软件设计模式-体系结构-PPT讲稿 0-Software-Design-Patterns-20121030 Lec5_facade-Structural.ppt

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1、Lecture5FacadePattern门面模式(Structural)ContentsofthislectureConceptofthefaçadedesignpatternDesignexampleusingthefaçadepatternPropertiesofthefaçadepatternMoredesignexamplesinthefaçadepatternComparisonoftheexamplesConceptoftheFaçadePatternSec1Company2Company3Company1FacadePatternSec2Sec3Sec4S

2、ec5Sec6SomecompaniesgotogovernmentsectionsforapprovalofdocumentsAlotofinteractionsinvolvedIntroductoryexample1:companiesandgovernmentsectionsSec1Company2Company3Company1Sec2Sec3Sec4Sec5Sec6FacadePatternNowweintroduceareceptionistAcompanycanjustgotothereceptionist,whichinturnwillgototherel

3、atedgovernmentsections接待员ReceptionistFacadePatternIntroductoryExample2:domainprogrammerDBAccessMathtoolGUITOOLSimulationManagementRemoteAccessSecurityAuthentificationAuthorizationControlToolDataCollectionInstrumentSoftwaredeveloperforanElectronicmanagementsystemHeisconfusedbysomanyclasses

4、inthelibrary.Howtosolvethisproblem?Example:domainprogrammerDBAccessMathtoolGUITOOLSimulationManagementRemoteAccessSecurityAuthentificationAuthorizationControlToolDataCollectionInstrumentNow,hecanjustcallthefunctionsprovidedbythefaçadeclass.ElectronicManagementFacadefaçadeclass:providebasi

5、cfunctionsthatareenoughfordomainprogrammerstousebycallingfunctionsfromthepackagesandFacadePatternThisideacanbeusedinsoftwaredevelopmentClass1Class2Class5Class6Class3Class4ClientClassFaçadeClassDiagramofFacadePatternBackDesignExampleUsingtheFaçadePattern【例1】(家庭安全系统)AHomeSecuritySystemHomeh

6、ealthandsecuritysystemisacomprehensivesystem,whichisinchargeoffireprotection,security,healthetc.火灾报告：Whenfireoccurs,thesystemcancallthefirebrigadeautomatically疾病报告：Whenafamilymembergetsacutedisease,thesystemcancallahospitalautomatically抢劫报告：Whenafamilyisrobbed,thesystemcanpromptlyinformap

7、olicestationFacadePatternExistinglibrary.Supposethatthereexistsalibraryforuse,withmanyexistingclassesthatcanbecalledtofulfillthetask.FacadePatternCamera+turnOn:void+turnOff:void+rotate:voidLight+turnOn:void+turnOff:void+changeBulb:voidSmokeSensor+activate:void+deact