qrs workflow execution models and design patterns

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1、K2thick-clientdesignerexampleExecutionModelK2web-baseddesignerexampleSequentialExecutionMostcommonimplementationTasksfollowoneaftertheotherTasksonlystartwhentheprecedingtaskhascompleted.ThismodelisusuallysufficienttocovermostsimpleworkflowrequirementsUseCasesSerial(sequential)a

2、pprovalsSequenceofservertasksParallelExecutionMultipleactivitiesareactiveatthesametimeTasksareperformedinparallelUseCasesDifferentusers/groupsneedtoworkonthesameworkflowatthesametimeNotesYoumustcreateaPrecedingRuleforthe“joining”activity.Precedingrulewillcheckthatboththeparal

3、leltaskshavecompletedbeforeitwillallowthenextactivitytostartHybridExecutionCombineSerialandParallelexecutionmodelsinoneprocessUseCasesChainseveralserialtasksintooneparallel“leg”oftheworkflowNotesYoumustcreateaPrecedingRuleforthe“joining”activity.ParentProcess-ChildProcess(IPC)O

4、neworkflowstartsanotherworkflowParentprocessmayormaynotwaitforchildprocesstocompleteParentprocesscanstartmultipleinstancesofachildprocessUseCasesSplitalargerprocessintosub-processesCreategenericallyre-usableworkflowsStartmultipleinstancesofachildprocessfromaparentprocessNotes

5、ChildprocesscanbestartedSynchronously,wheretheparentprocesswillnotcontinueuntilthechildworkflowhascompletedorAsynchronously,wheretheparentprocesswillcontinueimmediately(fire-and-forget)Parentprocesscanpassdatavaluestothechildprocess,butcanonlygetupdateddatavaluesbackifthechildproc

6、esswasstartedsynchronouslyYoucandefinetheusercredentialstostartthechildprocessWhenstartingmultipleinstancesofachildprocess,youmayneedtodefineasucceedingruleintheparentprocessIPCactivitytowaitforallchildrentocomplete:AllofActivityInstanceDestinationStatus=CompletedPAGE1of2K2thick-

7、clientdesignerexampleDesignPatternK2web-baseddesignerexampleReworkpatternUsedwhentheprocesscouldcontainanunknownnumberofreworksteps.Typicalexample:Documentapprovalprocesswherethedocumentreviewermaysendthedocumentbackforreworkmultipletimes,untiltheyaresatisfiedwiththedocument.UseC

8、asesUnknownnumberofrework