E-business第九章—电子商务软件设计模式上海交通大学计算机系吴晨涛wuct@cs.sjtu.edu.cn本章内容只需看上课复习时所提部分2IntroductiontoPatternsUnitObjectivesAftercompletingthisunit,youshouldbeableto:DescribethemostcommonpatternsthatareusedtodevelopWeb-basedapplicationsDifferentiatebetweenthetypesofpatternsthatarepresentedIdentifythetypeofpatternusedtomeetasetofcustomerbusinessrequirementsDescribesomeofthecustompatternsIdentifyhowacustompatternisusedtomeetasetofcustomerbusinessrequirementsDiscusslimitationsandrisksofusingcustompatterns4e-businessSolutionse-businesssolutionsallowanorganizationtoleverageWebtechnologiestoreengineerbusinessprocesses,enhancecommunicationsandlowerorganizationalboundarieswiththeircustomersandshareholders(acrosstheInternet),employeesandstakeholders(acrossthecorporateintranet),anditsvendors,suppliersandpartners(acrossitsextranet).5WhatArePatterns?“Eachpatterndescribesaproblemthatoccursoverandoveragaininourenvironmentandthendescribesthecoreofthesolutiontothatprobleminsuchawaythatyoucanusethissolutionamilliontimesoverwithouteverdoingitthesamewaytwice.”-Dr.ChristopherAlexanderATimelesswayofbuilding6PatternsPatternshelpaddressmanyofthesechallengesrelatedtothesolutiondevelopmentprocess.Itisimportanttorememberthatpatterns:ArenotnewArenotinvented–theyareobservedanddocumentedfromextensiveexperienceHelpshortendevelopmentcyclesHelpleverageknowledgeofexperiencedprofessionalsHelppromotereuseofassets7Patternsfore-businessPatternsfore-business:ProvideasimpleandconsistentwaytotranslatebusinessprioritiesandrequirementsintotechnicalsolutionsAssistandspeedupthesolutiondevelopmentprocessbyfacilitatingtheassemblyofsolutionandminimizingcustomone-of-a-kindimplementationsCapturetheknowledgeandbestpracticesusedbyexpertsandmakeitavailableforusebyjuniortechnologistsFacilitatethereuseofintellectualcapitalsuchasReferenceArchitectures,Frameworksandotherassets8Patternsfore-businessWeintroducefivetypesofPat