/**
* @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.');
}
}
$qi = null;
return null;
}
static function top($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;
}
