21.2. Node Authorization in Library Mode

public class AuthorizingServerCallbackHandler implements CallbackHandler {

@Override
public void handle(Callback[] callbacks) throws IOException,
UnsupportedCallbackException {
        for (Callback callback : callbacks) {
            <!-- Additional configuration information here -->
            if (callback instanceof AuthorizeCallback) {
                AuthorizeCallback acb = (AuthorizeCallback) callback;
                if (!"myclusterrole".equals(acb.getAuthenticationID()))) {
                    throw new SecurityException("Unauthorized node " +user);
            }
            <!-- Additional configuration information here -->
        }
    }
}