By Karl Lieberherr
This groundbreaking e-book provides an entire technique for adaptive programming in any object-oriented language. Lieberherr's process presents a brand new method of object-oriented application layout that is going past item encapsulation and hard-coded navigation paths to accomplish extra versatile interactions between gadgets. Designers utilizing this adaptive process paintings at a better, extra schematic point of abstraction to layout software program courses. Graph notation is used to symbolize the category constitution of this system, and a "propagation trend" language describes find out how to distribute significant equipment (including navigation) around the program's constitution. utilizing this system, software program designers can create courses which are simply changed and adaptable as wishes evolve.
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Additional info for Adaptive Object-Oriented Software: The Demeter Method with Propagation Patterns: The Demeter Method with Propagation Patterns
The o cers that work directly for the head company of the conglomerate and not for any of its subsidiaries. In fact, the process of writing an adaptive program can be seen as a process of making assumptions. These assumptions are expressed as constraints in the class structures that customize an adaptive program. Such constraints specify groups of collaborating classes in the customizing class structures. What is important about the computeSalary problem? We assume there is a Conglomerate object that contains somewhere inside of it an O cer object, which contains a Salary object.
7. 5. We give two di erent customizers: Fig. 8, which selects the C++ program in Fig. 9, and Fig. 10, which selects the C++ program in Fig. 11. Structural Constraints Section Variables Constraints Type Value Find all Salary-objects which are contained in O cer objects which are contained in Conglomerate objects Conglomerate but not reachable through the Class Salary subsidiaries relation. 6: Informal description of computeSalary adaptive program Adaptive programming, as would be expected, is realized by delayed binding.
We have already seen an example: the variable TownVariable. A variable can be viewed as a container that can store pointers to objects of some class. For example, SettlementVariable is a variable that can store either a pointer to a village or a town. The invocation SettlementVariable -> determine_neighbors_larger_than(7000) returns a list of settlements that are neighbors of the object to which SettlementVariable points and that count over 7000 inhabitants. How the list is computed is independent of whether a town or village is in the variable.
Adaptive Object-Oriented Software: The Demeter Method with Propagation Patterns: The Demeter Method with Propagation Patterns by Karl Lieberherr