code: public boolean isSingleMember() {
  		final Address localAddress = getLocalAddress();
  		if (localAddress != null) {
  			final List<Address> clusterMembers = getClusterMembers();
  			return clusterMembers.size() == 1;
  		}
  		else {
  			return true;
  		}
  	}
docs: /*
  (non-Javadoc)
  @see MobicentsCluster#isSingleMember()