A Functional Pattern System for Object-Oriented Design

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1、AFunctionalPatternSystemforObject-OrientedDesignThomasK¨uhne}Achilddoesnotdis-covertheworldbylearningabstractrules.Insteaditlearnsbylookingatconcreteexamples.Anexamplecontainstherulesaswell.Incontrasttorules,therecognitionofexamplescanbebasedontangiblereality.Theknowledgeextractedfromanexampleserv

2、esasaPatternthatisusedtorememberfactsandtoconstructnewsolutions.Whengrown-upsareabouttolearnsomethingorhavetoapplyunknowntools,theyareputintoachild'spositionagain.Theywillfavorconcreteexamplesoverabstractrules.Theruleswillhappilybegen-eratedautomatically,forthisishowthebrainworks.}ThesisiiiThesisD

3、esignpatternsinspiredbyfunctionalprogrammingconceptscanadvanceobject-orienteddesign.ProblemTheobject-orientedparadigmhasundoubtfullyraisedourabilitytodesignandmaintainlargecomplexsoftwaresystems.However,itdoesnotseemtohavemeetthehighexpectationsconcerningreuseandeaseofevolutionwhichhavebeenpro-mot

4、edeversinceitscommercialsuccess.Therearemanypotentialreasonsfortheaboveobservationsuchasunquali-fiedstaff,immaturelanguages,inadequatemethodologies,inappropriatebusinessprocesses,etc.Theviewpresentedhereisthatalthoughtheobject-orientedparadigmisapow-erfulbasis,itisincompleteinitsinherentconceptsand

5、thereforerestrictsthedesignspacetoinappropriatesolutions.Itisassumedthatbothsoftwaredevelopmentandlanguagedesignarerestrainedfromachievingtheirfullpotentialwhenrestrictedtoapurelyobject-orientedworldview.SolutionSincethecomplementaryparadigmtoobject-orientationisrepresentedbyfunc-tionalprogramming

6、,Iinvestigatehigh-level,well-knowntoworkfunctionalcon-ceptsandexaminetheirsuitabilitytoenhanceobject-orienteddesign.Iexplorethesoftwareengineeringrelevanceofeachconceptandpresentitsintent,applicability,implementation,andconsequencesintheliterateformofadesignpattern.Myapproachclearlymotivatesfuncti

7、onaltechniquesforobject-orienteddesignfromasoftwareengineeringpointofview.Thisisdifferenttotheusualprocedureofdesigninganewlanguagewithan“ad-hoc”conglomerationoffunctionalandobject-orientedfeatures.Thelattercaser