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<?php
namespace Bitrix\Seo\BusinessSuite\Utils;
use Bitrix\Seo\BusinessSuite\Internals;
final class ServiceQueue
{
/** @var self[] $queue*/
private static $instancePool = [];
/** @var array $head */
private $head;
/**@var \Bitrix\Main\ORM\Query\Result $values*/
private $values;
public static function getInstance(string $type) : self
{
if(!array_key_exists($type,static::$instancePool))
{
static::$instancePool[$type] = new static($type);
}
return static::$instancePool[$type];
}
private function __construct(string $type)
{
$this->values = Internals\ServiceQueueTable::getList([
'select' => ['ID','SERVICE_TYPE','CLIENT_ID','TYPE'],
'filter' => ['=TYPE'=> $type ],
'order' => ['SORT' => 'DESC']
]);
$this->head = $this->getHead();
}
private function __clone()
{}
/**
* return head of sequence
* @return array|false|mixed
*/
public function getHead()
{
return $this->head = ($this->head? $this->head : $this->values->fetch());
}
/**
* remove head of sequence
* @throws \Exception
*/
public function removeHead()
{
if($this->head)
{
Internals\ServiceQueueTable::delete($this->head['ID']);
unset($this->head);
}
}
}