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<?php |
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namespace Aoe\AoeDbSequenzer; |
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/*************************************************************** |
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* Copyright notice |
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* |
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* (c) 2017 AOE GmbH ([email protected]) |
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* All rights reserved |
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* |
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* This script is part of the TYPO3 project. The TYPO3 project is |
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* free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* The GNU General Public License can be found at |
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* http://www.gnu.org/copyleft/gpl.html. |
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* |
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* This script is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* This copyright notice MUST APPEAR in all copies of the script! |
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***************************************************************/ |
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/** |
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* Sequenzer is used to generate system wide independent IDs |
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* @package Aoe\AoeDbSequenzer |
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*/ |
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class Sequenzer |
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{ |
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/** |
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* @var string |
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*/ |
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const SEQUENZER_TABLE = 'tx_aoedbsequenzer_sequenz'; |
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/** |
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* @var \mysqli |
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*/ |
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private $dbLink; |
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/** |
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* @var integer |
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*/ |
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private $defaultStart = 0; |
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/** |
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* @var integer |
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*/ |
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private $defaultOffset = 1; |
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/** |
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* @var integer |
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*/ |
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private $checkInterval = 120; |
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/** |
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* @param integer $defaultStart to set |
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*/ |
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public function setDefaultStart($defaultStart) |
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{ |
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$this->defaultStart = $defaultStart; |
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} |
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/** |
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* @param integer $defaultOffset to set |
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*/ |
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public function setDefaultOffset($defaultOffset) |
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{ |
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$this->defaultOffset = $defaultOffset; |
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} |
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/** |
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* sets mysql dblink with DB connection |
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* @param null $dbLink |
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*/ |
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public function setDbLink($dbLink = null) |
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{ |
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if (is_null($dbLink)) { |
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$this->dbLink = $GLOBALS['TYPO3_DB']->getDatabaseHandle(); |
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} else { |
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$this->dbLink = $dbLink; |
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} |
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} |
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/** |
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* returns next free id in the sequenz of the table |
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* @param $table |
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* @param int $depth |
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* @return int |
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* @throws \Exception |
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*/ |
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public function getNextIdForTable($table, $depth = 0) |
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{ |
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if ($depth > 99) { |
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throw new \Exception( |
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'The sequenzer cannot return IDs for this table -' . $table . ' Too many recursions - maybe to much load?', |
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1512378158 |
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); |
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} |
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$result = $this->query('SELECT * FROM ' . self::SEQUENZER_TABLE . ' WHERE tablename=\'' . $this->escapeString($table) . '\''); |
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$row = mysqli_fetch_assoc($result); |
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if (!isset ($row ['current'])) { |
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$this->initSequenzerForTable($table); |
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return $this->getNextIdForTable($table, ++$depth); |
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//throw new Exception('The sequenzer cannot return IDs for this table -'.$table.'- its not configured!'); |
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} elseif ($row ['timestamp'] + $this->checkInterval < $GLOBALS ['EXEC_TIME']) { |
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$defaultStartValue = $this->getDefaultStartValue($table); |
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$isValueOutdated = ($row ['current'] < $defaultStartValue); |
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$isOffsetChanged = ($row ['offset'] != $this->defaultOffset); |
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$isStartChanged = ($row ['current'] % $this->defaultOffset != $this->defaultStart); |
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if ($isValueOutdated || $isOffsetChanged || $isStartChanged) { |
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$row ['current'] = $defaultStartValue; |
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} |
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} |
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$new = $row ['current'] + $row ['offset']; |
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$updateTimeStamp = $GLOBALS ['EXEC_TIME']; |
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$res2 = $this->query('UPDATE ' . self::SEQUENZER_TABLE . ' SET current=' . $new . ', timestamp=' . $updateTimeStamp . ' WHERE timestamp=' . $row ['timestamp'] . ' AND tablename=\'' . $this->escapeString($table) . '\''); |
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if ($res2 && mysqli_affected_rows($this->dbLink) > 0) { |
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return $new; |
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} else { |
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return $this->getNextIdForTable($table, ++$depth); |
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} |
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} |
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/** |
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* Gets the default start value for a given table. |
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* @param $table |
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* @return int |
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* @throws \Exception |
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*/ |
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private function getDefaultStartValue($table) |
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{ |
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$result = $this->query('SELECT max(uid) as max FROM ' . $table); |
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$row = mysqli_fetch_assoc($result); |
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$currentMax = $row ['max'] + 1; |
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$start = $this->defaultStart + ($this->defaultOffset * ceil($currentMax / $this->defaultOffset)); |
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return $start; |
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} |
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/** |
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* if no sehduler entry for the table yet exists, this method initialises the sequenzer to fit offest and start and current max value in the table |
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* |
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* @param string $table |
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*/ |
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private function initSequenzerForTable($table) |
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{ |
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$start = $this->getDefaultStartValue($table); |
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$insert = 'INSERT INTO ' . self::SEQUENZER_TABLE . ' ( tablename, current, offset, timestamp ) VALUES ( \'' . $this->escapeString($table) . '\', ' . $start . ',' . intval($this->defaultOffset) . ',' . $GLOBALS ['EXEC_TIME'] . ' )'; |
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$this->query($insert); |
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} |
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/** |
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* @param $string |
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* @return string |
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*/ |
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private function escapeString($string) |
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{ |
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return mysqli_escape_string($this->dbLink, $string); |
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} |
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/** |
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* @param $sql |
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* @return bool|\mysqli_result |
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* @throws \Exception |
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*/ |
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private function query($sql) |
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{ |
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$result = mysqli_query($this->dbLink, $sql); |
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if (mysqli_error($this->dbLink)) { |
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throw new \Exception( |
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mysqli_error($this->dbLink), mysqli_errno($this->dbLink), |
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1512378208 |
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); |
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} |
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return $result; |
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} |
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} |
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AOEpeople /
aoe_dbsequenzer
