TAO/orbsvcs/examples/Log/RTEvent/RTEvent_Consumer.cpp

   1 #include "RTEvent_Consumer.h"
   2 #include "orbsvcs/RtecEventChannelAdminC.h"
   3 #include "orbsvcs/Event_Service_Constants.h"
   4 #include "ace/OS_main.h"
   5
   6 #define NAMING_SERVICE_NAME "NameService"
   7 #define EVENT_TLS_LOG_FACTORY_NAME "RTEventLogFactory"
   8
   9 int
  10 ACE_TMAIN (int argc, ACE_TCHAR *argv[])
  11 {
  12   Consumer consumer;
  13
  14   return consumer.run (argc, argv);
  15 }
  16
  17 // ****************************************************************
  18
  19 Consumer::Consumer (void)
  20   : event_count_ (0)
  21 {
  22 }
  23
  24 int
  25 Consumer::run (int argc, ACE_TCHAR* argv[])
  26 {
  27   try
  28     {
  29       // ORB initialization boiler plate...
  30       CORBA::ORB_var orb =
  31         CORBA::ORB_init (argc, argv);
  32
  33       // Do *NOT* make a copy because we don't want the ORB to outlive
  34       // the run() method.
  35       this->orb_ = orb.in ();
  36 /*
  37       if (argc <= 1)
  38         {
  39           ACE_ERROR ((LM_ERROR,
  40                       "Usage: Consumer <event_channel_ior>\n"));
  41           return 1;
  42         }
  43 */
  44       CORBA::Object_var object =
  45         orb->resolve_initial_references ("RootPOA");
  46       PortableServer::POA_var poa =
  47         PortableServer::POA::_narrow (object.in ());
  48       PortableServer::POAManager_var poa_manager =
  49         poa->the_POAManager ();
  50       poa_manager->activate ();
  51
  52       // Obtain the event channel, we could use a naming service, a
  53       // command line argument or resolve_initial_references(), but
  54       // this is simpler...
  55 /*      object =
  56         orb->string_to_object (argv[1]);
  57
  58       RtecEventChannelAdmin::EventChannel_var event_channel =
  59         RtecEventChannelAdmin::EventChannel::_narrow (object.in ());
  60 */
  61
  62      // Obtain the event channel
  63       CORBA::Object_var naming_obj =
  64         this->orb_->resolve_initial_references (NAMING_SERVICE_NAME);
  65
  66       // Need to check return value for errors.
  67       if (CORBA::is_nil (naming_obj.in ()))
  68         throw CORBA::UNKNOWN ();
  69
  70       this->naming_context_ =
  71         CosNaming::NamingContext::_narrow (naming_obj.in ());
  72
  73       CosNaming::Name name (1);
  74       name.length (1);
  75       name[0].id = CORBA::string_dup (EVENT_TLS_LOG_FACTORY_NAME);
  76
  77       CORBA::Object_var obj =
  78         this->naming_context_->resolve (name);
  79
  80       this->event_log_factory_ =
  81         RTEventLogAdmin::EventLogFactory::_narrow (obj.in ());
  82
  83
  84       // The canonical protocol to connect to the EC
  85
  86       this->supplier_ =
  87         this->event_log_factory_->obtain_push_supplier ();
  88
  89       RtecEventComm::PushConsumer_var consumer =
  90         this->_this ();
  91
  92       // Simple subscription, but usually the helper classes in
  93       // $TAO_ROOT/orbsvcs/Event_Utils.h are a better way to do this.
  94       RtecEventChannelAdmin::ConsumerQOS qos;
  95       qos.dependencies.length (2);
  96       RtecEventComm::EventHeader& h0 =
  97         qos.dependencies[0].event.header;
  98       h0.type   = ACE_ES_DISJUNCTION_DESIGNATOR;
  99       h0.source = ACE_ES_EVENT_SOURCE_ANY;
 100
 101       RtecEventComm::EventHeader& h1 =
 102         qos.dependencies[1].event.header;
 103       h1.type   = ACE_ES_EVENT_UNDEFINED; // first free event type
 104       h1.source = ACE_ES_EVENT_SOURCE_ANY;
 105
 106       this->supplier_->connect_push_consumer (consumer.in (), qos);
 107
 108       // Wait for events, using work_pending()/perform_work() may help
 109       // or using another thread, this example is too simple for that.
 110       orb->run ();
 111
 112       // We don't do any cleanup, it is hard to do it after shutdown,
 113       // and would complicate the example; plus it is almost
 114       // impossible to do cleanup after ORB->run() because the POA is
 115       // in the holding state.  Applications should use
 116       // work_pending()/perform_work() to do more interesting stuff.
 117       // Check the supplier for the proper way to do cleanup.
 118     }
 119   catch (const CORBA::Exception& ex)
 120     {
 121       ex._tao_print_exception ("Consumer::run");
 122       return 1;
 123     }
 124   return 0;
 125 }
 126
 127 void
 128 Consumer::push (const RtecEventComm::EventSet& events)
 129 {
 130   ACE_UNUSED_ARG (events);
 131
 132   this->event_count_ ++;
 133
 134       ACE_DEBUG ((LM_DEBUG,
 135                   "Consumer (%P|%t): %d log generated events received\n",
 136                   this->event_count_));
 137 }
 138
 139 void
 140 Consumer::disconnect_push_consumer (void)
 141 {
 142   // In this example we shutdown the ORB when we disconnect from the
 143   // EC (or rather the EC disconnects from us), but this doesn't have
 144   // to be the case....
 145   this->orb_->shutdown (0);
 146 }
 147