summaryrefslogtreecommitdiff
path: root/TAO/orbsvcs/examples/RtEC/Simple/Consumer.cpp
blob: 191503bfb3d93c6601ad6027f1f238e73f98eaed (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
// $Id$

#include "Consumer.h"
#include "orbsvcs/RtecEventChannelAdminC.h"
#include "orbsvcs/Event_Service_Constants.h"

ACE_RCSID(EC_Examples, Consumer, "$Id$")

int
main (int argc, char* argv[])
{
  Consumer consumer;

  return consumer.run (argc, argv);
}

// ****************************************************************

Consumer::Consumer (void)
  : event_count_ (0)
{
}

int
Consumer::run (int argc, char* argv[])
{
  ACE_DECLARE_NEW_CORBA_ENV;
  ACE_TRY
    {
      // ORB initialization boiler plate...
      CORBA::ORB_var orb =
        CORBA::ORB_init (argc, argv, "" ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // Do *NOT* make a copy because we don't want the ORB to outlive
      // the run() method.
      this->orb_ = orb.in ();

      if (argc <= 1)
        {
          ACE_ERROR ((LM_ERROR,
                      "Usage: Consumer <event_channel_ior>\n"));
          return 1;
        }

      CORBA::Object_var object =
        orb->resolve_initial_references ("RootPOA" ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
      PortableServer::POA_var poa =
        PortableServer::POA::_narrow (object.in () ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
      PortableServer::POAManager_var poa_manager =
        poa->the_POAManager (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;
      poa_manager->activate (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // Obtain the event channel, we could use a naming service, a
      // command line argument or resolve_initial_references(), but
      // this is simpler...
      object =
        orb->string_to_object (argv[1] ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;

      RtecEventChannelAdmin::EventChannel_var event_channel =
        RtecEventChannelAdmin::EventChannel::_narrow (object.in ()
                                                      ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // The canonical protocol to connect to the EC
      RtecEventChannelAdmin::ConsumerAdmin_var consumer_admin =
        event_channel->for_consumers (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;

      RtecEventChannelAdmin::ProxyPushSupplier_var supplier =
        consumer_admin->obtain_push_supplier (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;

      RtecEventComm::PushConsumer_var consumer =
        this->_this (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // Simple subscription, but usually the helper classes in
      // $TAO_ROOT/orbsvcs/Event_Utils.h are a better way to do this.
      RtecEventChannelAdmin::ConsumerQOS qos;
      qos.dependencies.length (2);
      RtecEventComm::EventHeader& h0 =
        qos.dependencies[0].event.header;
      h0.type   = ACE_ES_DISJUNCTION_DESIGNATOR;
      h0.source = ACE_ES_EVENT_SOURCE_ANY;

      RtecEventComm::EventHeader& h1 =
        qos.dependencies[1].event.header;
      h1.type   = ACE_ES_EVENT_UNDEFINED; // first free event type
      h1.source = ACE_ES_EVENT_SOURCE_ANY;

      supplier->connect_push_consumer (consumer.in (), qos
                                       ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;

      // Wait for events, using work_pending()/perform_work() may help
      // or using another thread, this example is too simple for that.
      orb->run ();

      // We don't do any cleanup, it is hard to do it after shutdown,
      // and would complicate the example; plus it is almost
      // impossible to do cleanup after ORB->run() because the POA is
      // in the holding state.  Applications should use
      // work_pending()/perform_work() to do more interesting stuff.
      // Check the supplier for the proper way to do cleanup.
    }
  ACE_CATCHANY
    {
      ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION, "Consumer::run");
      return 1;
    }
  ACE_ENDTRY;
  return 0;
}

void
Consumer::push (const RtecEventComm::EventSet& events
                ACE_ENV_ARG_DECL_NOT_USED)
    ACE_THROW_SPEC ((CORBA::SystemException))
{
  if (events.length () == 0)
    {
      ACE_DEBUG ((LM_DEBUG,
                  "Consumer (%P|%t) no events\n"));
      return;
    }

  this->event_count_ += events.length ();
  if (this->event_count_ % 100 == 0)
    {
      ACE_DEBUG ((LM_DEBUG,
                  "Consumer (%P|%t): %d events received\n",
                  this->event_count_));
    }
}

void
Consumer::disconnect_push_consumer (ACE_ENV_SINGLE_ARG_DECL)
    ACE_THROW_SPEC ((CORBA::SystemException))
{
  // In this example we shutdown the ORB when we disconnect from the
  // EC (or rather the EC disconnects from us), but this doesn't have
  // to be the case....
  this->orb_->shutdown (0 ACE_ENV_ARG_PARAMETER);
}

// ****************************************************************

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
#elif defined(ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */