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<?php |
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namespace TBolier\RethinkQL\Response; |
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use TBolier\RethinkQL\Connection\ConnectionCursorInterface; |
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use TBolier\RethinkQL\Connection\ConnectionException; |
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use TBolier\RethinkQL\Query\MessageInterface; |
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use TBolier\RethinkQL\Types\Response\ResponseType; |
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class Cursor implements \Iterator |
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{ |
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/** |
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* @var ConnectionCursorInterface |
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*/ |
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private $connection; |
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/** |
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* @var int |
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*/ |
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private $token; |
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/** |
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* @var ResponseInterface |
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*/ |
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private $response; |
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/** |
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* @var int |
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*/ |
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private $index; |
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/** |
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* @var int |
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*/ |
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private $size; |
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/** |
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* @var bool |
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*/ |
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private $isComplete; |
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/** |
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* @var MessageInterface |
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*/ |
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private $message; |
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/** |
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* @param ConnectionCursorInterface $connection |
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* @param int $token |
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* @param ResponseInterface $response |
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* @param MessageInterface $message |
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*/ |
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public function __construct(ConnectionCursorInterface $connection, int $token, ResponseInterface $response, MessageInterface $message) |
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{ |
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$this->connection = $connection; |
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$this->token = $token; |
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$this->addResponse($response); |
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$this->message = $message; |
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} |
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/** |
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* @param ResponseInterface $response |
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*/ |
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private function addResponse(ResponseInterface $response) |
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{ |
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$this->index = 0; |
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$this->isComplete = $response->getType() === ResponseType::SUCCESS_SEQUENCE; |
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$this->size = \count($response->getData()); |
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$this->response = $response; |
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} |
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/** |
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* @return void |
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* @throws \Exception |
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*/ |
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private function seek(): void |
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{ |
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while ($this->index === $this->size) { |
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if ($this->isComplete) { |
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return; |
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} |
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$this->request(); |
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} |
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} |
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/** |
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* @return void |
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* @throws \Exception |
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*/ |
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private function request(): void |
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{ |
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try { |
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$response = $this->connection->continueQuery($this->token); |
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$this->addResponse($response); |
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} catch (\Exception $e) { |
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$this->isComplete = true; |
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$this->close(); |
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throw $e; |
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} |
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} |
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/** |
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* @return void |
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*/ |
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private function close(): void |
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{ |
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if (!$this->isComplete) { |
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$this->connection->stopQuery($this->token); |
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$this->isComplete = true; |
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} |
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$this->index = 0; |
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$this->size = 0; |
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$this->response = null; |
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} |
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/** |
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* @inheritdoc |
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* @throws \Exception |
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*/ |
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public function current() |
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{ |
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$this->seek(); |
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if ($this->valid()) { |
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return $this->response->getData()[$this->index]; |
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} |
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} |
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/** |
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* @inheritdoc |
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* @throws \Exception |
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*/ |
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public function next(): void |
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{ |
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$this->index++; |
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$this->seek(); |
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} |
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/** |
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* @inheritdoc |
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145
|
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*/ |
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1 |
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public function key(): int |
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{ |
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return $this->index; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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154
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2 |
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public function valid(): bool |
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{ |
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return (!$this->isComplete || ($this->index < $this->size)); |
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} |
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/** |
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* @inheritdoc |
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* @throws ConnectionException |
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*/ |
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1 |
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public function rewind(): void |
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{ |
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$this->close(); |
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$this->addResponse($this->connection->rewindFromCursor($this->message)); |
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} |
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} |
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tbolier /
php-rethink-ql
