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CORBA::Object_var obj = orb->resolve_initial_references("RootPOA"); PortableServer::POA_var root_poa = PortableServer::POA::_narrow(obj); // Install our AdapterActivator ExampleAdapterActivator aa_servant; PortableServer::AdapterActivator_var aa = aa_servant_this(); root_poa->the_activator(aa); // Create POA A PortableServer::POA_var poa_a = root_poa->find_POA("A", 1); // Create POA B PortableServer::POA_var poa_b = root_poa->find_POA("B", 1); // Create POA C PortableServer::POA_var poa_c = root_poa->find_POA("C", 1); // Create POA D PortableServer::POA_var poa_d = poa_b->find_POA("D", 1); // Create POA E PortableServer::POA_var poa_e = poa_d->find_POA("E", 1); // Activate our POAManager PortableServer::POAManager_var mgr = root_poa->the_POAManager(); mgr->activate(); // Let the ORB listen for requests orb->run(); } return 0;
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We initialize the ORB and obtain a reference to the Root POA as usual We then create a servant for the AdapterActivator and implicitly create a transient CORBA object from it After the AdapterActivator is registered with the Root POA, we invoke find_POA for POAs "A", "B", "C", "D", and "E" to force them into existence The second argument to find_POA is a Boolean that tells it to attempt to activate the POA if it is not found We then activate the POAManager of the Root POA, which, because of the work of the ExampleAdapterActivator servant, is also shared by POAs "A", "B", "C", "D", and "E" Finally, we let our ORB run so that it will allow requests into our server Although we did not activate our POAManager until after our POAs had been created, we could have done it beforehand just the same, and the presence of the AdapterActivator would have ensured that any requests for any POA being created were queued until the POA was properly initialized
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This approach to POA creation keeps all your creation code in one spot rather than being scattered about your application It also allows you to easily create POAs explicitly via find_POA or allows them to be created on demand as requests for their objects arrive
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1113 POA Destruction
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Eventually, POAs must be destroyed, usually because of an imminent shutdown of the ORB and the death of the server application process However, POAs are not destroyed only at application shutdown For example, an application that intends to remain alive might keep track of all the objects hosted by a given POA and then destroy that POA after all the objects previously created within it have been destroyed You destroy a POA using the POA::destroy operation Invoking it on a POA also destroys all its descendant POAs Any requests that are already being processed by objects within a POA being destroyed are allowed to complete, and any new requests will cause any parent POA adapter activators to be invoked, if present, or will result in a CORBA::OBJECT_NOT_EXIST exception being raised back to the client
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module PortableServer { interface POA { void destroy(in boolean etherealize_objects, in boolean wait_for_completion); // }; // };
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The etherealize_objects parameter controls whether the POA takes action to also destroy any servants registered with it This parameter is meaningful only if the POA has the RETAIN value for the ServantRetention policy and has a servant manager registered with it If these conditions are true and if etherealize_objects is also true, the POA first effectively destroys itself and then invokes etherealize on the servant manager for each servant registered in its Active Object Map The fact that the POA marks itself as destroyed first is important to ensure that any servants that attempt operations on the POA during their own etherealization receive a CORBA::OBJECT_NOT_EXIST exception wait_for_completion, the second parameter to destroy, determines whether the operation waits for all requests currently in progress to finish If true, it causes destroy to return after waiting for all requests already in progress to complete and for all servants to be etherealized If wait_for_completion is false, the POA and its descendant POAs are simply destroyed, and the operation returns Note that any requests in progress are still allowed to complete and any necessary etherealization of servants is carried out regardless of the value of the wait_for_completion parameter; it controls only whether or not destroy waits for these actions to complete before it returns to the caller
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