Basic NIO server

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.util.logging.Logger;

/**
 * A server that accepts and handles connections.
 */
public class Server {

    /**
     * The Logger of the server.
     */
    private static final Logger logger = Logger.getLogger(Server.class.getName());

    /**
     * The Selector of the server.
     */
    private final Selector selector;

    /**
     * The ServerSocketChannel of the server.
     */
    private final ServerSocketChannel serverSocketChannel;

    /**
     * The running status of the server.
     */
    private volatile boolean running;

    /**
     * Creates the server and configures the blocking.
     *
     * @throws IOException
     */
    public Server() throws IOException {
        selector = Selector.open();
        serverSocketChannel = ServerSocketChannel.open();
        serverSocketChannel.configureBlocking(false);
    }

    /**
     * Binds the server to the specific hostname and port.
     *
     * @param hostname The hostname the server is binded to.
     * @param port The port the server is binded to.
     *
     * @return The server instance.
     *
     * @throws IOException
     */
    public Server bind(final String hostname, final int port) throws IOException {
        if (!serverSocketChannel.isOpen() || !selector.isOpen()) {
            logger.info("Server has already been binded.");
            return this;
        }

        serverSocketChannel.bind(new InetSocketAddress(hostname, port));
        serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
        return this;
    }

    /**
     * Gets the running status of the server.
     *
     * @return The running status of the server.
     */
    public boolean isRunning() {
        return running;
    }

    /**
     * Sets the running status of the server.
     *
     * @param running The running status of the server.
     */
    public void setRunning(final boolean running) {
        this.running = running;
    }
}