@Override
        public boolean add(RowModel o) {
          l.handleRowModel(ClientSideCellSetModel.this, o);
          listenerInvoked = true;
          return false;
        }
Install a listener for row model on this object. If l is null, the listener is removed again.
hbase-rest/src/test/java/org/apache/hadoop/hbase/rest/TestTableScan.java