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person comes back to life, does the reconstructed person have the same identity as the destroyed person If so, where was that person's identity while the person was destroyed Clearly, the topic of identity has strong metaphysical and religious connotations, so we will not pursue it further here Suffice it to say that object identity is under application control and can therefore mean whatever is most suitable to the application For an outstanding treatment of these and related questions, see [6]
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Technical Problems with move
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Apart from conceptual issues, there are also a number of technical problems with move Because of CORBA's implementation and language transparency, when a client moves an object, the server at the original location and the server at the target location might use different CPU architectures or implementation languages This raises the question of how the object could physically move in this case At the very least, the source and the target server would have to have made prior arrangements for object migration by providing equivalent implementations of the object's behavior that happen to use different platforms and languages This point illustrates that object migration is limited to precise and prearranged circumstances The specification of move requires that the object reference for the moved object remain functional (that is, that it "follow" the object to its new location) As you will see in 14, many ORBs are physically incapable of moving a single object from one location to another without also invalidating the object's reference Even if an ORB supports migration of a single object, the feature presents serious challenges with respect to an ORB's performance and scalability The implication is that move is unimplementable in at least the general case 1254 Interface Granularity Recall from Section 124 that the way to support life cycle operations is to inherit from the LifeCycleObject interface, which provides the copy, move, and remove operations The problem with this design is that if we inherit from LifeCycleObject at all, we inherit all three operations For our thermostats and thermometers, that is bad news, because these devices support neither copy nor move semantics The specification states that if a particular operation, such as copy, does not apply to an object, the operation can raise either the NotCopyable exception or the NO_IMPLEMENT system exception However, why would an object offer an operation if that operation always and unconditionally raises an exception when a client calls it It is far preferable in most cases not to provide the operation in the first place because then type checking can take place at compile time The problem created by LifeCycleObject is that the granularity of the object model is too coarse It would have been better to define three abstract interfaces, such as Removable, Copyable, and Movable, so that applications could use them as mix-in interfaces to compose the required functionality A tempting approach to address the
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deficiency of LifeCycleObject would be to add the three mix-in interfaces to the CosLifeCycle module and to change the definition of LifeCycleObject to inherit from the three mix-ins:
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module CosLifeCycle { // // Hypothetical IDL only!
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interface Removable { void remove() raises(NotRemovable); }; interface Copyable { Copyable copy( in FactoryFinder there, in Criteria the_criteria ) raises( NoFactory, NotCopyable, InvalidCriteria, CannotMeetCriteria ); }; interface Movable { void move( in FactoryFinder there, in Criteria the_criteria ) raises( NoFactory, NotMovable, InvalidCriteria, CannotMeetCriteria ); }; interface LifeCycleObject : Removable, Copyable, Movable { // Empty }; //
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Unfortunately, the CORBA type system does not allow this You cannot make any change to the definition of an existing IDL type even if you were to change its repository ID After an IDL definition is published, it becomes immutable The reason is that any change, no matter how innocuous, can break existing client code For example, if you were to build a client that uses the preceding hypothetical IDL and then were to recompile the client using a different ORB that provided the original version, the code would not compile Because of the lack of a versioning mechanism in CORBA, IDL deficiencies are difficult to address except by creating new definitions in a different module 1255 Should You Use the Life Cycle Service The Life Cycle Service has a number of deficiencies Some of them, such as weak type safety, are a necessary consequence of the service's generality Other deficiencies, such as
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