application.cpp

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  this->consumer_ = proxy._retn ();
  this->consumer_proxy_disconnect_.set_command (new_proxy_disconnect);
}

void
Heartbeat_Application::connect_as_consumer (ACE_ENV_SINGLE_ARG_DECL)
{
  // Activate with poa.
  RtecEventComm::PushConsumer_var consumer_ref;
  PortableServer::POA_var poa = this->_default_POA ();

  TAO_EC_Object_Deactivator deactivator;
  activate (consumer_ref,
            poa.in (),
            this,
            deactivator
            ACE_ENV_ARG_PARAMETER);
  ACE_CHECK;

  // Obtain reference to ConsumerAdmin.
  RtecEventChannelAdmin::ConsumerAdmin_var consumer_admin =
    this->ec_->for_consumers (ACE_ENV_SINGLE_ARG_PARAMETER);
  ACE_CHECK;

  // Obtain ProxyPushSupplier..
  RtecEventChannelAdmin::ProxyPushSupplier_var proxy =
    consumer_admin->obtain_push_supplier (ACE_ENV_SINGLE_ARG_PARAMETER);
  ACE_CHECK;
  Supplier_Proxy_Disconnect new_proxy_disconnect (proxy.in ());

  // Connect this consumer.
  ACE_ConsumerQOS_Factory qos;
  qos.start_disjunction_group (1);
  qos.insert_type (ACE_ES_EVENT_ANY, 0);
  proxy->connect_push_consumer (consumer_ref.in (),
                                qos.get_ConsumerQOS ()
                                ACE_ENV_ARG_PARAMETER);
  ACE_CHECK;

  // Update resource managers.
  this->supplier_proxy_disconnect_.set_command (new_proxy_disconnect);
  this->set_deactivator (deactivator);
}

int
Heartbeat_Application::handle_timeout (const ACE_Time_Value&,
                                       const void*)
{
  ACE_TRY_NEW_ENV
    {
      if (this->n_timeouts_++ < HEARTBEATS_TO_SEND)
        {
          RtecEventComm::EventSet events (1);
          events.length (1);
          // Events travelling through gateways must have a ttl count of at
          // least 1!
          events[0].header.ttl = 1;
          events[0].header.type = HEARTBEAT;
          events[0].header.source = SOURCE_ID;

          // Store our hostname and process id in the data portion of
          // the event.
          events[0].data.payload.replace (MAXHOSTNAMELEN+11,
                                          MAXHOSTNAMELEN+11,
                                          (u_char *)this->hostname_and_pid_,
                                          0);

          this->consumer_->push (events ACE_ENV_ARG_PARAMETER);
          ACE_TRY_CHECK;
        }
      else
        // We already sent the required number of heartbeats.  Time to
        // shutdown this app.
        {
          this->shutdown ();
        }
    }
  ACE_CATCHANY
    {
      ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION,
                           "Suppressed the following exception in "
                           "Heartbeat_Application::handle_timeout:\n");
    }
  ACE_ENDTRY;
  return 0;
}

void
Heartbeat_Application::push (const RtecEventComm::EventSet &events
                             ACE_ENV_ARG_DECL_NOT_USED)
  ACE_THROW_SPEC((CORBA::SystemException))
{
  for (CORBA::ULong i = 0; i < events.length (); ++i)
    {
      // Figure out heartbeat source.
      const u_char * buffer = events[i].data.payload.get_buffer ();
      pid_t pid = *((pid_t*) buffer);
      char * host = (char*) buffer + sizeof (pid);

      // Update heartbeat database.
      int found = 0;
      size_t size = this->heartbeats_.size ();
      for (size_t j = 0; j < size; ++j)
        {
          if (this->heartbeats_[j].pid == pid
              && ACE_OS::strcmp (this->heartbeats_[j].hostname, host)
              == 0)
            {
              this->heartbeats_[j].total++;
              found = 1;
              break;
            }
        }
      // Make new entry in the database.
      if (!found)
        {
          if (this->heartbeats_.size (size + 1)
              == -1)
            {
              ACE_ERROR ((LM_ERROR,
                          "Unable to add new entry "
                          "to heartbeat database \n"));
              break;
            }

          this->heartbeats_[size].pid = pid;
          this->heartbeats_[size].total = 1;
          ACE_OS::memcpy (this->heartbeats_[size].hostname,
                          host,
                          ACE_OS::strlen (host) + 1);
        }
    }
}

void
Heartbeat_Application::disconnect_push_consumer (ACE_ENV_SINGLE_ARG_DECL_NOT_USED)
  ACE_THROW_SPEC((CORBA::SystemException))
{
  this->shutdown ();
}

void
Heartbeat_Application::destroy_ec (void)
{
  if (!CORBA::is_nil (this->ec_.in ()))
    {
      ACE_TRY_NEW_ENV
        {
          this->ec_->destroy (ACE_ENV_SINGLE_ARG_PARAMETER);
          ACE_TRY_CHECK;
        }
      ACE_CATCHANY
        {
          ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION,
                               "Suppressed the following exception in "
                               "Application_Heartbeat::destroy_ec\n");
        }
      ACE_ENDTRY;

      this->ec_ = RtecEventChannelAdmin::EventChannel::_nil ();
    }
}
void
Heartbeat_Application::shutdown (void)
{
  if (!this->initialized_)
    return;

  this->initialized_ = 0;

  // Deregister from Reactor.
  this->stop_timeouts ();

  // Disconnect from ECs as a consumer.
  this->supplier_proxy_disconnect_.execute ();
  // Disconnect from EC as a supplier.
  this->consumer_proxy_disconnect_.execute ();

  if (destroy_ec_flag)
    {
      this->destroy_ec ();
    }

  // Deregister from POA.
  this->deactivator_.deactivate ();

  // Print out heartbeats report.
  pid_t pid = ACE_OS::getpid ();
  char hostname[MAXHOSTNAMELEN + 1];
  if (gethostname (hostname, MAXHOSTNAMELEN) != 0)
    {
      ACE_ERROR ((LM_ERROR,
                  "Heartbeat_Application::shutdown - "
                  "cannot get hostname\n"));
      hostname[0] = '\0';
    }
  ACE_DEBUG ((LM_DEBUG,
              "%d@%s Received following heartbeats:\n",
              pid, hostname));
  for (size_t i = 0; i < this->heartbeats_.size (); ++i)
    {
      ACE_DEBUG ((LM_DEBUG,
                  "Host %s, pid %d - total of %u\n",
                  this->heartbeats_[i].hostname,
                  this->heartbeats_[i].pid,
                  this->heartbeats_[i].total));
    }

  // Shutdown the ORB.
  ACE_TRY_NEW_ENV
    {
      this->orb_->shutdown (0 ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
    }
  ACE_CATCHANY
    {
      ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION,
                           "The following exception occured in "
                           "Heartbeat_Application::shutdown:\n");
    }
  ACE_ENDTRY;
}

////////////////////////////////////////////////////////////
int
check_for_nil (CORBA::Object_ptr obj, const char *message)
{
  if (CORBA::is_nil (obj))
    ACE_ERROR_RETURN ((LM_ERROR,
                       "ERROR: Object reference <%s> is nil\n",
                       message),
                      -1);
  else
    return 0;
}

int
parse_args (int argc, char ** argv)
{
  ACE_Get_Opt get_opt (argc, argv, "d");
  int opt;

  while ((opt = get_opt ()) != EOF)
    {
      switch (opt)
        {
        case 'd':
          destroy_ec_flag = 1;
          break;

        case '?':
        default:
          ACE_DEBUG ((LM_DEBUG,
                      "Usage: %s "
                      "-d"
                      "\n",
                      argv[0]));
          return -1;
        }
    }

  return 0;
}

int
main (int argc, char *argv[])
{
  // We may want this to be alive beyond the next block.
  TAO_EC_Servant_Var<Heartbeat_Application> app;

  ACE_TRY_NEW_ENV
    {
      // Initialize ORB and POA, POA Manager, parse args.
      CORBA::ORB_var orb =
        CORBA::ORB_init (argc, argv, "" ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;

      if (parse_args (argc, argv) == -1)
        return 1;

      CORBA::Object_var obj =
        orb->resolve_initial_references ("RootPOA" ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
      PortableServer::POA_var poa =
        PortableServer::POA::_narrow (obj.in () ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
      if (check_for_nil (poa.in (), "POA") == -1)
        return 1;

      PortableServer::POAManager_var manager =
        poa->the_POAManager (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // Obtain reference to EC.
      obj = orb->resolve_initial_references ("Event_Service" ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
      RtecEventChannelAdmin::EventChannel_var ec =
        RtecEventChannelAdmin::EventChannel::_narrow (obj.in ()
                                                      ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
      if (check_for_nil (ec.in (), "EC") == -1)
        return 1;

      // Init our application.
      app = new Heartbeat_Application;
      if (!app.in ())
        return 1;

      app->init (orb, ec ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // Allow processing of CORBA requests.
      manager->activate (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // Receive events from EC.
      orb->run (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;
    }
  ACE_CATCHANY
    {
      ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION,
                           "Exception in Heartbeat Application:");
      // Since there was an exception, application might not have had
      // a chance to shutdown.
      app->shutdown ();
      return 1;
    }
  ACE_ENDTRY;

  return 0;
}