81 lines
2.9 KiB
PHP
81 lines
2.9 KiB
PHP
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<?php
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/**
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; under version 2
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* of the License (non-upgradable).
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*
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* This program 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (c) 2002-2008 (original work) Public Research Centre Henri Tudor & University of Luxembourg (under the project TAO & TAO2);
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* 2008-2010 (update and modification) Deutsche Institut für Internationale Pädagogische Forschung (under the project TAO-TRANSFER);
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* 2009-2012 (update and modification) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
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* 2013 (update and modification) Open Assessment Technologies SA;
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*/
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namespace oat\generis\model\kernel\uri;
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use oat\oatbox\service\ConfigurableService;
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use oat\generis\persistence\PersistenceManager;
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use common_persistence_SqlPersistence;
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/**
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* UriProvider implementation based on PHP microtime and rand().
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*
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* @access public
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* @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
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* @package generis
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*/
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class MicrotimeRandUriProvider extends ConfigurableService implements UriProvider
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{
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const OPTION_PERSISTENCE = 'persistence';
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const OPTION_NAMESPACE = 'namespace';
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// --- ASSOCIATIONS ---
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// --- ATTRIBUTES ---
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// --- OPERATIONS ---
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/**
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* @return common_persistence_SqlPersistence
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*/
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public function getPersistence()
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{
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return $this->getServiceLocator()->get(PersistenceManager::SERVICE_ID)->getPersistenceById($this->getOption(self::OPTION_PERSISTENCE));
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}
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/**
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* Generates a URI based on the value of PHP microtime() and rand().
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*
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* @access public
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* @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
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* @return string
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*/
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public function provide()
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{
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$uriExist = false;
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do {
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list($usec, $sec) = explode(" ", microtime());
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$uri = $this->getOption(self::OPTION_NAMESPACE) . 'i' . (str_replace(".", "", $sec . "" . $usec)) . rand(0, 1000);
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$sqlResult = $this->getPersistence()->query("SELECT COUNT(subject) AS num FROM statements WHERE subject = '" . $uri . "'");
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if ($row = $sqlResult->fetch()) {
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$uriExist = $row['num'] > 0;
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$sqlResult->closeCursor();
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}
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} while ($uriExist);
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return (string) $uri;
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}
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}
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