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

/*

 * Copyright 2007 University of Washington

 * 

 * 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

 */

#include "ns3/log.h"

#include "ns3/ipv4-address.h"

#include "ns3/nstime.h"

#include "ns3/inet-socket-address.h"

#include "ns3/socket.h"

#include "ns3/simulator.h"

#include "ns3/socket-factory.h"

#include "ns3/packet.h"

#include "ns3/uinteger.h"

#include "udp-echo-client.h"

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("UdpEchoClientApplication");

NS_OBJECT_ENSURE_REGISTERED (UdpEchoClient);

TypeId

UdpEchoClient::GetTypeId (void)

{

    .SetParent<Application> ()

    .AddConstructor<UdpEchoClient> ()

    .AddAttribute ("MaxPackets", "XXX",

                   Uinteger (100),

                   MakeUintegerAccessor (&UdpEchoClient::m_count),

                   MakeUintegerChecker<uint32_t> ())

    .AddAttribute ("Interval", "XXX",

                   Seconds (1.0),

                   MakeTimeAccessor (&UdpEchoClient::m_interval),

                   MakeTimeChecker ())

    .AddAttribute ("RemoteIpv4", "XXX",

                   Ipv4Address (),

                   MakeIpv4AddressAccessor (&UdpEchoClient::m_peerAddress),

                   MakeIpv4AddressChecker ())

    .AddAttribute ("RemotePort", "XXX",

                   Uinteger (0),

                   MakeUintegerAccessor (&UdpEchoClient::m_peerPort),

                   MakeUintegerChecker<uint16_t> ())

    .AddAttribute ("PacketSize", "Size of packets generated",

                   Uinteger (100),

                   MakeUintegerAccessor (&UdpEchoClient::m_size),

                   MakeUintegerChecker<uint32_t> ())

    ;

  return tid;

}

UdpEchoClient::UdpEchoClient ()

{

  NS_LOG_FUNCTION;

  m_sent = 0;

  m_socket = 0;

  m_sendEvent = EventId ();

}

UdpEchoClient::~UdpEchoClient()

{

  NS_LOG_FUNCTION;

}

void

UdpEchoClient::DoDispose (void)

{

  NS_LOG_FUNCTION;

  Application::DoDispose ();

}

void 

UdpEchoClient::StartApplication (void)

{

  NS_LOG_FUNCTION;

  if (!m_socket)

    {

      Ptr<SocketFactory> socketFactory = 

        GetNode ()->GetObject<SocketFactory> (tid);

      m_socket = socketFactory->CreateSocket ();

      m_socket->Bind ();

      m_socket->Connect (InetSocketAddress (m_peerAddress, m_peerPort));

    }

  m_socket->SetRecvCallback(MakeCallback(&UdpEchoClient::Receive, this));

  ScheduleTransmit (Seconds(0.));

}

void 

UdpEchoClient::StopApplication ()

{

  NS_LOG_FUNCTION;

  if (!m_socket) 

    {

      m_socket->SetRecvCallback(MakeNullCallback<void, Ptr<Socket>, Ptr<Packet>,

                                const Address &> ());

    }

  Simulator::Cancel(m_sendEvent);

}

void 

UdpEchoClient::ScheduleTransmit (Time dt)

{

  NS_LOG_FUNCTION;

  m_sendEvent = Simulator::Schedule(dt, &UdpEchoClient::Send, this);

}

void 

UdpEchoClient::Send (void)

{

  NS_LOG_FUNCTION;

  NS_ASSERT (m_sendEvent.IsExpired ());

  Ptr<Packet> p = Create<Packet> (m_size);

  m_socket->Send (p);

  ++m_sent;

  NS_LOG_INFO ("Sent " << m_size << " bytes to " << m_peerAddress);

  if (m_sent < m_count) 

    {

      ScheduleTransmit (m_interval);

    }

}

void

UdpEchoClient::Receive(

  Ptr<Socket> socket, 

  Ptr<Packet> packet,

  const Address &from) 

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAMS (this << socket << packet << from);

  if (InetSocketAddress::IsMatchingType (from))

    {

      InetSocketAddress address = InetSocketAddress::ConvertFrom (from);

      NS_LOG_INFO ("Received " << packet->GetSize() << " bytes from " << 

        address.GetIpv4());

    }

}

} // Namespace ns3