/**
* Creates a valid selection key or throws an exception. An
* exception will be thrown if the stream is blocking or closed;
* the interest ops are invalid or the attachment is present
* and not an object.
*
* @param MioStream $stream
* @param int $interest_ops
* @param Object $attachment
* @throws MioException
*/
public function __construct($stream, $interest_ops, $attachment = null)
{
if ($stream->isBlocking()) {
throw new MioBlockingException("Stream must be in non-blocking mode to be registered");
}
if (!$stream->isOpen()) {
throw new MioClosedException("Stream must be open to be registered");
}
$this->stream = $stream;
$this->setInterestOps($interest_ops);
$this->attach($attachment);
}
