/**
* Execute command by sending data to server, receive initial reply
* @throws null|OrientDBException
* @throws OrientDBException
* @return mixed
*/
public function execute()
{
$this->socket->debug = $this->debug;
$this->socket->send($this->requestBytes);
if (is_null($this->parent->protocolVersion)) {
$this->debugCommand('protocol_version');
$serverProtocolVersion = $this->readShort();
$this->parent->setProtocolVersion($serverProtocolVersion);
}
if ($this->opType == self::DB_CLOSE) {
// No incoming bytes
return null;
}
$this->debugCommand('request_status');
$this->requestStatus = $this->readByte();
$this->debugCommand('TransactionID');
$requestTransactionID = $this->readInt();
if ($requestTransactionID !== $this->currentTransactionID) {
throw new OrientDBException('Transaction ID mismatch');
}
if ($this->requestStatus === chr(OrientDBCommandAbstract::STATUS_SUCCESS)) {
$data = $this->parseResponse();
if ($this->opType === self::DB_OPEN) {
$this->parent->setSessionIDDB($this->sessionID);
} elseif ($this->opType === self::CONNECT) {
$this->parent->setSessionIDServer($this->sessionID);
}
return $data;
} elseif ($this->requestStatus === chr(OrientDBCommandAbstract::STATUS_ERROR)) {
$exception = null;
while ($this->readByte() === chr(OrientDBCommandAbstract::STATUS_ERROR)) {
$this->debugCommand('exception_javaclass');
$javaException = $this->readString();
$this->debugCommand('exception_message');
$javaExceptionDescr = $this->readString();
$exception = new OrientDBException($javaException . ': ' . $javaExceptionDescr, 0, is_null($exception) ? null : $exception);
}
throw $exception;
} else {
throw new OrientDBException('Unknown error');
}
}
