checks whether the client is already connected to the cluster . concode_field_sep String keyspace concode_elem_sep Cluster cluster concode_elem_sep Session session concode_elem_sep Logger LOG concode_field_sep boolean isClose concode_elem_sep Metadata getMetadata concode_elem_sep Set<Host> getAllHosts concode_elem_sep String getExecutorName concode_elem_sep void close concode_elem_sep Session connect
boolean function ( ) { return session == null ; }