code: def engineIncluded(self, name):
          
          if self._engines is None:
              self._engines = self._dbconn.getStorageEngines()
          return self.envCheckFilter('engine', name) and name in self._engines
docs: Utility method to check if a storage engine is included in graphs.
          
          @param name: Name of storage engine.
          @return:     Returns True if included in graphs, False otherwise.