@Override
    protected Object getSourceDelegate( HostedConnection source ) {
        Object result = source.getAttribute(attributeName);
        if( result == null ) {
            miss(source);
        }
        return result;
    }
Returns the attributeName attribute of the supplied source
 HostConnection.  If there is no value at that attribute then
 the miss() method is called.
jme3-networking/src/main/java/com/jme3/network/util/SessionDataDelegator.java