scheduler.hpp

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

#include "../common.hpp"
#include "monotonic_deadline_timer.hpp"

namespace ndn {

struct EventIdImpl; 

typedef shared_ptr<EventIdImpl> EventId;

class Scheduler
{
public:
  typedef function<void()> Event;

  Scheduler(boost::asio::io_service& ioService);

  EventId
  scheduleEvent(const time::nanoseconds& after, const Event& event);

  EventId
  schedulePeriodicEvent(const time::nanoseconds& after,
                        const time::nanoseconds& period,
                        const Event& event);
  
  void
  cancelEvent(const EventId& eventId);

private:
  void
  onEvent(const boost::system::error_code& code);
  
private:
  struct EventInfo
  {
    EventInfo(const time::nanoseconds& after,
              const time::nanoseconds& period,
              const Event& event);

    EventInfo(const time::steady_clock::TimePoint& when, const EventInfo& previousEvent);

    bool
    operator <=(const EventInfo& other) const
    {
      return this->m_scheduledTime <= other.m_scheduledTime;
    }

    bool
    operator <(const EventInfo& other) const
    {
      return this->m_scheduledTime < other.m_scheduledTime;
    }

    time::nanoseconds
    expiresFromNow() const;
    
    time::steady_clock::TimePoint m_scheduledTime;
    time::nanoseconds m_period;
    Event m_event;
    mutable EventId m_eventId;
  };

  typedef std::multiset<EventInfo> EventQueue;
  friend struct EventIdImpl;

  EventQueue m_events;
  EventQueue::iterator m_scheduledEvent;
  monotonic_deadline_timer m_deadlineTimer;

  bool m_isEventExecuting;
};

} // namespace ndn

#endif // NDN_UTIL_SCHEDULER_HPP