Read e-book online Adaptive Object-Oriented Software: The Demeter Method with PDF

By Karl Lieberherr

ISBN-10: 053494602X

ISBN-13: 9780534946029

This groundbreaking ebook offers a whole method for adaptive programming in any object-oriented language. Lieberherr's procedure 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 the next, 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 development" language describes the way to distribute significant tools (including navigation) around the program's constitution. utilizing this system, software program designers can create courses which are simply converted 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

Example text

First we generate a subgraph of the class dictionary graph, denoting the set of collaborating classes speci ed by the structural constraints in the adaptive program. Then, a method is attached to each vertex in the generated subgraph, sharing the signature given by the adaptive program in its behavioral section. Finally, each method speci cation in the behavioral section|class and code fragment|is used to either ll in or annotate some generated method. Consider again the adaptive program for computing salaries of o cers outlined in the previous section, and summarized in Fig.

Object-oriented programmers have to write the details of the class structure repeatedly into their methods. This leads to programs with high entropy that are polluted by accidental details about the class structure. 4 shows a class structure (the full square) and four behaviors which have been written for various parts of the class structure. 3. ADAPTIVE PROGRAMMING 7 and the fourth behavior (f4) uses the top two thirds. The part of the class structure that is in the center is encoded four times into the methods that implement the four behaviors!

O cer salary ;! Salary head Company subsidiaries 2. Conglomerate ;! ;! SubsidiaryList ;! Subsidiary company ;! Company officers ;! O cerList ;! O cer salary ;! Salary The set of paths is restricted to those paths that contain at least one *through* edge and that do not contain any *bypassing* edge. In our example, the path Conglomerate head Company subsidiaries ;! ;! SubsidiaryList ;! Subsidiary company ;! Company officers ;! O cerList salary ;! O cer ;! Salary would be eliminated, since it contains the edge subsidiaries ;!

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Adaptive Object-Oriented Software: The Demeter Method with Propagation Patterns: The Demeter Method with Propagation Patterns by Karl Lieberherr

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