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//
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//
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// You should have received a copy of the GNU General Public License
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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declare(strict_types=1);
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declare(strict_types=1);
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namespace mod_scorm\cache;
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namespace mod_scorm\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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 * Cache data source for the scorm elements.
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 * Cache data source for the scorm elements.
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 *
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 *
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 * @package   mod_scorm
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 * @package   mod_scorm
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 * @copyright 2023 Catalyst IT Ltd
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 * @copyright 2023 Catalyst IT Ltd
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 * @author    Dan Marsden <dan@danmarsden.com>
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 * @author    Dan Marsden <dan@danmarsden.com>
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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 */
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class elements implements \cache_data_source {
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class elements implements data_source_interface {
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    /** @var elements the singleton instance of this class. */
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    /** @var elements 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 object
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     * @return object
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     */
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     */
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    public static function get_instance_for_cache(cache_definition $definition): elements {
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    public static function get_instance_for_cache(definition $definition): elements {
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        if (is_null(self::$instance)) {
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        if (is_null(self::$instance)) {