strategy-info-host.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NFD_DAEMON_TABLE_STRATEGY_INFO_HOST_HPP
#define NFD_DAEMON_TABLE_STRATEGY_INFO_HOST_HPP

#include "fw/strategy-info.hpp"

namespace nfd {

class StrategyInfoHost
{
public:
  template<typename T>
  shared_ptr<T>
  getStrategyInfo() const;

  template<typename T>
  void
  setStrategyInfo(shared_ptr<T> strategyInfo);

  template<typename T, typename ...A>
  shared_ptr<T>
  getOrCreateStrategyInfo(A&&... args);

  void
  clearStrategyInfo();

private:
  std::map<int, shared_ptr<fw::StrategyInfo>> m_items;
};


template<typename T>
shared_ptr<T>
StrategyInfoHost::getStrategyInfo() const
{
  static_assert(std::is_base_of<fw::StrategyInfo, T>::value,
                "T must inherit from StrategyInfo");

  auto it = m_items.find(T::getTypeId());
  if (it == m_items.end()) {
    return nullptr;
  }
  return static_pointer_cast<T, fw::StrategyInfo>(it->second);
}

template<typename T>
void
StrategyInfoHost::setStrategyInfo(shared_ptr<T> item)
{
  static_assert(std::is_base_of<fw::StrategyInfo, T>::value,
                "T must inherit from StrategyInfo");

  if (item == nullptr) {
    m_items.erase(T::getTypeId());
  }
  else {
    m_items[T::getTypeId()] = item;
  }
}

template<typename T, typename ...A>
shared_ptr<T>
StrategyInfoHost::getOrCreateStrategyInfo(A&&... args)
{
  static_assert(std::is_base_of<fw::StrategyInfo, T>::value,
                "T must inherit from StrategyInfo");

  shared_ptr<T> item = this->getStrategyInfo<T>();
  if (!static_cast<bool>(item)) {
    item = make_shared<T>(std::forward<A>(args)...);
    this->setStrategyInfo(item);
  }
  return item;
}

} // namespace nfd

#endif // NFD_DAEMON_TABLE_STRATEGY_INFO_HOST_HPP