/**
* @internal
*/
function __construct($opentok, $sessionId, $properties = array())
{
// unpack arguments
$defaults = array('mediaMode' => MediaMode::ROUTED, 'location' => null);
$properties = array_merge($defaults, array_intersect_key($properties, $defaults));
list($mediaMode, $location) = array_values($properties);
Validators::validateOpenTok($opentok);
Validators::validateSessionId($sessionId);
Validators::validateLocation($location);
Validators::validateMediaMode($mediaMode);
$this->opentok = $opentok;
$this->sessionId = $sessionId;
$this->location = $location;
$this->mediaMode = $mediaMode;
}