import java.util.Set
import java.util.Collections
import org.opendaylight.yangtools.concepts.AbstractObjectRegistration
-import org.opendaylight.controller.md.sal.common.impl.ListenerRegistry
import org.opendaylight.controller.sal.core.api.RpcRegistrationListener
import org.slf4j.LoggerFactory
+import org.opendaylight.yangtools.concepts.util.ListenerRegistry
class RpcRouterImpl implements RpcRouter, Identifiable<String> {