移动agent通信协议的设计与分析.ppt

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1、移动agent通信协议的设计与分析答辩人：冯新宇指导教师：吕建教授南京大学计算机软件研究所2002年6月4日OutlineofPresentationIntroduction:Inter-AgentMessagePassingARP:DesignandAnalysisGeneralization:AGenericFrameworkConclusionandFutureWorkIntroduction:BasicConceptsMobileAgentsMobileAgentsareautonomousobjectsor

2、objectclusters,whichareabletomovebetweenlocationsinaso-calledmobileagentplatform.(Mole,UofStuttgart)MobileAgentPlatformAmobileagentplatformisadistributedabstractionlayerthatprovidestheconceptsandmechanismsformobilityandcommunicationononehand,andsecurityoftheunde

3、rlyingsystemontheotherhand.WhyMessagePassingMobileAgentSystemcanbeusedasGeneral-PurposeDistributedComputingMiddlewarePlatform.SometimesMessagePassingismoreefficientthanmigrationThereDOexistMA-basedapplicationsthatneedsremotemessagepassingbetweencooperatingagents

4、.Inter-AgentMessagePassing-RequirementsLocationTransparencyMessagesenderdoesnotneedtoknowthephysicallocationofthereceiveragent,whoseaddresschangesfrequentlybymovingfromonehosttoanother.ReliabilityTheconcurrentandasynchronousnatureofmessageforwardingandagentmigr

5、ationmaycausemessagelossorchasingproblem.Byreliabilitywemeanthemessagecanreachthetargetagentbyaboundednumberofforwarding.MAPMAPMAPMAPInter-AgentMessagePassing-RequirementsEfficiencyLowlocationupdatingoverheadLowmessagedeliveryoverheadAsynchronyAsynchronousexecu

6、tionLittleconstraintonthemobileagentmobility.AdaptabilitySuitdifferentCommunicationandMigrationPatternIntroduction:Inter-AgentMessagePassingARP:DesignandAnalysisDesignofARPAnalysisofARPImprovementsGeneralization:AGenericFrameworkConclusionandFutureWorkDesignofAR

7、P(AdaptiveandReliableProtocol)MobileIPsolutionExtention1:MobileIP+SynchronizationExtension2:DistributedHomeSchemeExtension3:Mailbox-BasedScheme=ARPMobileIPSolutionMAPMAPMAPMAP-HomeRegDesignofARPMobileIPsolutionNoReliabilitySupportExtention1:MobileIP+Synchronizat

8、ionTheagenthomecoordinatesmessagepassingandagentmigrationExtension2:DistributedHomeSchemeExtension3:Mailbox-BasedScheme=ARPMAPMobileIP+SynchronizationMAPMAPMAP-HomeDe