public void registerChannelNow(SelectableChannel channel,  int selectionKeys, SelectorHandler handlerInfo) throws IOException {
	if (Thread.currentThread() != selectorThread) {
		throw new IOException("Method can only be called from selector thread");
	}

	if (!channel.isOpen()) { 
		throw new IOException("Channel is not open.");
	}

	try {
		if (channel.isRegistered()) {
			SelectionKey sk = channel.keyFor(selector);   
			sk.interestOps(selectionKeys);
			Object previousAttach = sk.attach(handlerInfo);
		} else {  
			channel.configureBlocking(false);
			channel.register(selector, selectionKeys, handlerInfo);      
		}  
	} catch (ClosedChannelException e) {
		IOException ioe = new IOException("Error registering channel.");
		ioe.initCause(e);
		throw ioe;      
	}
}