1: <?php
 2: /**
 3:  * Magento
 4:  *
 5:  * NOTICE OF LICENSE
 6:  *
 7:  * This source file is subject to the Open Software License (OSL 3.0)
 8:  * that is bundled with this package in the file LICENSE.txt.
 9:  * It is also available through the world-wide-web at this URL:
10:  * http://opensource.org/licenses/osl-3.0.php
11:  * If you did not receive a copy of the license and are unable to
12:  * obtain it through the world-wide-web, please send an email
13:  * to license@magentocommerce.com so we can send you a copy immediately.
14:  *
15:  * DISCLAIMER
16:  *
17:  * Do not edit or add to this file if you wish to upgrade Magento to newer
18:  * versions in the future. If you wish to customize Magento for your
19:  * needs please refer to http://www.magentocommerce.com for more information.
20:  *
21:  * @category    Mage
22:  * @package     Mage_Cron
23:  * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
24:  * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
25:  */
26: 
27: 
28: /**
29:  * Schedule mysql4 resource
30:  *
31:  * @category    Mage
32:  * @package     Mage_Cron
33:  * @author      Magento Core Team <core@magentocommerce.com>
34:  */
35: class Mage_Cron_Model_Resource_Schedule extends Mage_Core_Model_Resource_Db_Abstract
36: {
37:     /**
38:      * Initialize resource
39:      *
40:      */
41:     public function _construct()
42:     {
43:         $this->_init('cron/schedule', 'schedule_id');
44:     }
45: 
46:     /**
47:      * If job is currently in $currentStatus, set it to $newStatus
48:      * and return true. Otherwise, return false and do not change the job.
49:      * This method is used to implement locking for cron jobs.
50:      *
51:      * @param unknown_type $scheduleId
52:      * @param String $newStatus
53:      * @param String $currentStatus
54:      * @return unknown
55:      */
56:     public function trySetJobStatusAtomic($scheduleId, $newStatus, $currentStatus)
57:     {
58:         $write = $this->_getWriteAdapter();
59:         $result = $write->update(
60:             $this->getTable('cron/schedule'),
61:             array('status' => $newStatus),
62:             array('schedule_id = ?' => $scheduleId, 'status = ?' => $currentStatus)
63:         );
64:         if ($result == 1) {
65:             return true;
66:         }
67:         return false;
68:     }
69: }
70: