C++ Consumer::connect方法代码示例

//.........这里部分代码省略.........

      // The multicast Event Handler needs to know to what multicast
      // groups it should listen to.  To do so it becomes an observer
      // with the event channel, to determine the list of events
      // required by all the local consumer.
      // Then it register for the multicast groups that carry those
      // events:
      mcast_eh.open (event_channel.in ());

      // Again the receiver connects to the event channel as a
      // supplier of events, using the Observer features to detect
      // local consumers and their interests:
      receiver->init (event_channel.in (),
                      endpoint,
                      address_server.in ());

      // The Receiver is also a supplier of events.  The exact type of
      // events is only known to the application, because it depends
      // on the traffic carried by all the multicast groups that the
      // different event handlers subscribe to.
      // In this example we choose to simply describe our publications
      // using wilcards, any event from any source.  More advanced
      // application could use the Observer features in the event
      // channel to update this information (and reduce the number of
      // multicast groups that each receive subscribes to).
      // In a future version the event channel could perform some of
      // those tasks automatically
      RtecEventChannelAdmin::SupplierQOS pub;
      pub.publications.length (1);
      pub.publications[0].event.header.type   = ACE_ES_EVENT_ANY;
      pub.publications[0].event.header.source = ACE_ES_EVENT_SOURCE_ANY;
      pub.is_gateway = 1;

      receiver->connect (pub);

      // **************** THAT COMPLETES THE FEDERATION SETUP

      // **************** HERE STARTS THE CLIENT SETUP

      // First let us create a consumer and connect it to the event
      // channel
      Consumer consumer (valuetype);
      RtecEventChannelAdmin::ConsumerAdmin_var consumer_admin =
        event_channel->for_consumers ();
      consumer.connect (consumer_admin.in ());

      // **************** THAT COMPLETES THE CLIENT SETUP

      // **************** HERE STARTS THE EVENT LOOP

      // Wait for events, including incoming multicast data.
      // We could also use orb->run(), but that will not let us
      // terminate the application in a nice way.
      for (int i = 0; i != 100; ++i)
        {
          CORBA::Boolean there_is_work =
            orb->work_pending ();
          if (there_is_work)
            {
              // We use a TAO extension. The CORBA mechanism does not
              // provide any decent way to control the duration of
              // perform_work() or work_pending(), so just calling
              // them results in a spin loop.
              ACE_Time_Value tv (0, 50000);
              orb->perform_work (tv);
            }