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Both the pull and the try_pull methods access the event queue Invoking front on the queue returns immediately if there are event data already present; otherwise, it blocks waiting for event data to be pushed into the queue Because pull blocks if no event data are available, it performs the blocking by simply invoking the blocking front function on the queue However, try_pull must not block if no event data are available It therefore uses the non-blocking try_pop function to try to retrieve an event from the queue If the queue is not empty, the try_pop function sets its argument to point to the popped event data and returns true; otherwise, it returns false If try_pop returns true, then has_event is true, and the try_pull method inserts the popped event into the CORBA::Any return value and returns Otherwise, has_event is set to reflect the empty queue, so a CORBA::Any containing no value is returned Finally, the set_nominal method of the Thermostat_impl servant class pushes an event onto the PullSupplier_impl servant by invoking its thermostat_changed member function Following is the modified implementation of set_nominal
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CCS::TempType Thermostat_impl:: set_nominal(CCS::TempType new_temp) throw(CORBA::SystemException, CCS::Thermostat::BadTemp) { // Set the desired temperature to new_temp (not shown) // Push our event data into the PullSupplier_impl servant // Assume m_servant points to the PullSupplier_impl instance CCS::Thermostat_var ts = _this(); CORBA::String_var loc = location(); m_servant->thermostat_changed(ts, m_anum, loc, new_temp); return new_temp;
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void PullSupplier_impl:: thermostat_changed( CCS::Thermostat_ptr ts, CCS::AssetType asset_num, const char * location, CCS::TempType temp ) { CCS::TStatEvent * event_data = new CCS::TStatEvent; event_data->ts = CCS::Thermostat::_duplicate(ts); event_data->asset_num = asset_num; event_data->location = location; event_data->temp = temp; m_queuepush(event_data);
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The thermostat_changed function heap-allocates a TStatEvent data structure, fills its fields with the arguments passed to it from Thermostat_impl::set_nominal, and pushes the event data into the queue As this example shows, dealing with the need to buffer events in a pull supplier can be complicated Even though we simplify things by using a thread-safe Queue class to hold unpulled events, this pull supplier example is more complicated than any of the other supplier and consumer examples 2065 Implementing a Pull Consumer Like a push supplier, a pull consumer need not be implemented as a CORBA object Any ordinary C++ class or function can pull events from an event channel Therefore, if we want to have our thermostat monitoring application retrieve events by pulling, we can implement the functionality as part of our windowing event loop The following example shows a simplified event loop that repeatedly checks for thermostat events and for GUI events We assume that neither the check_for_thermostat_event function nor the check_for_gui_event function enters a busy loop or blocks for any considerable amount of time
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// Assume the "channel" variable refers to our event channel CosEventChannelAdmin::ConsumerAdmin_var consumer_admin = channel->for_consumers(); // Obtain a ProxyPullSupplier from the ConsumerAdmin and connect CosEventChannelAdmin::ProxyPullSupplier_var supplier = consumer_admin->obtain_pull_supplier(); supplier->connect_pull_consumer( CosEventComm::PullConsumer::_nil() ); bool done; // Now enter our GUI event loop do { check_for_thermostat_event(supplier); done = check_for_gui_event(); } while (!done);
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First, we call for_consumers on our event channel, which returns a ConsumerAdmin_ptr that we use to invoke the obtain_pull_supplier method We store the object reference returned from obtain_pull_supplier in the supplier variable, which we pass to our event polling function To keep the example simple, we use a C-style function to implement the check_for_thermostat_event helper function, which performs event polling
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void check_for_thermostat_event( CosEventComm::PullSupplier_ptr supplier
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CORBA::Boolean has_event; CORBA::Any_var any = supplier->try_pull(has_event); if (has_event) { CCS::TStatEvent * event_data; if (any >>= event_data) { // Use values from the event data // struct here (not shown) } }
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The check_for_thermostat_event function takes a PullSupplier_ptr as an argument, so we pass our ProxyPullSupplier to it Because ProxyPullSupplier is derived from PullSupplier, automatic widening occurs when we pass the supplier variable to check_for_thermostat_event To avoid blocking our GUI event loop and preventing windowing updates, check_for_thermostat_event always performs a try_pull on the supplier Unlike the pull method, try_pull will not block waiting for an event if none is available After invoking try_pull, we check the value of the has_event Boolean out argument to see whether an event was actually returned If this argument is true, we then attempt to extract a pointer to a CCS::TStatEvent struct from the returned CORBA::Any If this succeeds, our code can access the event data via the extracted structure pointer Otherwise, the event data is not of the type we expect, and we ignore it
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