Iterator<SelectionKey> it = selector.selectedKeys().iterator();
while (it.hasNext()) {
SelectionKey sk = it.next();
it.remove();
try {
int readyOps = sk.readyOps();
sk.interestOps(sk.interestOps() & ~readyOps);
if (sender.process(sk, false)) {
total = total.add(bytes);
sender.reset();
sender.setMessage(buf);