A Moile Agent Approach to Processbased Dynamic Adaptation of 一种移动代理的方法为基础的动态适应过程.pptVIP

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A Moile Agent Approach to Processbased Dynamic Adaptation of 一种移动代理的方法为基础的动态适应过程.ppt

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A Moile Agent Approach to Processbased Dynamic Adaptation of 一种移动代理的方法为基础的动态适应过程

A Mobile Agent Approach to Process-based DynamicAdaptation of Complex Software Systems G. Valetto, G. Kaiser, and G. S. Kc Columbia University - TILab {valetto, kaiser, gskc}@cs.columbia.edu June 18, 2001 Dynamic Adaptation (DA): Definition Modifying on the fly the ABC of distributed applications Architecture Behavior Configuration At run time = no interruption of service Many objectives: support run-time software assembly enforce adherence to requirements and SLA ensure QoS of mission-critical systems recover from and prevent faults upgrade seamlessly Scope of Dynamic Adaptation Alleviate some difficulties of modern software development via integration/composition Heterogeneity: “systems of systems” Maintenance complexity Shrinking time-to-market abbreviates pre-deployment quality assurance Complementary approach to best development SE practices Addresses some of the same concerns but carries them over to the post-development cycle (run time) Not as comprehensive as re-engineering but … … may avoid some spiral iterations Process- and agent-based DA Why? Exploit convergence between: increasing process automation and distribution in PCEs increasing autonomy of SW agent technologies DA requires orchestration of interdependent actions: performed by multiple actors in different locations in a timely way This is a job for a decentralized process enactment engine. How? DA process codifies formalized knowledge about the target system within process info Dispatches mobile agents to target system components to perform DA tasks Coordinates actions of agents via process enactment Addresses at runtime some concerns normally dealt with only at development time component integration configuration management verification and validation deployment and evolution Separation of concerns Process- and agent-based DA allows to separate the concerns of coordination and computation Process: provides coordination “glue” to build, operate computational systems composed of many sma