unsolicited-data-policy.hpp

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

#include "face/face.hpp"

namespace nfd {
namespace fw {

enum class UnsolicitedDataDecision {
  DROP, 
  CACHE 
};

std::ostream&
operator<<(std::ostream& os, UnsolicitedDataDecision d);

class UnsolicitedDataPolicy : noncopyable
{
public:
  virtual ~UnsolicitedDataPolicy() = default;

  virtual UnsolicitedDataDecision
  decide(const Face& inFace, const Data& data) const = 0;

public: // registry
  template<typename P>
  static void
  registerPolicy(const std::string& key)
  {
    Registry& registry = getRegistry();
    BOOST_ASSERT(registry.count(key) == 0);
    registry[key] = [] { return make_unique<P>(); };
  }

  static unique_ptr<UnsolicitedDataPolicy>
  create(const std::string& key);

private:
  typedef std::function<unique_ptr<UnsolicitedDataPolicy>()> CreateFunc;
  typedef std::map<std::string, CreateFunc> Registry; // indexed by key

  static Registry&
  getRegistry();
};

class DropAllUnsolicitedDataPolicy : public UnsolicitedDataPolicy
{
public:
  virtual UnsolicitedDataDecision
  decide(const Face& inFace, const Data& data) const final;
};

class AdmitLocalUnsolicitedDataPolicy : public UnsolicitedDataPolicy
{
public:
  virtual UnsolicitedDataDecision
  decide(const Face& inFace, const Data& data) const final;
};

class AdmitNetworkUnsolicitedDataPolicy : public UnsolicitedDataPolicy
{
public:
  virtual UnsolicitedDataDecision
  decide(const Face& inFace, const Data& data) const final;
};

class AdmitAllUnsolicitedDataPolicy : public UnsolicitedDataPolicy
{
public:
  virtual UnsolicitedDataDecision
  decide(const Face& inFace, const Data& data) const final;
};

typedef DropAllUnsolicitedDataPolicy DefaultUnsolicitedDataPolicy;

} // namespace fw
} // namespace nfd

#define NFD_REGISTER_UNSOLICITED_DATA_POLICY(P, key)                \
static class NfdAuto ## P ## UnsolicitedDataPolicyRegistrationClass \
{                                                                   \
public:                                                             \
  NfdAuto ## P ## UnsolicitedDataPolicyRegistrationClass()          \
  {                                                                 \
    ::nfd::fw::UnsolicitedDataPolicy::registerPolicy<P>(key);       \
  }                                                                 \
} g_nfdAuto ## P ## UnsolicitedDataPolicyRegistrationVariable

#endif // NFD_DAEMON_FW_UNSOLICITED_DATA_POLICY_HPP