static void routeSingleClientMessage(ClientUpdateMessage clientMessage,
      ClientProxyMembershipID clientProxyMembershipId) {
    CacheClientNotifier instance = ccnSingleton;
    if (instance != null) {
      instance.singletonRouteClientMessage(clientMessage,
          Collections.singleton(clientProxyMembershipId));
    }
  }
this is for server side registration of client queue
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/CacheClientNotifier.java