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/**
* Lock configuration class, used to get an instance of the currently configured lock factory.
*
* @package core
* @category lock
* @copyright Damyon Wiese 2013
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core\lock;
defined('MOODLE_INTERNAL') || die();
/**
* Lock configuration class, used to get an instance of the currently configured lock factory.
*
* @package core
* @category lock
* @copyright Damyon Wiese 2013
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class lock_config {
/**
* Get the currently configured locking subclass.
*
* @return string class name
* @throws \coding_exception
*/
public static function get_lock_factory_class(): string {
global $CFG, $DB;
if (during_initial_install()) {
$lockfactoryclass = '\core\lock\installation_lock_factory';
} else if (isset($CFG->lock_factory) && $CFG->lock_factory != 'auto') {
if (!class_exists($CFG->lock_factory)) {
// In this case I guess it is not safe to continue. Different cluster nodes could end up using different locking
// types because of an installation error.
throw new \coding_exception('Lock factory set in $CFG does not exist: ' . $CFG->lock_factory);
}
$lockfactoryclass = $CFG->lock_factory;
} else {
$dbtype = clean_param($DB->get_dbfamily(), PARAM_ALPHA);
// DB Specific lock factory is preferred - should support auto-release.
$lockfactoryclass = "\\core\\lock\\${dbtype}_lock_factory";
if (!class_exists($lockfactoryclass)) {
$lockfactoryclass = '\core\lock\file_lock_factory';
}
// Test if the auto chosen lock factory is available.
$lockfactory = new $lockfactoryclass('test');
if (!$lockfactory->is_available()) {
// Final fallback - DB row locking.
$lockfactoryclass = '\core\lock\db_record_lock_factory';
}
}
return $lockfactoryclass;
}
/**
* Get an instance of the currently configured locking subclass.
*
* @param string $type - Unique namespace for the locks generated by this factory. e.g. core_cron
* @return \core\lock\lock_factory
* @throws \coding_exception
*/
public static function get_lock_factory(string $type): \core\lock\lock_factory {
global $CFG;
$lockfactoryclass = self::get_lock_factory_class();
$lockfactory = new $lockfactoryclass($type);
if (!$lockfactory->is_available()) {
throw new \coding_exception("Lock factory class $lockfactoryclass is not available.");
}
// If tracking performance, insert a timing wrapper to keep track of lock delays.
if (defined('MDL_PERF') || !empty($CFG->perfdebug)) {
$wrapper = new timing_wrapper_lock_factory($type, $lockfactory);
$lockfactory = $wrapper;
}
return $lockfactory;
}
}