PrefetchPartitionsRequest.h

/*
 * Copyright (C) 2020 HERE Europe B.V.
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * License-Filename: LICENSE
 */
 
#pragma once
 
#include <sstream>
#include <string>
#include <utility>
#include <vector>
 
#include <olp/core/porting/optional.h>
#include <olp/core/thread/TaskScheduler.h>
#include <olp/dataservice/read/DataServiceReadApi.h>
#include <olp/dataservice/read/FetchOptions.h>
 
namespace olp {
namespace dataservice {
namespace read {
 
class DATASERVICE_READ_API PrefetchPartitionsRequest final {
 public:
  using PartitionIds = std::vector<std::string>;
 
  PrefetchPartitionsRequest& WithPartitionIds(PartitionIds partition_ids) {
    partition_ids_ = std::move(partition_ids);
    return *this;
  }
 
  inline const PartitionIds& GetPartitionIds() const { return partition_ids_; }
 
  const porting::optional<std::string>& GetBillingTag() const {
    return billing_tag_;
  }
 
  template <class T = porting::optional<std::string>>
  PrefetchPartitionsRequest& WithBillingTag(T&& billing_tag) {
    billing_tag_ = std::forward<T>(billing_tag);
    return *this;
  }
 
  uint32_t GetPriority() const { return priority_; }
 
  PrefetchPartitionsRequest& WithPriority(uint32_t priority) {
    priority_ = priority;
    return *this;
  }
 
  std::string CreateKey(
      const std::string& layer_id,
      porting::optional<int64_t> version = porting::none) const {
    std::stringstream out;
    out << layer_id;
    if (version) {
      out << "@" << *version;
    }
    out << "^" << partition_ids_.size();
    if (!partition_ids_.empty()) {
      out << "[" << partition_ids_.front() << ", ...]";
    }
    if (GetBillingTag()) {
      out << "$" << *GetBillingTag();
    }
    out << "*" << priority_;
    return out.str();
  }
 
 private:
  PartitionIds partition_ids_;
  porting::optional<std::string> billing_tag_;
  uint32_t priority_{thread::LOW};
};
 
}  // namespace read
}  // namespace dataservice
}  // namespace olp