROUP, false, $found ); if ( ! $found ) { return $default_value; } return $value; } /** * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time. * * @since 7.0.0 * * @param string $key The key of the item to store. * @param mixed $value The value of the item to store, must be serializable. * @param null|int|DateInterval $ttl Optional. The TTL value of this item. * @return bool True on success and false on failure. */ public function set( $key, $value, $ttl = null ): bool { $expire = $this->ttl_to_seconds( $ttl ); return wp_cache_set( $key, $value, self::CACHE_GROUP, $expire ); } /** * Delete an item from the cache by its unique key. * * @since 7.0.0 * * @param string $key The unique cache key of the item to delete. * @return bool True if the item was successfully removed. False if there was an error. */ public function delete( $key ): bool { return wp_cache_delete( $key, self::CACHE_GROUP ); } /** * Wipes clean the entire cache's keys. * * This method only clears the cache group used by this adapter. If the underlying * cache implementation does not support group flushing, this method returns false. * * @since 7.0.0 * * @return bool True on success and false on failure. */ public function clear(): bool { if ( ! function_exists( 'wp_cache_supports' ) || ! wp_cache_supports( 'flush_group' ) ) { return false; } return wp_cache_flush_group( self::CACHE_GROUP ); } /** * Obtains multiple cache items by their unique keys. * * @since 7.0.0 * * @param iterable<string> $keys A list of keys that can be obtained in a single operation. * @param mixed $default_value Default value to return for keys that do not exist. * @return array<string, mixed> A list of key => value pairs. */ public function getMultiple( $keys, $default_value = null ): array { /** * Keys array. * * @var array<string> $keys_array */ $keys_array = $this->iterable_to_array( $keys ); $values = wp_cache_get_multiple( $keys_array, self::CACHE_GROUP ); $result = array(); foreach ( $keys_array as $key ) { if ( false === $values[ $key ] ) { // Could be a stored false or a cache miss — disambiguate via get(). $result[ $key ] = $this->get( $key, $default_value ); } else { $result[ $key ] = $values[ $key ]; } } return $result; } /** * Persists a set of key => value pairs in the cache, with an optional TTL. * * @since 7.0.0 * * @param iterable<string, mixed> $values A list of key => value pairs for a multiple-set operation. * @param null|int|DateInterval $ttl Optional. The TTL value of this item. * @return bool True on success and false on failure. */ public function setMultiple( $values, $ttl = null ): bool { $values_array = $this->iterable_to_array( $values ); $expire = $this->ttl_to_seconds( $ttl ); $results = wp_cache_set_multiple( $values_array, self::CACHE_GROUP, $expire ); // Return true only if all operations succeeded. return ! in_array( false, $results, true ); } /** * Deletes multiple cache items in a single operation. * * @since 7.0.0 * * @param iterable<string> $keys A list of string-based keys to be deleted. * @return bool True if the items were successfully removed. False if there was an error. */ public function deleteMultiple( $keys ): bool { $keys_array = $this->iterable_to_array( $keys ); $results = wp_cache_delete_multiple( $keys_array, self::CACHE_GROUP ); // Return true only if all operations succeeded. return ! in_array( false, $results, true ); } /** * Determines whether an item is present in the cache. * * @since 7.0.0 * * @param string $key The cache item key. * @return bool True if the item exists in the cache, false otherwise. */ public function has( $key ): bool { $found = false; wp_cache_get( $key, self::CACHE_GROUP, false, $found ); return (bool) $found; } /** * Converts a PSR-16 TTL value to seconds for WordPress cache functions. * * @since 7.0.0 * * @param null|int|DateInterval $ttl The TTL value. * @return int The TTL in seconds, or 0 for no expiration. */ private function ttl_to_seconds( $ttl ): int { if ( null === $ttl ) { return 0; } if ( $ttl instanceof DateInterval ) { $now = new DateTime(); $end = ( clone $now )->add( $ttl ); return $end->getTimestamp() - $now->getTimestamp(); } return max( 0, (int) $ttl ); } /** * Converts an iterable to an array. * * @since 7.0.0 * * @param iterable<mixed> $items The iterable to convert. * @return array<mixed> The array. */ private function iterable_to_array( $items ): array { if ( is_array( $items ) ) { return $items; } return iterator_to_array( $items ); } }
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