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// Invoke create_POA to create the Controller child POA PortableServer::POA_var controller_poa = root_poa->create_POA("controller", PortableServer::POAManager:: _nil(), policy_list); // Now create Thermometer and Thermostat POAs as children // of the Controller POA PortableServer::POA_var thermometer_poa = controller_poa->create_POA("thermometer", PortableServer::POAManager::_nil(), policy_list); PortableServer::POA_var thermostat_poa = controller_poa->create_POA("thermostat", PortableServer::POAManager::_nil(), policy_list);
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Creating our POAs in this order can be very helpful at server shutdown time because it ensures that all the Thermometer servants and Thermostat servants are etherealized before the Controller servant This is because child POAs are destroyed before their parent POAs, and, if the child has a ServantActivator, its servants will be etherealized before the parent's servants We modified our Controller_impl to keep track only of asset numbers rather than also keeping track of the Thermometer and Thermostat servants, so this POA hierarchy is no longer as important as it would be for the CCS implementation we show in 10 However, creating our hierarchy in this manner allows us to experiment with the relationships between our Controller, Thermometer, and Thermostat servants without also having to continually modify the POA hierarchy We provide more details concerning application shutdown and servant etherealization in Section 1113 1172 Servant Registration One of the most straightforward ways to activate an object is to use the POA object activation operations With these operations, the application developer explicitly supplies a servant to incarnate the object being activated, and, depending on the POA's IdAssignmentPolicy, either the POA assigns an ObjectId or the application developer supplies one The two activation operations are defined as follows
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module PortableServer { exception ServantAlreadyActive {}; exception ObjectAlreadyActive {}; exception WrongPolicy {}; interface POA { ObjectId activate_object(in Servant p_servant) raises(ServantAlreadyActive, WrongPolicy);
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}; //
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activate_object_with_id( in ObjectId id, in Servant p_servant ) raises( ServantAlreadyActive, ObjectAlreadyActive, WrongPolicy ); //
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You choose either activate_object or activate_object_with_id based on the policies of the target POA The activate_object operation requires the target POA to have an IdAssignmentPolicy value of SYSTEM_ID and a ServantRetentionPolicy value of RETAIN If either of these policies does not have the required value, activate_object raises the WrongPolicy exception The activate_object_with_id operation requires the target POA to have a ServantRetentionPolicy value of RETAIN If the POA does not have the RETAIN value for this policy, activate_object_with_id raises the WrongPolicy exception If the IdUniquenessPolicy of the POA is set to UNIQUE_ID and if the Servant passed as an argument is already in the POA's Active Object Map, both activate_object and activate_object_with_id raise the ServantAlreadyActive exception Because C++ servants are passed into POA operations as ServantBase *, the POA uses pointer comparison to check to see whether a given C++ servant is already in its Active Object Map The following example shows how you would create a servant for the Controller interface for the climate control system First, we define the Controller_impl class
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#include <set> #include "CCSShh" class Controller_impl : public virtual POA_CCS::Controller { public: // CORBA operations virtual CCS::Controller::ThermometerSeq * list() throw(CORBA::SystemException); virtual void find(CCS::Controller::SearchSeq & slist) throw(CORBA::SystemException); virtual void change( const CCS::Controller::Thermostat Seq & tlist, CORBA::Short delta
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) throw( CORBA::SystemException, CCS::Controller::EChange ); // Constructor and destructor Controller_impl(); virtual ~Controller_impl(); // Helper functions to allow thermometers and // thermostats to add themselves to the m_assets set // and to remove themselves again void add_impl(CCS::AssetType anum); void remove_impl(CCS::AssetType anum); CORBA::Boolean exists(CCS::AssetType anum) const; private: // Set type for storing known devices typedef set<CCS::AssetType> AssetSet; // Set of known devices AssetSet m_assets; // copy not supported Controller_impl(const Controller_impl &); void operator=(const Controller_impl &); }; // Helper class for find() operation not shown
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This class definition is a little different from the one we show in Section 10111 Our class uses an STL set type as the m_assets data member to hold all known device asset numbers When created, a Controller_impl instance fills its m_assets set by reading device asset numbers from a file (not shown) Next, we use the Controller_impl servant class to activate a Controller object
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// Create our Controller servant Controller_impl ctrl_servant; // Create our Controller ObjectId PortableServer::ObjectId_var oid = PortableServer::string_to_ObjectId("Controller"); // Activate our Controller poa->activate_object_with_id(oid, &ctrl_servant);
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First, we create the Controller servant We assume that we are creating the Controller_impl instance directly on the stack in our main function, so there is no danger of its going out of scope while the POA is still trying to dispatch to it Next, we create the ObjectId by using the string_to_ObjectId helper function to convert
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