/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#ifndef TENSORFLOW_CORE_COMMON_RUNTIME_NULL_REQUEST_COST_ACCESSOR_H_
#define TENSORFLOW_CORE_COMMON_RUNTIME_NULL_REQUEST_COST_ACCESSOR_H_

#include "tensorflow/core/common_runtime/request_cost_accessor_registry.h"

namespace tensorflow {

// NullRequestCostAccessor always returns nullptr as the RequestCost of current
// rpc. It's created to allow callers to skip collecting the request cost.
class NullRequestCostAccessor : public RequestCostAccessor {
 public:
  // Always returns nullptr as the RequestCost of current rpc.
  RequestCost* GetRequestCost() const override;
};

}  // namespace tensorflow

#endif  // TENSORFLOW_CORE_COMMON_RUNTIME_NULL_REQUEST_COST_ACCESSOR_H_
