objectpool.php

См. документацию.

<?
namespace Bitrix\Sale\Delivery\Services;

final class ObjectPool
{
    protected $usage = array();
    protected $objects = array();
    protected $maxObjectsCount = 0;
 
    public function __construct($maxObjectsCount = 0)
    {
        $this->maxObjectsCount = $maxObjectsCount;
    }
 
    public function getObject(array $fields)
    {
        $result = null;
        $index = $this->createIndex($fields);
 
        if(!isset($this->objects[$index]))
        {
            if($this->maxObjectsCount > 0 && count($this->objects) > $this->maxObjectsCount)
                $this->deleteOutdatedObject();
 
            $result = $this->createObject($index, $fields);
        }
        else
        {
            $result = $this->objects[$index];
            unset($this->usage[array_search($index, $this->usage)]);
        }
 
        array_push($this->usage, $index);
        return $result;
    }
 
    protected function createObject($index, array $fields)
    {
        $this->objects[$index] = Manager::createObject($fields);
        return $this->objects[$index];
    }
 
    protected function deleteOutdatedObject()
    {
        reset($this->usage);
        unset($this->objects[current($this->usage)]);
        unset($this->usage[key($this->usage)]);
    }
 
    protected function createIndex(array $fields)
    {
        return intval($fields['ID']) > 0 ? intval($fields['ID']) : md5(serialize($fields));
    }
}