/* -*- 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 "udp-echo-client.h"

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("UdpEchoClientApplication");

UdpEchoClient::UdpEchoClient (

  Ptr<Node> n,

  Ipv4Address serverAddress,

  uint16_t serverPort,

  uint32_t count,

  Time interval,

  uint32_t size)

: 

  Application(n)

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << n << ", " << serverAddress <<

    ", " << serverPort << ", " << count << ", " << interval <<

    ", " << size << ")");

  Construct (n, serverAddress, serverPort, count, interval, size);

}

UdpEchoClient::~UdpEchoClient()

{

  NS_LOG_FUNCTION;

}

void

UdpEchoClient::Construct (

  Ptr<Node> n,

  Ipv4Address serverAddress,

  uint16_t serverPort,

  uint32_t count,

  Time interval,

  uint32_t size)

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << n << ", " << serverAddress <<

    ", " << serverPort << ", " << count << ", " << interval <<

    ", " << size << ")");

  m_node = n;

  m_serverAddress = serverAddress;

  m_serverPort = serverPort;

  m_count = count;

  m_interval = interval;

  m_size = size;

  m_sent = 0;

  m_socket = 0;

  m_peer = InetSocketAddress (serverAddress, serverPort);

  m_sendEvent = EventId ();

}

void

UdpEchoClient::DoDispose (void)

{

  NS_LOG_FUNCTION;

  Application::DoDispose ();

}

void 

UdpEchoClient::StartApplication (void)

{

  NS_LOG_FUNCTION;

  if (!m_socket)

    {

      InterfaceId iid = InterfaceId::LookupByName ("Udp");

      Ptr<SocketFactory> socketFactory = 

        GetNode ()->QueryInterface<SocketFactory> (iid);

      m_socket = socketFactory->CreateSocket ();

      m_socket->Bind ();

      m_socket->Connect (m_peer);

    }

  m_socket->SetRecvCallback((Callback<void, Ptr<Socket>, const Packet &,

    const Address &>) MakeCallback(&UdpEchoClient::Receive, this));

  ScheduleTransmit (Seconds(0.));

}

void 

UdpEchoClient::StopApplication ()

{

  NS_LOG_FUNCTION;

  if (!m_socket) 

    {

      m_socket->SetRecvCallback((Callback<void, Ptr<Socket>, const Packet &,

        const Address &>) NULL);

    }

  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 ());

  Packet p (m_size);

  m_socket->Send (p);

  ++m_sent;

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

  if (m_sent < m_count) 

    {

      ScheduleTransmit (m_interval);

    }

}

void

UdpEchoClient::Receive(

  Ptr<Socket> socket, 

  const Packet &packet,

  const Address &from) 

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << socket << ", " << packet << ", " << from << ")");

  if (InetSocketAddress::IsMatchingType (from))

    {

      InetSocketAddress address = InetSocketAddress::ConvertFrom (from);

      NS_LOG_INFO ("Received " << packet.GetSize() << " bytes from " << 

        address.GetIpv4());

    }

}

} // Namespace ns3