Re: Question about non-blocking NIO and Selection Keys

I am new to non-blocking socket i/o so please go easy on my terrible
code below :)

That being said, I have a socket that must be used for reading and
writing, but nothing else. So I initialize my socket early on as:

asyncSelector = new Selector();
sockC.configureBlocking(false);
sockC.register(asyncSelector, SelectionKey.OP_WRITE |
SelectionKey.OP_READ);

Now, whenever I need to write to my socket, I do the following:

public void write(ByteBuffer buf) throws ServerException {
   int bytesWritten = 0;
   int bytesToWrite = buf.remaining();

   while (bytesWritten < bytesToWrite) {
      limitBuffer(buf, bytesToWrite, bytesWritten,
MAX_BYTES_PER_BUF_WRITE);
      waitForOperation(SelectionKey.OP_WRITE);

      int bytesWrittenThisTime = sockC.write(buf);
      if (bytesWrittenThisTime == -1)
         throw new ServerException("Remote host unexpectedly closed
the connection");
      else
         bytesWritten += bytesWrittenThisTime;
   }
}

public void waitForOperation(int operation) throws ServerException {
   while (true) {
      try {
         if (asyncSelector.select() == 0)
            continue;
         Set<SelectionKey> selected = asyncSelector.selectedKeys();
         for (Iterator<SelectionKey> i = selected.iterator();
i.hasNext(); ) {
            if ((i.next().readyOps() & operation) != 0)
               return;
         }
      }
      catch (IOException e) {
         throw new ServerException("An error occured while performing
a socket operation.");
      }
   }
}

as such I think it's most likely to be the culprit. Can anyone
provide any observations or suggestions as how to improve this code?