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As you can see, the the_criteria parameter is a sequence of name-value pairs, or CORBA's equivalent of a function with untyped parameters The intent of the_criteria is to supply additional information either to guide the choice of factory by the factory finder or to supply additional parameters to the factory, such as a database name, location, or file name for the copy of an image file We suspend our discussion of copy for the moment and return to it again in Section 125 1243 Moving Objects The move operation has a signature similar to that of the copy operation:
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// interface LifeCycleObject { void move( in FactoryFinder there, in Criteria the_criteria ) raises( NoFactory, NotMovable, InvalidCriteria, CannotMeetCriteria ); // }; //
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The intent of the move operation is to physically move an object from one location to another without invalidating the reference to the moved object The moved object is said to have migrated to the new location for example, from inside one server on one machine to inside another server on a different machine The parameters to the operation are the same as for the copy operation and are meant to provide further information as to where the object should be moved However, the contents and meaning of the parameters are not further specified We suspend our discussion of move for the moment and return to it in Section 125 1244 Generic Factories The Life Cycle Service also defines a GenericFactory interface:
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module CosLifeCycle { // interface GenericFactory { boolean supports(in Key k); Object create_object(in Key k, in Criteria the_criteria) raises(
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NoFactory, InvalidCriteria, CannotMeetCriteria
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The create_object operation can be used to implement a factory that can create any type of object given appropriate parameters We can supply an unlimited amount of information to create_object (because the name-value sequence passed in the_criteria is unbounded) to guide the operation in how to create the new object A likely implementation would be that create_object would not directly create a new object but instead would use the parameters to decide how to delegate the invocation to a more specific factory that actually knows how to create the object Because create_object must be able to return references to arbitrary types of objects, the return type is Object The supports operation should return true if the generic factory could create a new object if passed the same key It returns false otherwise
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125 A Critique of the Life Cycle Service
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It is instructive to examine a few of the design decisions made in the Life Cycle Service and the consequences of these decisions 1251 Generality of Design By necessity, the Life Cycle Service is very general The service must provide IDL interfaces that permit clients to control the life cycle of objects without knowing anything about the types or the semantics of the objects in question The design of the service clearly reflects this requirement for generality For object creation, you can either use the GenericFactory interface or follow one of the factory design patterns discussed in Section 123 If you choose the GenericFactory interface, you must supply the parameters to the factory as namevalue pairs As you will see in 15, values of type any are extremely flexible and powerful, but they are not nearly as easy to use as strongly typed values are Moreover, even though type any is type-safe at run time, it is by necessity not type-safe at compile time In other words, using type any replaces static compile-time type safety with dynamic run-time type safety As a result, type mismatches are not detected until run time and are detected only if they actually occur (In other words, they are detected only if we happen to have a test case that exposes the type mismatch) Specific create operations, such as the create_thermometer operation you saw in Section 123, do not suffer from these problems The object reference returned from a
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