private void onPing(PingFrame frame) {
int pingId = frame.getPingId();
if (pingId % 2 == pingIds.get() % 2) {
PingResultInfo pingResultInfo = new PingResultInfo(frame.getPingId());
notifyOnPing(listener, pingResultInfo);
flush();
} else {
control(null, frame, 0, TimeUnit.MILLISECONDS, new Callback.Adapter());
}
}
