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. /** * Delegated database transaction support. * * @package core_dml * @copyright 2009 Petr Skoda (http://skodak.org) * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); /** * Delegated transaction class. * * @package core_dml * @copyright 2009 Petr Skoda (http://skodak.org) * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class moodle_transaction { /** @var array The debug_backtrace() returned array.*/ private $start_backtrace; /**@var moodle_database The moodle_database instance.*/ private $database = null; /** * Delegated transaction constructor, * can be called only from moodle_database class. * Unfortunately PHP's protected keyword is useless. * @param moodle_database $database */ public function __construct($database) { $this->database = $database; $this->start_backtrace = debug_backtrace(); array_shift($this->start_backtrace); } /** * Returns backtrace of the code starting exception. * @return array */ public function get_backtrace() { return $this->start_backtrace; } /** * Is the delegated transaction already used? * @return bool true if commit and rollback allowed, false if already done */ public function is_disposed() { return empty($this->database); } /** * Mark transaction as disposed, no more * commits and rollbacks allowed. * To be used only from moodle_database class * @return null */ public function dispose() { return $this->database = null; } /** * Commit delegated transaction. * The real database commit SQL is executed * only after committing all delegated transactions. * * Incorrect order of nested commits or rollback * at any level is resulting in rollback of SQL transaction. * * @return void */ public function allow_commit() { if ($this->is_disposed()) { throw new dml_transaction_exception('Transactions already disposed', $this); } $this->database->commit_delegated_transaction($this); } /** * Rollback all current delegated transactions. * * @param Exception|Throwable $e mandatory exception/throwable * @return void */ public function rollback($e) { if ($this->is_disposed()) { throw new dml_transaction_exception('Transactions already disposed', $this); } $this->database->rollback_delegated_transaction($this, $e); } }