protected void checkRunning()
    {
        if( !isRunning )
            throw new IllegalStateException( "Client is not started." );
    }
A default implementation of the Client interface that delegates
 its network connectivity to a kernel.Connector.

 @version   $Revision$
 @author    Paul Speed
jme3-networking/src/main/java/com/jme3/network/base/DefaultClient.java