Method process

example/use-anyflow-with-brpc/parse.cpp:7–12

class Parse : public ::babylon::anyflow::GraphProcessor {
  virtual int process() noexcept override {
    user_id = request->user_id();
    // Use ref to make it zero copy
    query.emit().ref(request->query());
    return 0;
  }

  // clang-format off
  ANYFLOW_INTERFACE(