Mutual Registration
نویسنده
چکیده
Context Many object-oriented designs contain bidirectional relationships between objects, where an instance of one class is linked to an instance of another class and vice-versa. These are normally represented in terms of two unidirectional relationships – conventional programming languages provide unidirectional object pointers or references but rarely support any bidirectional constructs. Problem When a bidirectional relationship is resolved into two unidirectional relationships, the implicit constraint that the relationship between two objects is a single bidirectional link is lost, i.e. if object a points to object b then object b is guaranteed to point back to object a. How can we ensure referential integrity and preserve the relationship's symmetry? Consider the bidirectional relationship between subjects and observers in many implementations of the OBSERVER pattern for one-to-many event notification [Gamma+1995]. In the following simplified structure, a subject exclusively supplies events to many observers, which can only consume events from one subject at a time: This leads to the following C++ code (inlined for brevity) for notification and representation: class subject; class observer { public: a b a b c
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