def store(graph)
      begin
        statements = graph.each_statement.to_a
        @client.insert(statements)
        graph
      rescue => e
        raise TriplestoreAdapter::TriplestoreException, "store graph in triplestore cache failed with exception: #{e.message}"
      end
    end
def store(graph)
      begin
        statements = graph.each_statement.to_a
        @client.insert(statements)
        graph
      rescue => e
        raise TriplestoreAdapter::TriplestoreException, "store graph in triplestore cache failed with exception: #{e.message}"
      end
    end
Store the graph in the triplestore cache

 @param [RDF::Graph] graph
 @return [RDF::Graph]
 @raise [Exception] if client fails to store the graph