gnu-social/classes/Queue_item.php

<?php
/**
 * Table Definition for queue_item
 */
require_once 'DB/DataObject.php';

class Queue_item extends DB_DataObject 
{
    ###START_AUTOCODE
    /* the code below is auto generated do not remove the above tag */

    public $__table = 'queue_item';                      // table name
    public $notice_id;                       // int(4)  primary_key not_null
    public $transport;                       // varchar(8)  primary_key not_null
    public $created;                         // datetime()   not_null
    public $claimed;                         // datetime()  

    /* Static get */
    function staticGet($k,$v=NULL) { return DB_DataObject::staticGet('Queue_item',$k,$v); }

    /* the code above is auto generated do not remove the tag below */
    ###END_AUTOCODE

    function sequenceKey() { return array(false, false); }
	
	static function top($transport) {

		$qi = new Queue_item();
		$qi->transport = $transport;
		$qi->orderBy('created');
		$qi->whereAdd('claimed is NULL');

		$qi->limit(1);

		$cnt = $qi->find(TRUE);

		if ($cnt) {
			# XXX: potential race condition
			# can we force it to only update if claimed is still NULL
			# (or old)?
			common_log(LOG_INFO, 'claiming queue item = ' . $qi->notice_id . ' for transport ' . $transport);
			$orig = clone($qi);
			$qi->claimed = common_sql_now();
			$result = $qi->update($orig);
			if ($result) {
				common_log(LOG_INFO, 'claim succeeded.');
				return $qi;
			} else {
				common_log(LOG_INFO, 'claim failed.');
			}
		}
		$qi = NULL;
		return NULL;
	}
}