<?php

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/**

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* WC Queue

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*

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* @version 3.5.0

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* @package WooCommerce\Interface

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*/

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if ( ! defined( 'ABSPATH' ) ) {

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exit; // Exit if accessed directly.

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}

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/**

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* WC Queue

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*

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* Singleton for managing the WC queue instance.

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*

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* @version 3.5.0

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*/

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class WC_Queue {

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/**

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* The single instance of the queue.

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*

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* @var WC_Queue_Interface|null

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*/

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protected static $instance = null;

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/**

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* The default queue class to initialize

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*

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* @var string

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*/

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protected static $default_cass = 'WC_Action_Queue';

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/**

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* Single instance of WC_Queue_Interface

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*

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* @return WC_Queue_Interface

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*/

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final public static function instance() {

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if ( is_null( self::$instance ) ) {

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$class = self::get_class();

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self::$instance = new $class();

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self::$instance = self::validate_instance( self::$instance );

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}

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return self::$instance;

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}

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/**

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* Get class to instantiate

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*

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* And make sure 3rd party code has the chance to attach a custom queue class.

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*

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* @return string

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*/

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protected static function get_class() {

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if ( ! did_action( 'plugins_loaded' ) ) {

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wc_doing_it_wrong( __FUNCTION__, __( 'This function should not be called before plugins_loaded.', 'woocommerce' ), '3.5.0' );

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}

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return apply_filters( 'woocommerce_queue_class', self::$default_cass );

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}

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/**

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* Enforce a WC_Queue_Interface

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*

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* @param WC_Queue_Interface $instance Instance class.

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* @return WC_Queue_Interface

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*/

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protected static function validate_instance( $instance ) {

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if ( false === ( $instance instanceof WC_Queue_Interface ) ) {

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$default_class = self::$default_cass;

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/* translators: %s: Default class name */

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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' );

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$instance = new $default_class();

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}

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return $instance;

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}

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}

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