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consumer_admin->obtain_push_supplier(); // Invoke the connect_push_consumer operation, passing // our PushConsumer reference to it supplier->connect_push_consumer(my_consumer);
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To keep things simple, our example registers the push consumer as a transient object under the Root POA using the _this function for implicit activation Naturally, your application may need to use a different POA with different policies for your consumer objects 2064 Implementing a Pull Supplier A pull supplier must support the CosEventComm::PullSupplier interface The implementation of a pull supplier is similar to that of a push consumer because both must be implemented as CORBA objects Following is the definition for our pull supplier
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class PullSupplier_impl : public virtual POA_CosEventComm::PullSupplier { public: PullSupplier_impl(CORBA::ORB_ptr orb); // IDL method functions virtual void disconnect_pull_supplier() throw(CORBA::SystemException); virtual CORBA::Any * pull() throw( CORBA::SystemException, CosEventComm::Disconnected ); virtual CORBA::Any * try_pull(CORBA::Boolean_out has_event) throw( CORBA::SystemException, CosEventComm::Disconnected ); // C++ helper function void thermostat_changed( CCS::Thermostat_ptr CCS::AssetType const char * CCS::TempType );
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ts, asset_num, location, temp
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private: Queue<CCS::TStatEvent *> m_queue; CORBA::ORB_var m_orb; // copy and assignment not supported PullSupplier_impl(const PullSupplier_impl &); void operator=(const PullSupplier_impl &);
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The PullSupplier_impl constructor takes a reference to the ORB, duplicates it, and stores the duplicated reference in the m_orb data member The ORB reference is used by the disconnect_pull_consumer method Our implementation of disconnect_pull_consumer deactivates the target object, effectively destroying the target object We assume that the POA with which the object is registered has the RETAIN and USE_ACTIVE_OBJECT_MAP_ONLY policies This means that our object will not be mistakenly reincarnated by a servant manager Implementing pull and try_pull is somewhat tricky because of event buffering considerations Because there are no standard requirements as to the frequency with which pull consumers will invoke pull or try_pull, a pull supplier must be prepared to store events until they are specifically requested Available storage resources determine the limits for the number of events that a pull supplier can store before it must start discarding unpulled event data When discarding events, pull suppliers also must decide which events can be discarded and which ones should be kept Deciding how to keep the most meaningful events while discarding others depends heavily on both the application and the values of the event data Our pull supplier example makes four simplifying assumptions Our PullSupplier_impl servant is collocated with our Thermostat_impl servant This allows the Thermostat_impl servant to signal changes in thermostat settings directly to the PullSupplier_impl servant by invoking its thermostat_changed C++ member function These invocations are not CORBA operation invocations but instead are ordinary C++ function calls Our PullSupplier_impl servant buffers events using a hypothetical thread-safe C++ Queue template class (not shown) that has the same interface as the STL queue type However, unlike the STL queue, our thread-safe Queue allows us to safely push data into one end and to perform safe, blocking pulls of the data from the other end The Queue also provides a non-blocking thread-safe pull operation We do not implement an algorithm to decide whether and when events should be discarded In other words, the queue is allowed to grow without bound We assume that our POA has the ORB_CTRL_MODEL value for the PortableServer::ThreadingPolicy, thus allowing it to concurrently service requests on multiple objects The constructor and disconnection operation are exactly the same as for the PushConsumer_impl servant shown in Section 2063 The constructor duplicates and stores a reference to the ORB hosting the PullSupplier object The disconnect_pull_supplier operation fetches the POACurrent object from the
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PullSupplier_impl:: PullSupplier_impl( CORBA::ORB_ptr orb ) : m_orb(CORBA::ORB::_duplicate(orb)) { // Intentionally empty } void PullSupplier_impl:: disconnect_pull_supplier() throw(CORBA::SystemException) { CORBA::Object_var obj = m_orb->resolve_initial_references("POACurrent"); PortableServer::Current_var current = PortableServer::Current::_narrow(obj); PortableServer::POA_var poa = current->get_POA(); PortableServer::ObjectId_var oid = current->get_object_id(); poa->deactivate_object(oid); } CORBA::Any * PullSupplier_impl:: pull() throw(CORBA::SystemException, CosEventComm::Disconnected) { // For our Queue, the front() call blocks until a data item // exists at the front of the queue CCS::TStatEvent * event_data = m_queuefront(); m_queuepop(); CORBA::Any_var any = new CORBA::Any; any <= *event_data; delete event_data; } return any_retn();
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CORBA::Any * PullSupplier_impl:: try_pull(CORBA::Boolean & has_event) throw(CORBA::SystemException, CosEventComm::Disconnected) { CORBA::Any_var any = new CORBA::Any; CCS::TStatEvent * event_data; has_event = m_queuetry_pop(event_data); if (has_event) { any <= *event_data; delete event_data; }
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