TAO/orbsvcs/examples/RtEC/Simple/Consumer.cpp

   1 #include "Consumer.h"
   2 #include "orbsvcs/RtecEventChannelAdminC.h"
   3 #include "orbsvcs/Event_Service_Constants.h"
   4 #include "orbsvcs/CosNamingC.h"
   5
   6 int
   7 ACE_TMAIN(int argc, ACE_TCHAR *argv[])
   8 {
   9   Consumer consumer;
  10
  11   return consumer.run (argc, argv);
  12 }
  13
  14 // ****************************************************************
  15
  16 Consumer::Consumer ()
  17   : event_count_ (0)
  18 {
  19 }
  20
  21 int
  22 Consumer::run (int argc, ACE_TCHAR* argv[])
  23 {
  24   try
  25     {
  26       // ORB initialization boiler plate...
  27       CORBA::ORB_var orb =
  28         CORBA::ORB_init (argc, argv);
  29
  30       // Do *NOT* make a copy because we don't want the ORB to outlive
  31       // the run() method.
  32       this->orb_ = orb.in ();
  33
  34       CORBA::Object_var object =
  35         orb->resolve_initial_references ("RootPOA");
  36       PortableServer::POA_var poa =
  37         PortableServer::POA::_narrow (object.in ());
  38       PortableServer::POAManager_var poa_manager =
  39         poa->the_POAManager ();
  40       poa_manager->activate ();
  41
  42       // Obtain the event channel from the naming service
  43       CORBA::Object_var naming_obj =
  44         orb->resolve_initial_references ("NameService");
  45
  46       if (CORBA::is_nil (naming_obj.in ()))
  47         ACE_ERROR_RETURN ((LM_ERROR,
  48                            " (%P|%t) Unable to get the Naming Service.\n"),
  49                           1);
  50
  51       CosNaming::NamingContext_var naming_context =
  52         CosNaming::NamingContext::_narrow (naming_obj.in ());
  53
  54       CosNaming::Name name (1);
  55       name.length (1);
  56       name[0].id = CORBA::string_dup ("EventService");
  57
  58       CORBA::Object_var ec_obj =
  59         naming_context->resolve (name);
  60
  61       RtecEventChannelAdmin::EventChannel_var event_channel =
  62         RtecEventChannelAdmin::EventChannel::_narrow (ec_obj.in ());
  63
  64       // The canonical protocol to connect to the EC
  65       RtecEventChannelAdmin::ConsumerAdmin_var consumer_admin =
  66         event_channel->for_consumers ();
  67
  68       RtecEventChannelAdmin::ProxyPushSupplier_var supplier =
  69         consumer_admin->obtain_push_supplier ();
  70
  71       RtecEventComm::PushConsumer_var consumer =
  72         this->_this ();
  73
  74       // Simple subscription, but usually the helper classes in
  75       // $TAO_ROOT/orbsvcs/Event_Utils.h are a better way to do this.
  76       RtecEventChannelAdmin::ConsumerQOS qos;
  77       qos.dependencies.length (2);
  78       RtecEventComm::EventHeader& h0 =
  79         qos.dependencies[0].event.header;
  80       h0.type   = ACE_ES_DISJUNCTION_DESIGNATOR;
  81       h0.source = ACE_ES_EVENT_SOURCE_ANY;
  82
  83       RtecEventComm::EventHeader& h1 =
  84         qos.dependencies[1].event.header;
  85       h1.type   = ACE_ES_EVENT_UNDEFINED; // first free event type
  86       h1.source = ACE_ES_EVENT_SOURCE_ANY;
  87
  88       supplier->connect_push_consumer (consumer.in (), qos);
  89
  90       // Wait for events, using work_pending()/perform_work() may help
  91       // or using another thread, this example is too simple for that.
  92       orb->run ();
  93
  94       // We don't do any cleanup, it is hard to do it after shutdown,
  95       // and would complicate the example; plus it is almost
  96       // impossible to do cleanup after ORB->run() because the POA is
  97       // in the holding state.  Applications should use
  98       // work_pending()/perform_work() to do more interesting stuff.
  99       // Check the supplier for the proper way to do cleanup.
 100     }
 101   catch (const CORBA::Exception& ex)
 102     {
 103       ex._tao_print_exception ("Consumer::run");
 104       return 1;
 105     }
 106   return 0;
 107 }
 108
 109 void
 110 Consumer::push (const RtecEventComm::EventSet& events)
 111 {
 112   if (events.length () == 0)
 113     {
 114       ACE_DEBUG ((LM_DEBUG,
 115                   "Consumer (%P|%t) no events\n"));
 116       return;
 117     }
 118
 119   this->event_count_ += events.length ();
 120   if (this->event_count_ % 100 == 0)
 121     {
 122       ACE_DEBUG ((LM_DEBUG,
 123                   "Consumer (%P|%t): %d events received\n",
 124                   this->event_count_));
 125     }
 126 }
 127
 128 void
 129 Consumer::disconnect_push_consumer ()
 130 {
 131   // In this example we shutdown the ORB when we disconnect from the
 132   // EC (or rather the EC disconnects from us), but this doesn't have
 133   // to be the case....
 134   this->orb_->shutdown (false);
 135 }
 136