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<?php
namespace Elastica;
/**
* scan and scroll object
*
* @category Xodoa
* @package Elastica
* @author Manuel Andreo Garcia <andreo.garcia@gmail.com>
* @link http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/scan-scroll.html
*/
class ScanAndScroll implements \Iterator {
/**
* time value parameter
*
* @link http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-scroll.html
* @var string
*/
public $expiryTime;
/**
* @var int
*/
public $sizePerShard;
/**
* @var Search
*/
protected $_search;
/**
* @var null|string
*/
protected $_nextScrollId = null;
/**
* @var null|string
*/
protected $_lastScrollId = null;
/**
* @var null|ResultSet
*/
protected $_currentResultSet = null;
/**
* Constructs scroll iterator object
*
* @param Search $search
* @param string $expiryTime
* @param int $sizePerShard
*/
public function __construct(Search $search, $expiryTime = '1m', $sizePerShard = 1000) {
$this->_search = $search;
$this->expiryTime = $expiryTime;
$this->sizePerShard = $sizePerShard;
}
/**
* Return the current result set
*
* @link http://php.net/manual/en/iterator.current.php
* @return ResultSet
*/
public function current() {
return $this->_currentResultSet;
}
/**
* Perform next scroll search
*
* @link http://php.net/manual/en/iterator.next.php
* @return void
*/
public function next() {
$this->_scroll();
}
/**
* Return the scroll id of current scroll request
*
* @link http://php.net/manual/en/iterator.key.php
* @return string
*/
public function key() {
return $this->_lastScrollId;
}
/**
* Returns true if current result set contains one hit
*
* @link http://php.net/manual/en/iterator.valid.php
* @return boolean
*/
public function valid() {
return
$this->_nextScrollId !== null
&& $this->_currentResultSet !== null
&& $this->_currentResultSet->count() > 0;
}
/**
* Start the initial scan search
* @link http://php.net/manual/en/iterator.rewind.php
* @throws \Elastica\Exception\InvalidException
* @return void
*/
public function rewind() {
$this->_search->getQuery()->setSize($this->sizePerShard);
$this->_search->setOption(Search::OPTION_SEARCH_TYPE, Search::OPTION_SEARCH_TYPE_SCAN);
$this->_search->setOption(Search::OPTION_SCROLL, $this->expiryTime);
// initial scan request
$this->_setScrollId($this->_search->search());
// trigger first scroll request
$this->_scroll();
}
/**
* Perform next scroll search
* @throws \Elastica\Exception\InvalidException
* @return void
*/
protected function _scroll() {
$this->_search->setOption(Search::OPTION_SEARCH_TYPE, Search::OPTION_SEARCH_TYPE_SCROLL);
$this->_search->setOption(Search::OPTION_SCROLL_ID, $this->_nextScrollId);
$resultSet = $this->_search->search();
$this->_currentResultSet = $resultSet;
$this->_setScrollId($resultSet);
}
/**
* Save last scroll id and extract the new one if possible
* @param ResultSet $resultSet
*/
protected function _setScrollId(ResultSet $resultSet) {
$this->_lastScrollId = $this->_nextScrollId;
$this->_nextScrollId = null;
if($resultSet->getResponse()->isOk()) {
$this->_nextScrollId = $resultSet->getResponse()->getScrollId();
}
}
}
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