@NotNull Set<ApolloMutationCall> activeMutationCalls(@NotNull OperationName operationName) {
    return activeCalls(activeMutationCalls, operationName);
  }
@ NotNull Set < ApolloMutationCall > activeMutationCalls ( @ NotNull OperationName operationName ) { return activeCalls ( activeMutationCalls , operationName ) ; }
Returns currently active {@link ApolloMutationCall} calls by operation name.

@param operationName query operation name
@return set of active mutation calls