// $Id: Identity_Client.cpp 84563 2009-02-23 08:13:54Z johnnyw $
// ============================================================================
//
// = LIBRARY
//    TAO/examples/Load_Balancing
//
// = FILENAME
//    Identity_Client.cpp
//
// = AUTHOR
//    Marina Spivak <marina@cs.wustl.edu>
//
// ============================================================================

#include "Identity_Client.h"
#include "IdentityC.h"
#include "Load_BalancerC.h"
#include "tao/debug.h"
#include "ace/Get_Opt.h"
#include "ace/High_Res_Timer.h"
#include "ace/Stats.h"

Identity_Client::Identity_Client (void)
  : group_factory_ior_ (0),
    number_of_invocations_ (5),
    use_random_ (0),
    iterations_ (0)
{
}

int
Identity_Client::parse_args (int argc, ACE_TCHAR *argv[])
{
  ACE_Get_Opt get_opts (argc, argv, ACE_TEXT("di:n:k:r"));
  int c;

  while ((c = get_opts ()) != -1)
    switch (c)
      {
      case 'd':  // debug flag.
        TAO_debug_level++;
        break;
      case 'i': // ior of the <Object_Group_Factory> object.
        this->group_factory_ior_ = get_opts.opt_arg ();
        break;
      case 'n': // number of times to make invocation on an <Identity> object.
        this->number_of_invocations_ = ACE_OS::atoi (get_opts.opt_arg ());
        break;
      case 'k':
        this->iterations_ = ACE_OS::atoi (get_opts.opt_arg ());
        break;
      case 'r': // flag signifying to obtain references to <Identity>
                // objects from the random <Object_Group> rather than
                // from the round robin one.
        this->use_random_ = 1;
        break;
      case '?':
      default:
        ACE_ERROR_RETURN ((LM_ERROR,
                           "usage:  %s"
                           " [-d]"
                           " [-i] <Object_Group_Factory_ior>"
                           " [-n] <number_of_invocations>"
                           " [-r]"
                           "\n",
                           argv [0]),
                          -1);
      }

  // Indicates successful parsing of command line.
  return 0;
}

int
Identity_Client::init (int argc, ACE_TCHAR* argv[])
{
  int result;

  try
    {
      result = this->orb_manager_.init (argc, argv);
      if (result == -1)
        return result;

      // Check the non-ORB arguments.
      result = this->parse_args (argc, argv);
      if (result < 0)
        return result;
    }
  catch (const CORBA::Exception& ex)
    {
      ex._tao_print_exception ("Identity_Client::init");
      return -1;
    }

  return 0;
}

int
Identity_Client::run (void)
{
  // Contact the <Object_Group_Factory> to obtain an <Object_Group>.
  CORBA::ORB_var orb = orb_manager_.orb ();
  CORBA::Object_var obj =
    orb->string_to_object (this->group_factory_ior_);

  if (obj.in () == 0)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%N|%l) <ERROR> [Identity_Client::run]\n")
                       ACE_TEXT ("factory_resolve\n")),
                      -1);

  Load_Balancer::Object_Group_Factory_var factory =
    Load_Balancer::Object_Group_Factory::_narrow (obj.in ());

  if (CORBA::is_nil (factory.in ()))
    ACE_ERROR_RETURN ((LM_ERROR,
                       "Identity_Client: problems using the factory ior\n"),
                      -1);

  const char *group_name;
  if (this->use_random_)
    group_name = "Random group";
  else
    group_name = "Round Robin group";

  Load_Balancer::Object_Group_var object_group;

  // We have this for the measurement that was done.
#if defined (DOORS_MEASURE_STATS)

  // Performance measurements start here
  ACE_High_Res_Timer::calibrate ();

  ACE_hrtime_t throughput_base = ACE_OS::gethrtime ();

  ACE_Throughput_Stats throughput;
  ACE_UINT32 gsf = ACE_High_Res_Timer::global_scale_factor ();

  for (int i = 0; i < this->iterations_; i++)
    {
      // Record current time.
      ACE_hrtime_t latency_base = ACE_OS::gethrtime ();

#endif /*TAO_MEASURE_STATS*/
      // Remote call
      object_group =
        factory->resolve (group_name);

      CORBA::String_var iorstring =
        orb->object_to_string (object_group.in ());

      ACE_DEBUG ((LM_DEBUG,
                  "The ior string is %s\n", iorstring.in ()));
#if defined (DOORS_MEASURE_STATS)
      // Grab timestamp again.
      ACE_hrtime_t now = ACE_OS::gethrtime ();

      // Record statistics.
      throughput.sample (now - throughput_base,
                         now - latency_base);

    }

  ACE_OS::printf ("*=*=*=*=Aggregated result *=*=*=*=*=\n");
  throughput.dump_results (ACE_TEXT("Aggregated"), gsf);
#endif /*TAO_MEASURE_STATS */

  if (CORBA::is_nil (object_group.in ()))
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         "(%l|%d)The narrowed object is NUL:"),
                        -1);
    }

  // List <Object_Group>'s id.
  CORBA::String_var id = object_group->id ();
  ACE_DEBUG ((LM_DEBUG, "Object Group's id is: %s\n\n", id.in ()));

  // List all <Object_Group>s members.
  Load_Balancer::Member_ID_List_var id_list =
    object_group->members ();
  ACE_DEBUG ((LM_DEBUG,
              "The group contains %d members:\n",
              id_list->length ()));
  for (CORBA::ULong i = 0; i < id_list->length (); ++i)
    ACE_DEBUG ((LM_DEBUG, "%s\n", static_cast<char const*>(id_list[i])));

  // Perform <number_of_invocations_> method calls on <Identity>
  // objects, which are members of the <Object_Group>.  Before each
  // invocations, we get an <Identity> reference to use for that
  // invocation from our <Object_Group>.
  Identity_var identity_object;
  CORBA::String_var identity;
  CORBA::String_var objref;

  for (size_t ind = 0; ind < this->number_of_invocations_; ++ind)
    {
      objref = object_group->resolve ();

      obj = orb->string_to_object (objref.in ());

      identity_object = Identity::_narrow (obj.in ());

      if (CORBA::is_nil (identity_object.in ()))
        ACE_ERROR_RETURN ((LM_ERROR,
                           "Identity_Client: cannot narrow an object received from"
                           "<Object_Group::resolve> to <Identity>\n"),
                          -1);
      identity_object->get_name (identity.out ());

      ACE_DEBUG ((LM_DEBUG,
                  "Invocation  %s\n",
                  identity.in ()));

    }

  return 0;
}

Identity_Client::~Identity_Client (void)
{
}

int
ACE_TMAIN(int argc, ACE_TCHAR *argv[])
{
  int result = 0;
  Identity_Client client;

  if (client.init (argc, argv) == -1)
    return 1;

  try
    {
      result = client.run ();
    }
  catch (const CORBA::Exception& ex)
    {
      ex._tao_print_exception ("Identity_Client");
      return 1;
    }

  if (result == -1)
    return 1;
  else
    return 0;
}
