abstract class ServerSocket {
  /**
   * Constructs a new server socket, binds it to a given address and port,
   * and listens on it.
   */
  factory ServerSocket(String bindAddress, int port, int backlog) {
    return new _ServerSocket(bindAddress, port, backlog);
  }

  /**
   * The connection handler gets called when there is a new incoming
   * connection on the socket.
   */
  void set onConnection(void callback(Socket connection));

  /**
   * The error handler gets called when a socket error occurs.
   */
  void set onError(void callback(e));

  /**
   * Returns the port used by this socket.
   */
  int get port;

  /**
   * Closes the socket.
   */
  void close();
}