/**
* Add a REquest.
*
* @param RequestInterface $request
* @return int
*/
public function add(RequestInterface $request)
{
// Tell the $request to use this handle.
$request->addMultiHandle($this->handle);
// Store the request.
$this->requests[] = $request;
// Return the request's key.
return count($this->requests) - 1;
}
