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<?php
/**
* Table Definition for queue_item
*/
require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
class Queue_item extends Memcached_DataObject
{
###START_AUTOCODE
/* the code below is auto generated do not remove the above tag */
public $__table = 'queue_item'; // table name
public $id; // int(4) primary_key not_null
public $frame; // blob not_null
public $created; // datetime() not_null
public $claimed; // datetime()
/* Static get */
function staticGet($k,$v=null)
{ return Memcached_DataObject::staticGet('Queue_item',$k,$v); }
/* the code above is auto generated do not remove the tag below */
###END_AUTOCODE
/**
* @param mixed $transports name of a single queue or array of queues to pull from
* If not specified, checks all queues in the system.
*/
static function top($transports=null) {
$qi = new Queue_item();
if ($transports) {
if (is_array($transports)) {
// @fixme use safer escaping
$list = implode("','", array_map(array($qi, 'escape'), $transports));
$qi->whereAdd("transport in ('$list')");
} else {
$qi->transport = $transports;
}
}
$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 id = ' . $qi->id .
' for transport ' . $qi->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;
}
/**
* Release a claimed item.
*/
function releaseCLaim()
{
// DB_DataObject doesn't let us save nulls right now
$sql = sprintf("UPDATE queue_item SET claimed=NULL WHERE id=%d", $this->id);
$this->query($sql);
$this->claimed = null;
$this->encache();
}
}
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