A Controlled Experiment in Maintenance Comparing Design 在维修比较设计对照实验.pptVIP

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2018-06-24 发布于四川
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A Controlled Experiment in Maintenance Comparing Design 在维修比较设计对照实验.ppt

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A Controlled Experiment in Maintenance Comparing Design 在维修比较设计对照实验

A Controlled Experiment in Maintenance Comparing Design Patterns to Simpler Solutions Fadi (Fadhi) Wedyan CS614 Spring 2007 Presentation Outlines Introduction Objective Experiment setup Experiment Conduction Validity Threads Conclusions and Comments Introduction Design patterns aim to simplify maintenance and increase usability. Design patterns increase flexibility and reduce coupling. Design patterns increases program complexity in the case where the flexibility offered by the pattern is unnecessary. Objective Investigate, with respect to maintenance time, whether it is useful to design programs with design patterns even if the actual problem is simpler than that solved by the design pattern. Is the complexity introduced by the design pattern always justified? Experiment Setup Four different programs, well-documented, written for the purpose of the experiment. Two versions of each program are developed: Pattern version (PAT) and Alternative version (ALT). Implementation in C++. Patterns implemented : ABSTRACT, FACTORY, COMPSITE, DECORATOR, FA?ADE, OBSERVER, and VISITOR. Experiment Setup, Cont’d In each program, at least one of flexibility functionality offered by the design patterns is not needed by the maintenance tasks. 29 subjects are used, all professional SE. - Some of them have theoretical or practical pattern knowledge. - Subjects are distributed into four balanced groups. Experiment Setup, Cont’d Three Independent variables: Programs and maintenance tasks. Program version. Amount of pattern knowledge. Two dependent variables: Time. Correctness. Experiment Setup, Cont’d Experiment Conduction First Problem: Stock Ticker (ST) Directs stocks to one or more displays. Patterns: OBSERVER Task 1: activate the second display unit. Expectations: E1: PRE-PAT Subjects require more time (supported) E2: POST-PAT Subjects require less time. (Not Supported). Conclusion: OBSERVER may be harmful! First Problem: Stock Ticker (ST), Cont’d Task 2: Allow program to add n