Designing for Reuse_ Creating APIs for the Future Presentation 1.pdf

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1、DesigningforReuse:CreatingAPIsfortheFutureMikeAmundsen,Layer7/CA@mamundIntroductionTheChallengeVersioningContentremovedbyauthor’srequestContentremovedbyauthor’srequestDeprecateversionafterayearContentremovedbyauthor’srequestContentremovedbyauthor’srequestTheyreleaseanewversio

2、nevery120daysCurrentlysupporting20+parallelversionsContentremovedbyauthor’srequestContentremovedbyauthor’srequestNobreakingchangesContentremovedbyauthor’srequestToVersionmeans"toturn"There'sanotherwordforbackward-compatibleversioning...Backward-compatibleversioningisessential

3、lycreatingextensionsSo,howdoyouenablebackward-compatibleAPIextensions?I'lltalkabouttwowaystoday...Messages(onthewire)...Implementation(inthecode)MessageDesignExtendingMessagesExtendingMessagesExtendingmessageslet'syoueasilyaddbackward-compatiblechangesStructurevsDataStructure

4、vsDataFocusonpassingdata,notstructureThereareseveralnewformatsdesignedspecificallyforpassingdataontheWebWhat'sthecommonthemeinthesenewdesigns?MessageoverObject"[I]tisfareasiertostandardizerepresentationandrelationtypesthanitistostandardizeobjectsandobject-specificinterfaces."

5、-RoyT.FieldingThemostcommondata-passingformatontheWebis…Themostcommondata-passingformatontheWebis…Becauseitiseasytoextend.MessagedesignisnottheonlyplacetoplanforextensionsImplementationDesignComponent!=ConnectorComponent▪Database▪FileSystem▪MessageQueue▪TransactionManager▪Sou

6、rceCodeComponent==IPComponent==$$$Component==PrivateConnector▪WebServer▪BrowserAgent▪ProxyServer▪SharedCacheConnector==SharedTechConnector==CommodityConnector==PublicKeepConnectorsandComponentsseparatedImplementationStackImplementationStackImplementationStackImplementationSta

7、ckClassScheduleServerEachoftheseimplmentationelementscanbeupdatedindependentlyw/obreakageClientStrategiesMostclientappsareboundtoURIsandtheCRUDpatternURI-StyleClients(CRUD)●HTMLSPAContainerURI-StyleClients(CRUD)●URIs,Objects,andActionsURI-StyleClients(CRUD)●URIs,Objects,andAc

8、tionsURI-StyleClients(CRUD)●URIs,Objects,andActionsURI-StyleClients(