/*
 * Copyright 2022 Google LLC
 *
 * 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 FCP_AGGREGATION_PROTOCOL_CHECKPOINT_PARSER_H_
#define FCP_AGGREGATION_PROTOCOL_CHECKPOINT_PARSER_H_

#include <memory>
#include <string>
#include <vector>

#include "absl/status/statusor.h"
#include "absl/strings/cord.h"
#include "fcp/aggregation/core/tensor.h"

namespace fcp::aggregation {

// Describes an abstract interface for parsing a checkpoint from a blob
// and returning a set of named tensors.
class CheckpointParser {
 public:
  virtual ~CheckpointParser() = default;

  // Gets a tensor by name.
  virtual absl::StatusOr<Tensor> GetTensor(const std::string& name) const = 0;
};

// Describes an abstract factory for creating instances of CheckpointParser.
class CheckpointParserFactory {
 public:
  virtual ~CheckpointParserFactory() = default;

  // Creates an instance of CheckpointParser with the provided serialized
  // checkpoint content.
  virtual absl::StatusOr<std::unique_ptr<CheckpointParser>> Create(
      const absl::Cord& serialized_checkpoint) const = 0;
};

}  // namespace fcp::aggregation

#endif  // FCP_AGGREGATION_PROTOCOL_CHECKPOINT_PARSER_H_