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

/*

 * Copyright (c) 2007 INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "watchdog.h"

namespace ns3 {

Watchdog::Watchdog ()

  : m_impl (0),

    m_event (),

    m_end (MicroSeconds (0))

{}

Watchdog::~Watchdog ()

{

  delete m_impl;

}

void 

Watchdog::Ping (Time delay)

{

  Time end = Simulator::Now () + delay;

  m_end = std::max (m_end, end);

  if (m_event.IsRunning ())

    {

      return;

    }

  m_event = Simulator::Schedule (m_end - Now (), &Watchdog::Expire, this);

}

void

Watchdog::Expire (void)

{

  if (m_end == Simulator::Now ())

    {

      m_impl->Invoke ();

    }

  else

    {

      m_event = Simulator::Schedule (m_end - Now (), &Watchdog::Expire, this);

    }

}

} // namespace ns3

#ifdef RUN_SELF_TESTS

#include "ns3/test.h"

namespace ns3 {

class WatchdogTests : public Test

{

public:

  WatchdogTests ();

  virtual bool RunTests (void);

private:

  void Expire (Time expected);

  bool m_error;

};

WatchdogTests::WatchdogTests ()

  : Test ("Watchdog")

{}

void

WatchdogTests::Expire (Time expected)

{

  bool result = true;

  NS_TEST_ASSERT_EQUAL (Simulator::Now (), expected);

  m_error = !result;

}

bool

WatchdogTests::RunTests (void)

{

  bool result = true;

  m_error = false;

  Watchdog watchdog;

  watchdog.SetFunction (&WatchdogTests::Expire, this);

  watchdog.SetArguments (MicroSeconds (40));

  watchdog.Ping (MicroSeconds (10));

  Simulator::Schedule (MicroSeconds (5), &Watchdog::Ping, &watchdog, MicroSeconds (20));

  Simulator::Schedule (MicroSeconds (20), &Watchdog::Ping, &watchdog, MicroSeconds (2));

  Simulator::Schedule (MicroSeconds (23), &Watchdog::Ping, &watchdog, MicroSeconds (17));

  Simulator::Run ();

  NS_TEST_ASSERT (!m_error);

  Simulator::Destroy ();

  return result;

}

static WatchdogTests g_watchdogTests;

} // namespace ns3

#endif /* RUN_SELF_TESTS */