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declare(strict_types=1);
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declare(strict_types=1);
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namespace mod_quiz\cache;
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namespace mod_quiz\cache;
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use core_cache\data_source_interface;
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use cache_definition;
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use core_cache\definition;
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/**
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/**
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 * Class quiz_overrides
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 * Class quiz_overrides
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 *
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 *
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 * @package   mod_quiz
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 * @package   mod_quiz
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 * @copyright 2021 Shamim Rezaie <shamim@moodle.com>
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @copyright 2021 Shamim Rezaie <shamim@moodle.com>
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 */
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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class overrides implements \cache_data_source {
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 */
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class overrides implements data_source_interface {
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    /** @var overrides the singleton instance of this class. */
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    /** @var overrides the singleton instance of this class. */
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    protected static $instance = null;
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    protected static $instance = null;
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    /**
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    /**
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     * Returns an instance of the data source class that the cache can use for loading data using the other methods
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     * Returns an instance of the data source class that the cache can use for loading data using the other methods
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     * specified by this interface.
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     * specified by this interface.
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     *
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     *
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     * @param cache_definition $definition
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     * @param definition $definition
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     * @return stdClass
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     * @return overrides
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     */
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     */
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    public static function get_instance_for_cache(cache_definition $definition): overrides {
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    public static function get_instance_for_cache(definition $definition): overrides {
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     * @throws \coding_exception
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     * @throws \coding_exception
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     */
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     */
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    public function load_for_cache($key) {
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    public function load_for_cache($key) {
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        global $DB;
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        global $DB;
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        // Ignore getting data if this is a cache invalidation - {@see \cache_helper::purge_by_event()}.
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        // Ignore getting data if this is a cache invalidation - {@see \core_cache\helper::purge_by_event()}.
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        if ($key == 'lastinvalidation') {
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        if ($key == 'lastinvalidation') {
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            return null;
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            return null;
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        }
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        }