在職考研英語作文模板都有哪些

Event-DrivenApplications:WheretheyApplyandHowtheyareBuiltK.ManiChandyCaliforniaInstituteofTechnologymani@SpecialthankstoRoySchulteandDavidLuckham.蒼穹龍騎EDABusinessValueRespondtoevents–threatsandopportunities.TakeAway1:EDACharacteristicsMonitorsandcorrelateseventsoutsideandinsidetheenterprise.NocommunicationIMPLIESrealitymatchesmodel.TakeAway2:You’rereadyforEDAnowYourcompanyisalreadyeventdriven.Youalreadyhavethecomponentsofthearchitectureinyourenterprisestack,andit’scomplementarytoSOA.KeyQuestionforyou:DotheincrementalbenefitsofITforEDAexceeditsincrementalcosts?

OrganismsSenseandRespond:EDAStreamsofdata:sight,sound,touch,smell,tasteCentralnervoussystemdetectstherareeventthatisathreatoranopportunityOrganismrespondsappropriatelytothreatoropportunityToomanyfalsepositives,afalsenegative,ortoomanydelayedorinappropriateresponsesresultsindeathGroupSenseandRespond:EDA

Threeenterprises:lions,hyenas,zebrasCriticalconditions:fuseinformationfrominsideandoutsidetheenterpriseExternalAwareness:QuestionsforyouDoesyourenterprisemonitoritscompetitors?Governmentagencies?Dopeopleinyourenterprisecorrelateinformationfrommultiplesources?e.g.,correlatefloodatasupplier’sfactorywithdeadlinesforcriticalcustomers.RespondingtoUnexpectedSituationsQuestionforyou:Afirehasjustoccurredinafactorythatisgoingtoeffectcustomersseverely.Whichoftwoscenariosrepresentsyourenterprise?TheCEOdoesn’texpectVPMfgtosayanythingunlesstheCEOasks.TheCEOexpectsVPMfgtotelltheCEO.NoCommunication=>Reality=ModelCEOhasanexpectation–amodel–oftheCFO:Nocommunicationimpliesrealitymatchesthemodel.Spaceshuttledirectorhasamodelfortheengineerresponsibleforshuttlefoaminsulation.Nocommunicationimpliesrealitymatchesthemodel.Enterprise-WideSituationalAwarenessMilitarysituationalawarenessHoustonDenverEdmontonLondonSydneyNY,NYCorporatesituationalawarenessTradercockpitRiskmanagerHoustonCorporateVP,riskRiskmanagementcockpitSchedulercockpitTake-AwayPointsEDA:GlobalsituationalawarenessEDA:Respondwhenrealitydeviatesfrommodel.Yourenterpriseis:Alreadyevent-directed.HasthesoftwarecomponentsincludingSOAQuestionforyou:incrementalcostsvs.benefits?4:05PMWhatisEDA?Systemthatmanagesandexecutesrulesoftheform:WHENrealitydeviatessignificantlyfromexpectationsTHENinitiateappropriateresponse.EDACharacteristics

AggregateeventsacrossmultiplesourcesAnalyzeDetecteventsacrossextendedenvironmentinreal-timeSenseInvokedistributedservicesinreal-timeRespondEDA:SoftwareCharacteristicsAsynchronouscoupling.Thetiming,place,andcharacteristicsofthreatsandopportunitiesarenotdeterminedbyyou.Sosensorsareresponsibleforpushinginformation;respondersarenotresponsibleforpullingit.Defensiveprogrammingtotheextreme.Datamaybeunstructuredandinaccurate.Protocolsmaybeunspecified.DefensiveProgrammingtotheExtremeAirlineAAirlineBMonitoring

Oneairlinecanmakefewassumptionsaboutanotherairline.EDAshouldbeveryrobust;oritisverybrittle

TherobustnesscomesatapriceEDAisatthelimitofcoupling“l(fā)ooseness”DefensiveProgrammingtotheExtremeDivisionADivisionBMonitoring

Onedivisioncanmakefewassumptionsaboutanotherdivision.EDAshouldbeveryrobust

TherobustnesscomesatapriceEDAisatthelimitofcoupling“l(fā)ooseness”EDAStructure:Sense,Analyze,RespondDefensivePrograms:Sensors&RespondersPROGRAMOUTWARD-FACINGCOMPONENTSEXTREMELYDEFENSIVELYSENSORSRESPONDERSLessDefensive:EventProcessingNetworkPROGRAMINWARD-FACINGCOMPONENTSLESSDEFENSIVELYCompareEDARequirementswithSOASOA:ComponentsarecollaboratorsAccounting“client”callsa“salespipelineexpectation”methodonasales“service”whichreturnswithareportSOA:TimeofinteractiondeterminedbyclientSOA:Serviceprotocolsandschemasarewelldefined.SOA:Unitsobtainglobalsituationalawarenessbyinvokingmultipleservices.EDA:SoftwareCharacteristics-ReviewAsynchronouscoupling.Thetiming,place,andcharacteristicsofthreatsandopportunitiesarenotdeterminedbyyou.Sosensorsareresponsibleforpushinginformation;respondersarenotresponsibleforpullingit.Defensiveprogrammingtotheextreme.Datamaybeunstructuredandinaccurate.Protocolsmaybeunspecified.Sense–Analyze–Respond.When-Thenrules.AnEvent-DrivenArchitectureDatabaseInteractionDBElectronicMarketsApplicationsMarketInteractionNewsHandlerTickerHandlerStocktickersNewsfeedsApplicationHandlerWhen-ThenRuleMgmtSystemConfigurationMonitoringTextAnalysisParametricAnalysisTimeseriesAnalysisESBWebServiceWebsitesApproximateMatchingAlertEngineEndUsersScreenScrapeHostileWebsitesComplexEventPatternsSchedulerTake-Away2(repeated)Yourenterprisealreadyhasmostofthecomponentsofthearchitecture:EAItools;Messaging,ESBoreventdistributors;Databases;Alertsengines;WebServices;RulesenginesEDAiscompatiblewithandcomplementsSOA.Yourenterpriseisalreadyevent-directed.Yourkeyquestion:Dotheincrementalbenefitsexceedtheincrementalcosts?4:15PMInevitableDown-SidesofEDAEffortrequiredtospecifyandtunerules.Errors:Falsepositives:Responsetonon-event DrowninginEvents:“turnthatdarnthingoff!”Falsenegatives:Non-responsetoeventWhyarethesedown-sidesinevitable?InevitableEDADown-Sides:ErrorsWhen-thenrulesareimperfectlyspecified.Whenclausesevaluatedincorrectlyorlate.Changingrulestoreducefalsepositivesincreasesfalsenegatives(andvice-versa).InevitableEDADown-Sides:DrowninEventsMostresponsesalertpeople.Perception:falsepositivescostmuchlessthanfalsenegatives.Toomanyfalsepositives:“so,turnthatthingoff.”Correctevaluationshouldbebasedontotalcostsofallthefalsepositivesandnegativesovertime.InevitableDown-SidesofEDA:NoRulesPeoplearebusy.Learningtoolsforspecifyingrulestakestime.So,rulesaren’tspecified,orarespecifiedinacursoryfashion.DestroysbusinessvalueofEDA.RuleDevelopmentSolutionsHaveIT(orsomecentralorg.)specifyrules.Doesn’twork.Workwithbusinessuserstospecifyruletemplates;individualsfillintemplates.Haverole-basedrulerepositories.IsAnythingMissinginyourSoftwareStack?EventProcessAgentsMachinecan“l(fā)earn”thecriticalconditionfrompositiveandnegativeexamplesUserscanspecifycriticalconditionsSQL-likequeriesFuzzymatchesStatisticaloperatorsRegularexpressionsCEPEstimatingPerformanceRequirementsDelayfromoccurrenceofconditiontoinitiationofresponse:Minutes?Sub-seconds?Numberofdatasources:Tens,Hundreds?Numbersofruletemplates:Tens,Hundreds?Numbersofusers?Numbersofrules?Observation:Manyenterprisesovershoot:theyestimategreaterperformancerequirementsthantheyneed.YesUseYourExistingSoftwareStackIfDelayfromoccurrenceofconditiontoinitiationofresponse:TensofsecondsNumberofdatasources:Ten,Numbersofruletemplates:Ten,Numbersofusers?100sNumbersofrules?1000sThisisthemorecommoncase.SpeedofEDAuptakeEnterprisesareevent-driven.So,whyisEDAuptakeslow?Simpleeventprocessingiswidelyused.EnterpriseservicebusesandEAItoolsallowwhenclausesonsingledocuments(events).MultipleeventstreamsarecorrelatedinsomeapplicationsButtheseappsarenotseenaspartofanEDAparadigm.SpeedofEDAuptakeCorrelationacrossmultipleeventstreamsin:Financialtrading;ITInfrastructuremanagement;Plantcontrol;DefenseWhythesespaces?Smalldesignatedgroupsresponsibleforrespondingtocriticalevents.ClearadditionalvaluePerformanceShouldyoubuildEDA?Yourcompanyisalreadyeventdriven;youhavemanyofthesoftwarecomponents.Question:Doincrementalbenefitsexceedincrementalcosts?ShouldyoubuildEDA?Doyouhave:Applications:Appsthatsenseandrespondtotheenvironmentandthatbenefitfromautomation?Evolvingmiddlewarethatcanbenefitfromasynchronouscoupling?ResponsibilityinasinglegrouporLOB?Performancerequirementsnotmet?Smallnumbersofdatasourcesandruletemplatessatisfyinglargenumbersofusers?ShouldyoubuildEDA?Arecostsoffalseposit