Fine-Grained Dynamic Adaptation of Distributed Components

  • Frédéric Peschanski
  • Jean-Pierre Briot
  • Akinori Yonezawa
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2672)


Dynamic adaptability of distributed components, nowadays scarcely supported, should become a basic principle of future middleware platforms. While most related work envisage somewhat large software reconfigurations, we explore in this paper fine-grained adaptations which intervene within component boundaries. Our experiments are conducted in the framework of the Comet middleware. Dynamic adaptability is supported in Comet through distributed protocols that can be applied at runtime. These protocols may locally denote intrusive modifications which are abstracted through the notion of role. Functional roles are used to describe all-purpose adaptations. We use hook roles as wrappers around existing functionalities. Finally, filter roles interfere with the communication layer. The expressiveness of these complementary abstractions are illustrated in various examples involving non-trivial system adaptations for distributed debugging and communication flow synchronization. A preliminary but promising quantitative evaluation of our adaptation engine under real-world conditions is proposed. We also discuss the difficult but crucial issue of verifying such dynamic adaptations in terms of type, access and security contracts.


Dynamic Adaptability Component-based Middleware Fine-grain adaptations Event-based Asynchronous Communications Strong typing 


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Copyright information

© IFIP International Federation for Information Processing 2003

Authors and Affiliations

  • Frédéric Peschanski
    • 1
  • Jean-Pierre Briot
    • 2
  • Akinori Yonezawa
    • 1
  1. 1.University of TokyoJapan
  2. 2.Laboratoire d’Informatique de Paris 6France

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