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// Create empty PolicyList for child POA CORBA::PolicyList policy_list; // Invoke create_POA to create the child PortableServer::POA_var child_poa = root_poa->create_POA("child", PortableServer::POAManager::_nil(), policy_list);
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The first part of this example shows the normal sequence of invocations we make to initialize the ORB and get a reference to the Root POA We then create a CORBA::PolicyList sequence, which, like all sequences, is empty when you se the default constructor Finally, we invoke create_POA on the Root POA, passing the string "child" for the name of the new POA, a nil POAManager reference, and our empty policy list Assuming that a POA named "child" does not already exist as a child of the Root POA, create_POA returns an object reference to our new POA Naturally, create_POA can be invoked on any POA Calling it on a child POA of the Root POA, for example, produces a grandchild of the Root POA In the following example we create a hierarchy of POAs:
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// Set up a nil POAManager reference // to pass to each create_POA call PortableServer::POAManager_var nil_mgr = PortableServer::POAManager::_nil(); // Create POA A, child of the Root POA PortableServer::POA_var poa_A = root_poa->create_POA("A", nil_mgr, policy_list); // Create POA B, child of the Root POA PortableServer::POA_var poa_B = root_poa->create_POA("B", nil_mgr, policy_list); // Create POA C, child of the Root POA PortableServer::POA_var poa_C = root_poa->create_POA("C", nil_mgr, policy_list); // Create POA D, child of POA B PortableServer::POA_var poa_D = poa_B->create_POA("D", nil_mgr, policy_list); // Create POA E, child of POA D PortableServer::POA_var poa_E = poa_D->create_POA("E", nil_mgr, policy_list);
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We first create a nil POAManager reference to pass to each create_POA invocation, and we assume we are passing the same empty policy list we created in the preceding example We then create POAs A, B, and C as children of the Root POA After that we create POA D as a child of POA B, and finally we create POA E as a child of POA D
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This sequence of create_POA invocations results in the POA hierarchy shown in Figure 116
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Figure 116 An example POA hierarchy
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Our example shows the mechanics of creating POAs, but it is somewhat unrealistic in that it does not vary the policies of each POA One of the main reasons that applications create and use multiple POAs is to assign different policies to each one Because the Root POA supports only transient objects, a common policy to apply to a new POA is to give it the PERSISTENT life span policy:
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// Create a PERSISTENT LifespanPolicy object PortableServer::LifespanPolicy_var lifespan = root_poa->create_lifespan_policy(PortableServer::PERSISTENT); // Create PolicyList CORBA::PolicyList policy_list; policy_listlength(1); policy_list[0] = PortableServer::LifespanPolicy::_duplicate(lifespan); // Create the child POA PortableServer::POA_var child = root_poa->create_POA("child", nil_mgr, policy_list); // Destroy our LifespanPolicy object lifespan->destroy();
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We first use the create_lifespan_policy operation of the Root POA to create a LifespanPolicy object, passing PERSISTENT as the value for the policy Remember, any POA can serve as a factory for policy objects, and the created policy objects are in no way tied to the POA that creates them Next, we create a single-element policy list and copy our reference to our LifespanPolicy object into it We then invoke create_POA on the Root POA, passing to it the name of the new POA, our nil POAManager reference from our earlier example, and our policy list containing a reference to our PERSISTENT life span policy object Finally, we invoke destroy on
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our life span policy object because it is no longer needed; the create_POA operation guarantees that it will make a copy of the objects in the policy list if it needs to A newly created POA will therefore not hold references to the policy objects passed into create_POA but will instead refer to the copies Creating POAs with different policies and with combinations of policies is also possible In fact, using some policies automatically limits your choices of the remaining policies because some of them imply the use of others and some of them are mutually exclusive However, before we can describe some of the useful combinations of policies that can be passed to create_POA, we must fully explain an important feature of the PortableServer module: the Servant IDL type
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