code: def get_key_for_schema_and_document_string(self, schema, request_string):
          # type: (GraphQLSchema, str) -> int
          
          if self.use_consistent_hash:
              schema_id = get_unique_schema_id(schema)
              document_id = get_unique_document_id(request_string)
              return hash((schema_id, document_id))
          return hash((schema, request_string))
docs: This method returns a unique key given a schema and a request_string