code: public final boolean isDatastoreConnectionOpen() {
          if (_datastoreConnectionRef == null) {
              return false;
          }
          final UsageAwareDatastoreConnection<E> dataContextProvider = _datastoreConnectionRef.get();
          return isDataContextProviderOpen(dataContextProvider);
      }
docs: Gets whether the datacontext provider is already open / ready or if it
  has to be created.
  
  @return a boolean indicating if the datacontext provider is open