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destroy our policy objects because we no longer need them Note that even though we stored the policy object references in instances of the LifespanPolicy_var and IdAssignmentPolicy_var types for automatic cleanup, we must still explicitly invoke destroy to get rid of them This is because the _var objects clean up only the object references and not the policy objects themselves 1173 Servant Managers For some applications, explicit servant registration is prohibitively expensive; for others, it is virtually impossible These types of applications might contain many thousands of objects, and creating and registering a servant for each one could require too much memory or require too many costly database lookups Alternatively, an application might function as a gateway to another distributed system and thus might have to learn of the presence of objects dynamically When a new object is created in the foreign system, the gateway must instantiate a servant for it on-the-fly In both cases, these applications would prefer to activate objects on demand as requests are actually made on them rather than having to activate them all before the ORB starts listening for requests A POA that has the USE_SERVANT_MANAGER policy value supports these types of applications by allowing them to create servant managers, which actively participate in the process of determining object-to-servant associations A servant manager is a callback object that the application registers with a POA to assist or even replace the function of the POA's own Active Object Map When the POA attempts to determine the servant associated with a given target object, it calls back to the application's servant manager to obtain the servant There are two types of servant managers For a POA with the RETAIN value for the ServantRetention policy, your servant manager object must support the ServantActivator interface For a POA with the NON_RETAIN policy value, your servant manager must support the ServantLocator interface Before we describe these interfaces in detail, we must first show some IDL definitions that support the ServantActivator and ServantLocator interfaces:
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module PortableServer { exception ForwardRequest { Object forward_reference; }; interface ServantManager {}; }; //
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The ForwardRequest exception can be raised by implementations of ServantActivator and ServantLocator to signify that the request should be processed by a different object, perhaps in another server For interoperable applications using IIOP to communicate with remote clients and objects, the ORB turns the ForwardRequest exception into a LOCATION_FORWARD reply status, which directs the requesting ORB to redirect the request to the object denoted by the forward_reference member of the exception See 13 for more details concerning LOCATION_FORWARD The ServantManager interface serves as a base interface for both the ServantActivator and ServantLocator interfaces Its primary purpose is to allow objects that support either of these interfaces to be registered with the POA and to be managed using a single set of operations
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Servant Activators
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The ServantActivator interface supplies the incarnate and etherealize operations:
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module PortableServer { interface ServantActivator : ServantManager { Servant incarnate( in ObjectId oid, in POA adapter ) raises(ForwardRequest); void etherealize( in ObjectId in POA in Servant in boolean in boolean ); oid, adapter, serv, cleanup_in_progress, remaining_activations
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}; }; //
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When a POA with the RETAIN policy value receives a request for a target object, it consults its Active Object Map to see whether a servant is already available for that object If none is found but the application has registered a ServantActivator with the POA, the POA invokes the incarnate operation of the ServantActivator object, passing it both the ObjectId of the target object and a reference to itself The implementation of the incarnate operation either creates a suitable instance of a servant and returns it, raises a system exception, or raises a ForwardRequest exception
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