Simple::getHandledMessageMap

private function getHandledMessageMap(): CoreBaseMap
{
	if (empty($this->handledMessageMap))
	{
		$this->handledMessageMap = $this->getHandledMessageMapper()->getMap(
			[
				'QUEUE_ID' => $this->getQueue()->getQueueId(),
			],
			$this->getPackSize(),
			[
				'DATE_CREATE' => 'ASC'
			],
		);
	}

	return $this->handledMessageMap;
}