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<?php |
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|
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/** |
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* Class Optml_Attachment_Cache. |
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*/ |
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class Optml_Attachment_Cache { |
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const CACHE_GROUP = 'om_att'; |
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/** |
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* Local cache map. |
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* |
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* @var array |
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*/ |
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private static $cache_map = []; |
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/** |
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* Reset the memory cache. |
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*/ |
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public static function reset() { |
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self::$cache_map = []; |
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} |
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/** |
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* Get the cached attachment ID. |
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* |
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* @param string $url the URL of the attachment. |
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* |
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* @return bool|mixed |
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*/ |
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public static function get_cached_attachment_id( $url ) { |
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|
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// We cache also in memory to avoid calling DB every time when not using Object Cache. |
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$cache_key = self::get_cache_key( $url ); |
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if ( isset( self::$cache_map[ $cache_key ] ) ) { |
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return self::$cache_map[ $cache_key ]; |
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} |
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|
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$value = wp_using_ext_object_cache() |
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? wp_cache_get( $cache_key, self::CACHE_GROUP ) |
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: get_transient( self::CACHE_GROUP . $cache_key ); |
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self::$cache_map[ $cache_key ] = $value; |
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|
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return $value; |
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} |
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|
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/** |
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* Set the cached attachment ID. |
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* |
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* @param string $url the URL of the attachment. |
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* @param int $id the attachment ID. |
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* |
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* @return void |
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*/ |
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public static function set_cached_attachment_id( $url, $id ) { |
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$cache_key = self::get_cache_key( $url ); |
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// We cache also in memory to avoid calling DB every time when not using Object Cache. |
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self::$cache_map[ $cache_key ] = $id; |
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// If the ID is not found we cache for 10 minutes, otherwise for a week. |
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// We try to reduce the cache time when is not found to |
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// avoid caching for situation when this might be temporary. |
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$expiration = $id === 0 ? ( 10 * MINUTE_IN_SECONDS ) : WEEK_IN_SECONDS; |
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wp_using_ext_object_cache() |
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? wp_cache_set( $cache_key, $id, self::CACHE_GROUP, $expiration ) |
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: set_transient( self::CACHE_GROUP . $cache_key, $id, $expiration ); |
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} |
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|
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/** |
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* Generate cache key for URL. |
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* |
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* @param string $url the URL to generate the cache key for. |
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* |
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* @return string |
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*/ |
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private static function get_cache_key( $url ) { |
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$url = strtok( $url, '?' ); |
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|
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return 'id_' . crc32( $url ); |
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} |
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} |
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