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<?php
namespace Elastica;
/**
* Scan and Scroll Iterator.
*
* @author Manuel Andreo Garcia <andreo.garcia@gmail.com>
*
* @link http://www.elastic.co/guide/en/elasticsearch/guide/current/scan-scroll.html
*/
class ScanAndScroll extends Scroll
{
/**
* @var int
*/
public $sizePerShard;
/**
* Constructor.
*
* @param Search $search
* @param string $expiryTime
* @param int $sizePerShard
*/
public function __construct(Search $search, $expiryTime = '1m', $sizePerShard = 1000)
{
$this->sizePerShard = $sizePerShard;
parent::__construct($search, $expiryTime);
}
/**
* Initial scan search.
*
* @link http://php.net/manual/en/iterator.rewind.php
*/
public function rewind()
{
// reset state
$this->_nextScrollId = null;
$this->_options = array(null, null, null, null);
$this->_saveOptions();
// initial scan request
$this->_search->getQuery()->setSize($this->sizePerShard);
$this->_search->setOption(Search::OPTION_SCROLL, $this->expiryTime);
$this->_search->setOption(Search::OPTION_SCROLL_ID, null);
$this->_search->setOption(Search::OPTION_SEARCH_TYPE, Search::OPTION_SEARCH_TYPE_SCAN);
$this->_setScrollId($this->_search->search());
$this->_revertOptions();
// first scroll request
$this->next();
}
/**
* Save all search options manipulated by Scroll.
*/
protected function _saveOptions()
{
$query = $this->_search->getQuery();
if ($query->hasParam('size')) {
$this->_options[3] = $query->getParam('size');
}
parent::_saveOptions();
}
/**
* Revert search options to previously saved state.
*/
protected function _revertOptions()
{
$this->_search->getQuery()->setSize($this->_options[3]);
parent::_revertOptions();
}
}
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