protected void checkClosed()
    {
        if( sock == null )
            throw new ConnectorException( "Connection is closed:" + remoteAddress );
    }
A straight forward socket-based connector implementation that
 does not use any separate threading.  It relies completely on
 the buffering in the OS network layer.

 @version   $Revision$
 @author    Paul Speed
jme3-networking/src/main/java/com/jme3/network/kernel/tcp/SocketConnector.java