/**
* Look for a new job that can be processed with the current abilities and
* from the specified group (or any if null).
*
* @param array $capabilities Available QueueWorkerTasks.
* @param string|null $group Request a job from this group, (from any group if null)
* @return \Queue\Model\Entity\QueuedJob|null
*/
public function requestJob(array $capabilities, $group = null)
{
$now = new Time();
$nowStr = $now->toDateTimeString();
$query = $this->find();
$options = ['conditions' => ['completed IS' => null, 'OR' => []], 'fields' => ['age' => $query->newExpr()->add('IFNULL(TIMESTAMPDIFF(SECOND, "' . $nowStr . '", notbefore), 0)')], 'order' => ['priority' => 'ASC', 'age' => 'ASC', 'id' => 'ASC']];
if ($group !== null) {
$options['conditions']['job_group'] = $group;
}
// Generate the task specific conditions.
foreach ($capabilities as $task) {
list($plugin, $name) = pluginSplit($task['name']);
$timeoutAt = $now->copy();
$tmp = ['job_type' => $name, 'AND' => [['OR' => ['notbefore <' => $now, 'notbefore IS' => null]], ['OR' => ['fetched <' => $timeoutAt->subSeconds($task['timeout']), 'fetched IS' => null]]], 'failed <' => $task['retries'] + 1];
if (array_key_exists('rate', $task) && $tmp['job_type'] && array_key_exists($tmp['job_type'], $this->rateHistory)) {
$tmp['UNIX_TIMESTAMP() >='] = $this->rateHistory[$tmp['job_type']] + $task['rate'];
}
$options['conditions']['OR'][] = $tmp;
}
$job = $this->connection()->transactional(function () use($query, $options, $now) {
$job = $query->find('all', $options)->autoFields(true)->first();
if (!$job) {
return null;
}
$key = $this->key();
$job = $this->patchEntity($job, ['workerkey' => $key, 'fetched' => $now]);
return $this->save($job);
});
if (!$job) {
return null;
}
$this->rateHistory[$job['job_type']] = $now->toUnixString();
return $job;
}
