snapshot.h

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// === snapshot.h ======================================================================================================
//                                               Sen Infrastructure
//                   Released under the Apache License v2.0 (SPDX-License-Identifier Apache-2.0).
//                                    See the LICENSE.txt file for more information.
//                   © Airbus SAS, Airbus Helicopters, and Airbus Defence and Space SAU/GmbH/SAS.
// =====================================================================================================================
 
#ifndef SEN_DB_SNAPSHOT_H
#define SEN_DB_SNAPSHOT_H
 
#include "sen/core/meta/type.h"
#include "sen/core/obj/object.h"
 
namespace sen::db
{
 
class Input;

class Snapshot
{
  SEN_COPY_MOVE(Snapshot)
 
public:
  ~Snapshot() = default;
 
public:
  [[nodiscard]] ObjectId getObjectId() const noexcept;

  [[nodiscard]] const std::string& getName() const noexcept;

  [[nodiscard]] const std::string& getSessionName() const noexcept;

  [[nodiscard]] const std::string& getBusName() const noexcept;

  [[nodiscard]] const ConstTypeHandle<ClassType>& getType() const noexcept { return type_; }
 
public:
  [[nodiscard]] const Var& getPropertyAsVariant(const Property* property) const;

  [[nodiscard]] Span<const uint8_t> getPropertyAsBuffer(const Property* property) const;

  [[nodiscard]] Span<const uint8_t> getAllPropertiesBuffer() const noexcept;
 
private:
  friend class Input;
  Snapshot(ObjectId objectId,
           std::string objectName,
           std::string sessionName,
           std::string busName,
           ConstTypeHandle<ClassType> type,
           std::vector<uint8_t> buffer);
 
private:
  void extractBuffersIfNeeded() const;
 
private:
  ObjectId objectId_;
  std::string objectName_;
  std::string sessionName_;
  std::string busName_;
  ConstTypeHandle<ClassType> type_;
  std::vector<uint8_t> buffer_;
  mutable bool buffersExtracted_ = false;
  mutable std::unordered_map<const Property*, Var> varCache_;
  mutable std::unordered_map<MemberHash, Span<const uint8_t>> bufferCache_;
};
 
}  // namespace sen::db
 
#endif  // SEN_DB_SNAPSHOT_H