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Because a ServantActivator is itself an object, you must create and activate it before it can be registered with a POA Here is an example definition of a ServantActivator servant class:
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#include <poaShh> class Controller_impl; class ThermometerActivator_impl : public virtual POA_PortableServer::ServantActivator { public: ThermometerActivator_impl(Controller_impl & ctrl); virtual ~ThermometerActivator_impl() {} virtual PortableServer::Servant incarnate( const PortableServer::ObjectId & oid, PortableServer::POA_ptr poa ) throw( CORBA::SystemException, PortableServer::ForwardRequest ); virtual void etherealize( const PortableServer::ObjectId & oid, PortableServer::POA_ptr poa, PortableServer::Servant serv, CORBA::Boolean cleanup_in_progress, CORBA::Boolean remaining_activations ) throw(CORBA::SystemException); private: Controller_impl & m_ctrl; // copy not supported ThermometerActivator_impl( const ThermometerActivator_impl & t ); void operator=(const ThermometerActivator_impl &t);
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Like any servant class, our ThermometerActivator_impl class derives from its skeleton class, which in this case is the ServantActivator skeleton in the POA_PortableServer namespace It overrides the pure virtual functions it inherits, which represent the operations on the ServantActivator IDL interface Our implementation of the incarnate function must check to see that the device that the target object corresponds to actually exists It does this by invoking the public helper function exists on the Controller_impl The implementation of Controller_impl::exists simply checks for the device asset number in the set of known assets This is necessary because our ICP network does not allow direct probes for devices
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CORBA::Boolean Controller_impl::exists(CCS::AssetType anum) const { return m_assetsfind(anum) != m_assetsend(); }
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If we find the device number in the m_assets set, exists returns true; otherwise, it returns false Our servant activator implementation assumes that object IDs are strings containing the asset numbers of our devices We first attempt to convert the oid argument from an ObjectId to a string using the ObjectId_to_string helper function supplied in the PortableServer namespace This function throws a CORBA::BAD_PARAM exception if the object ID contains any octet values that are illegal string characters Because we know that our object IDs contain only printable characters, we catch that exception and throw a CORBA::OBJECT_NOT_EXIST exception to indicate that the object ID does not represent any known object in this POA Assuming that ObjectId_to_string is successful, we then parse the object ID string using an istrstream to turn the string back into an actual asset number
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PortableServer::Servant ThermometerActivator_impl:: incarnate( const PortableServer::ObjectId & oid, PortableServer::POA_ptr poa ) throw(CORBA::SystemException, PortableServer::ForwardRequest) { // Check to see if the object ID is valid CORBA::String_var oid_string; try { oid_string = PortableServer::ObjectId_to_string(oid); } catch(const CORBA::BAD_PARAM&) { throw CORBA::OBJECT_NOT_EXIST(); } // Get the asset number from the oid_string istrstream istr(oid_stringin()); CCS::AssetType anum; istr >> anum; if (istrfail()) throw CORBA::OBJECT_NOT_EXIST(); // Does the object ID denote one of our assets if (!m_ctrlexists(anum)) throw CORBA::OBJECT_NOT_EXIST(); // Get the model identifier from the device PortableServer::Servant servant = 0; char model[32]; if (ICP_get(anum, "model", model, sizeof(model)) != 0) abort();
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if (strcmp(model, "Sens-A-Temp") == 0) servant = new Thermometer_impl(anum); else servant = new Thermostat_impl(anum); return servant;
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Next, we invoke Controller_impl::exists as described earlier If it returns true, we use the ICP network to determine the model type of the device Depending on the model type, we create either a Thermometer_impl servant or a Thermostat_impl servant Either way, the servant is created on the heap because the POA, which must have the RETAIN policy value for servant activators to work, will keep a pointer to it in its Active Object Map We can eventually invoke delete on the servant when the etherealize function is invoked The etherealize function, which allows applications to clean up their servants, is the opposite of the incarnate function The POA normally invokes etherealize in response to an explicit object deactivation via deactivate_object (even if the servant for that object was not created by the servant activator) or in response to the deactivation or destruction of the POA itself Our implementation of etherealize is very simple, only checking to make sure that the servant is no longer in use before invoking delete on it
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void ThermometerActivator_impl:: etherealize( const PortableServer::ObjectId & oid, PortableServer::POA_ptr poa, PortableServer::Servant servant, CORBA::Boolean cleanup_in_progress, CORBA::Boolean remaining_activations ) throw(CORBA::SystemException) { if (!remaining_activations) delete servant; }
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Alternatively, if our servant uses actual reference counting (such as that provided by the RefCountServantBase mix-in class) and invokes delete on itself when its reference count drops to zero, we can make etherealize call _remove_ref on the servant instead of directly invoking delete Before the POA calls the etherealize function, it removes the Active Object Map entry corresponding to the target object Because a servant can incarnate multiple CORBA objects simultaneously, the remaining_activations argument is true (non-zero) if the servant still incarnates other objects and thus is still present in other Active Object Map entries If remaining_activations is false (zero), we do not drop the servant's reference count; in this way, we keep the servant available for the other
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