public void addClientInterestList(ClientProxyMembershipID clientId, boolean receiveValues) {
    // This happens under synchronization on HAContainer.
    if (receiveValues) {
      if (_clientInterestList == null) {
        _clientInterestList = ConcurrentHashMap.newKeySet();
      }
      _clientInterestList.add(clientId);
    } else {
      if (_clientInterestListInv == null) {
        _clientInterestListInv = ConcurrentHashMap.newKeySet();
      }
      _clientInterestListInv.add(clientId);
    }
  }
@see HAEventWrapper#fromData(DataInput, DeserializationContext)
@see HAContainerRegion#get(Object)
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/ClientUpdateMessageImpl.java