Method LookupOrCreate

tensorflow/core/framework/resource_mgr.h:640–661

template <typename T, bool use_dynamic_cast>
Status ResourceMgr::LookupOrCreate(const string& container, const string& name,
                                   T** resource,
                                   std::function<Status(T**)> creator) {
  CheckDeriveFromResourceBase<T>();
  *resource = nullptr;
  Status s;
  {
    tf_shared_lock l(mu_);
    s = LookupInternal<T, use_dynamic_cast>(container, name, resource);
    if (s.ok()) return s;
  }
  mutex_lock l(mu_);
  s = LookupInternal<T, use_dynamic_cast>(container, name, resource);
  if (s.ok()) return s;
  TF_RETURN_IF_ERROR(creator(resource));
  s = DoCreate(container, MakeTypeIndex<T>(), name, *resource);
  if (!s.ok()) {
    return errors::Internal("LookupOrCreate failed unexpectedly");
  }
  (*resource)->Ref();
  return s;
}

template <typename T>
Status ResourceMgr::Delete(const string& container, const string& name) {