/**
 * Copyright 2021 Huawei Technologies Co., Ltd
 *
 * 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 MINDSPORE_CCSRC_PS_SERVER_ITERATION_H_
#define MINDSPORE_CCSRC_PS_SERVER_ITERATION_H_

#include <memory>
#include <vector>
#include "ps/core/communicator/communicator_base.h"
#include "ps/server/common.h"
#include "ps/server/round.h"
#include "ps/server/local_meta_store.h"

namespace mindspore {
namespace ps {
namespace server {
// In server's logic, Iteration is the minimum execution unit. For each execution, it consists of multiple kinds of
// Rounds, only after all the rounds are finished, this iteration is considered as completed.
class Iteration {
 public:
  Iteration();
  ~Iteration() = default;

  // Add a round for the iteration. This method will be called multiple times for each round.
  void AddRound(const std::shared_ptr<Round> &round);

  // Initialize all the rounds in the iteration.
  void InitRounds(const std::vector<std::shared_ptr<core::CommunicatorBase>> &communicators,
                  const TimeOutCb &timeout_cb, const FinishIterCb &finish_iteration_cb);

  // The server proceeds to the next iteration only after the last iteration finishes.
  void ProceedToNextIter();

  const std::vector<std::shared_ptr<Round>> &rounds();

 private:
  std::vector<std::shared_ptr<Round>> rounds_;

  // Server's current iteration number.
  size_t iteration_num_;
};
}  // namespace server
}  // namespace ps
}  // namespace mindspore
#endif  // MINDSPORE_CCSRC_PS_SERVER_ITERATION_H_