A Decision-Tree Model for Software Evolution Analysis Yuanfang Cai and Sunny Huynh Department of Computer Science Drexel University Philadelphia, PA yfcai, sh84 cs.drexel.edu ABSTRACT A modularization technique, or a refactoring method, benefits a design if the potential changes to the design can be well encapsulated by the technique.. Making Screen both a subject and an observer just requires the 1: specnotifypolicy: push,pull 2: specupdatepolicy: orig,other 3: mappingds: hash,other 4: colorpolicyobserving: orig,other 5: adtobserver: orig,other 6: adtsubject: orig,other 7: point: orig,other 8: line: orig,other 9: screen: orig,other 10: line = orig = adtsubject = orig colorpolicyobserving = orig 11: screen = orig = adtobserver = orig 12: screen = orig = specupdatepolicy = orig 13: adtsubject = orig = mappingds = hash adtobserver = orig specnotifypolicy = push 14: point = orig = adtsubject = orig colorpolicyobserving = orig Figure 1: The FE OO Observer Pattern Screen class extend the abstract subject interface, and respect color observing policy, such as invoking notification function whenever the color changed: screen = orig = adtsubject = orig colorpolicyobserving = orig We augment a CN with a pair-wise relation to model the dominance relations among design decisions.. We derive the Decison Design Decison New Role Assignment OO Observe Position DOO Design DOOrole DOOpos New Role Assignment V0 DAOrole AO DAO Observe Position DAOpos Figure 2: Software Evolution Model 1: specnotifypolicy: push,pull 2: specupdatepolicy: orig,other 3: mappingds: hash,other 4: colorpolicyobserving: orig,other 5: point: orig,other 6: line: orig,other 7: screen: orig,other 8: abstractprotocol: orig,other 9: abstractprotocolimpl: orig,other 10: colorconprotocol: orig,other 11 abstractprotocolimpl = orig = mappingds = hash abstractprotocol = orig specnotifypolicy = push 12: colorconprotocol = orig = colorpolicyobserving = orig 13: color
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