简介:Content-basedrouting(CBR)publish/subscribe(P/S)systemisanimportantclassofdistributedsystems.Thissystemdiffersfromclassicalparadigmsasmessagesareroutedbasedontheircontentratherthantheirdestinationaddress,soastoprovideafine-granularityeventdissemination,andsupportmoreflexibilitydecouplingapplications.Covering-basedroutingisatypicaloptimizationmethodofCBRandhasbeenwidelyusedasabuildingblockinmanydistributedP/Ssystems,foritmaintainsacompactroutingtableandreducesthecostsofcommunicationsandmatchingcomputations.Sofarasweknow,thisoptimizationmethodcanonlybeimplementedonacyclicoverlaynetwork,butcannotbedirectlyutilizedoncyclicnetworks.AstheCBRincyclicsystemsbecomesanewfocusofresearch,developingcovering-basedprotocolsandalgorithmsforcyclicP/Ssystemisbecomingsignificantlyimportant.Thispapercontributesthecycliccovering-basedroutingprotocolwithcorrespondingalgorithmstosupportcovering-basedprotocolincyclicP/Ssystem,andimplementsitinPADRES,adistributedeventmanagementinfrastructurebasedonthepublish/subscribemodel.
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