includes/libs/rdbms/database/utils/TransactionIdentifier.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20 namespace Wikimedia\Rdbms;
  21
  22 use Stringable;
  23
  24 /**
  25  * Class used for token representing identifiers for atomic transactions from IDatabase instances
  26  *
  27  * @ingroup Database
  28  * @internal
  29  */
  30 class TransactionIdentifier implements Stringable {
  31         /** @var string Application-side ID of the active transaction or an empty string otherwise */
  32         private $id = '';
  33
  34         public function __construct() {
  35                 static $nextId;
  36                 $nextId = ( $nextId !== null ? $nextId++ : mt_rand() ) % 0xffff;
  37                 $this->id = sprintf( '%06x', mt_rand( 0, 0xffffff ) ) . sprintf( '%04x', $nextId );
  38         }
  39
  40         public function __toString() {
  41                 return $this->id;
  42         }
  43 }