code: public List<String> getDoradusKeyspaces() {
          List<String> keyspaces = new ArrayList<>();
          // Use a temporary, no-keyspace session
          try (DBConn dbConn = createAndConnectConn(null)) {
              synchronized (m_schemaLock) {
                  Collection<String> keyspaceList = m_schemaMgr.getKeyspaces(dbConn);
                  for (String keyspace : keyspaceList) {
                      if (m_schemaMgr.columnFamilyExists(dbConn, keyspace, SchemaService.APPS_STORE_NAME)) {
                          keyspaces.add(keyspace);
                      }
                  }
              }
          }
          return keyspaces;
      }
docs: dropTenant