cs-policy-priority-fifo.hpp

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

#include "cs-policy.hpp"
#include "common.hpp"
#include "core/scheduler.hpp"

namespace nfd {
namespace cs {
namespace priority_fifo {

typedef std::list<iterator> Queue;
typedef Queue::iterator QueueIt;

enum QueueType {
  QUEUE_UNSOLICITED,
  QUEUE_STALE,
  QUEUE_FIFO,
  QUEUE_MAX
};

struct EntryInfo
{
  QueueType queueType;
  QueueIt queueIt;
  scheduler::EventId moveStaleEventId;
};

struct EntryItComparator
{
  bool
  operator()(const iterator& a, const iterator& b) const
  {
    return *a < *b;
  }
};

typedef std::map<iterator, EntryInfo*, EntryItComparator> EntryInfoMapFifo;

class PriorityFifoPolicy : public Policy
{
public:
  PriorityFifoPolicy();

  virtual
  ~PriorityFifoPolicy();

public:
  static const std::string POLICY_NAME;

private:
  virtual void
  doAfterInsert(iterator i) DECL_OVERRIDE;

  virtual void
  doAfterRefresh(iterator i) DECL_OVERRIDE;

  virtual void
  doBeforeErase(iterator i) DECL_OVERRIDE;

  virtual void
  doBeforeUse(iterator i) DECL_OVERRIDE;

  virtual void
  evictEntries() DECL_OVERRIDE;

private:
  void
  evictOne();

  void
  attachQueue(iterator i);

  void
  detachQueue(iterator i);

  void
  moveToStaleQueue(iterator i);

private:
  Queue m_queues[QUEUE_MAX];
  EntryInfoMapFifo m_entryInfoMap;
};

} // namespace priorityfifo

using priority_fifo::PriorityFifoPolicy;

} // namespace cs
} // namespace nfd

#endif // NFD_DAEMON_TABLE_CS_POLICY_FIFO_HPP