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<?php /** * WC Queue * * @version 3.5.0 * @package WooCommerce\Interface / if ( ! defined( 'ABSPATH' ) ) { exit; // Exit if accessed directly. } /* * WC Queue * * Singleton for managing the WC queue instance. * * @version 3.5.0 / class WC_Queue { /* * The single instance of the queue. * * @var WC_Queue_Interface\|null / protected static $instance = null; /* * The default queue class to initialize * * @var string / protected static $default_cass = 'WC_Action_Queue'; /* * Single instance of WC_Queue_Interface * * @return WC_Queue_Interface / final public static function instance() { if ( is_null( self::$instance ) ) { $class = self::get_class(); self::$instance = new $class(); self::$instance = self::validate_instance( self::$instance ); } return self::$instance; } /* * Get class to instantiate * * And make sure 3rd party code has the chance to attach a custom queue class. * * @return string / protected static function get_class() { if ( ! did_action( 'plugins_loaded' ) ) { wc_doing_it_wrong( __FUNCTION__, __( 'This function should not be called before plugins_loaded.', 'woocommerce' ), '3.5.0' ); } return apply_filters( 'woocommerce_queue_class', self::$default_cass ); } /* * Enforce a WC_Queue_Interface * * @param WC_Queue_Interface $instance Instance class. * @return WC_Queue_Interface / protected static function validate_instance( $instance ) { if ( false === ( $instance instanceof WC_Queue_Interface ) ) { $default_class = self::$default_cass; / translators: %s: Default class name */ wc_doing_it_wrong( __FUNCTION__, sprintf( __( 'The class attached to the "woocommerce_queue_class" does not implement the WC_Queue_Interface interface. The default %s class will be used instead.', 'woocommerce' ), $default_class ), '3.5.0' ); $instance = new $default_class(); } return $instance; } }