/**
* Pops a message.
*
* @return array An array with the following keys:
* _id, receiver and body
*
* @throws EmptyQueueInternalException
*/
public function pop()
{
$item = $this->connectToStorageInternalWorker->connect()->find()->sort(['_id' => 1])->limit(1)->getNext();
if (!$item) {
throw new EmptyQueueInternalException();
}
$this->connectToStorageInternalWorker->connect()->remove(array('_id' => $item['_id']));
return $item;
}
/**
* Creates a message.
*
* @param string $receiver
* @param string $body
*
* @return string The already created message's id.
*/
public function enqueue($receiver, $body)
{
$message = uniqid();
$this->connectToStorageInternalWorker->connect()->insert(array('message' => $message, 'receiver' => $receiver, 'body' => $body));
return $message;
}
/**
* Collects messages.
*
* @return \Iterator
*/
public function collect()
{
return $this->connectToStorageInternalWorker->connect()->find()->fields(['_id' => 0]);
}
