Implementing Consumers and Suppliers in Software

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206 Implementing Consumers and Suppliers
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Whether you are implementing a supplier or a consumer that pushes or pulls events, the steps you perform to implement and register them are roughly the same The general steps required are as follows Step 1 Implement a servant for your push consumer or pull supplier Both push suppliers and pull consumers are clients, so you do not need to implement servants for those cases Step 2
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Obtain a reference to the event channel This step depends on your CORBA environment, but it is usually done by using the Naming Service or Trading Service to find an event channel object reference Step 3 Get a ConsumerAdmin reference from the EventChannel if you want to register a consumer, or get a SupplierAdminw reference if you want to register a supplier Step 4 Obtain the appropriate proxy object reference for the event model you want to use from the ConsumerAdmin or SupplierAdmin object Step 5 Invoke the appropriate connection operation on the proxy object In the following sections, we show how to implement push and pull flavors of both consumers and suppliers To keep the example code focused on the Event Service, we create all objects as transient objects of the Root POA We also assume that a name binding for our event channel already exists directly in the initial NamingContext returned from ORB::resolve_initial_references The examples we show in the next few sections are based on having the thermostats in the CCS deliver an event whenever their temperature settings are modified The following IDL struct is used to convey event data to all interested consumers
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module CCS { struct TStatEvent { Thermostat ts; AssetType asset_num; LocType location; TempType temp; }; // };
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Whenever any temperature setting of any thermostat in the CCS is modified, the Thermostat_impl servant generates an event The event data in the TStatEvent structure consists of information concerning the affected Thermostat: its object reference, asset number, location, and new temperature setting 2061 Obtaining an EventChannel Reference All examples shown in the following sections are assumed to obtain the event channel object reference as shown here
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int main(int argc, char * argv[]) { // Initialize the ORB CORBA::ORB_var orb = CORBA::ORB_init(argc, argv);
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// Obtain a reference to the root NamingContext CosNaming::NamingContext_var root_nc = resolve_init<CosNaming::NamingContext>(orb, "NameService") ; // Create the Name of the event channel binding CosNaming::Name ec_name; ec_namelength(1); ec_name[0]id = CORBA::string_dup("event_channel"); // Resolve the binding to the event channel object reference CosEventChannelAdmin::EventChannel_var channel = resolve_name<CosEventChannelAdmin::EventChannel>( root_nc, ec_name ); //
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This program segment (which for brevity contains no error handling) first initializes the ORB and uses it to obtain a NamingContext object reference To get the initial NamingContext, we use the resolve_init template function introduced in Section 18141 It creates a name, which it then passes to the resolve_name helper template function (also from Section 18141) The resolve_name function looks up the Naming Service binding for the EventChannel object reference and narrows the result to the EventChannel interface The resulting channel object reference variable is used in the following implementation examples 2062 Implementing a Push Supplier To send an event whenever the temperature setting of a Thermostat is changed, we augment our implementation of the Thermostat::set_nominal operation
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CCS::TempType Thermostat_impl:: set_nominal(CCS::TempType new_temp) throw(CORBA::SystemException, CCS::Thermostat::BadTemp) { // Check that the new temperature is within range, and if // so, set the desired temperature to new_temp (not shown) // Create our event data CCS::TStatEvent event_data; event_datats = _this(); event_dataasset_num = m_anum; event_datalocation = location(); event_datatemp = new_temp; // Insert the event data into an any CORBA::Any any; any <= event_data; // Push the event to the event channel Assume that // the "consumer" variable is a reference to our
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