Building Robust Applications by Reusing Non-robust Legacy Software

  • Francisco Guerra Santana
  • Javier Miranda González
  • José Miguel Santos Espino
  • José Carlos Rodríguez Calero
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2043)

Abstract

We propose a methodology for building robust Ada applications by reusing legacy software that we replicate among the nodes of a distributed system in order to increase fault tolerance of the service provided by the reused software. This methodology consists of writing an Ada interface which makes the binding to the legacy library. This interface forwards client requests to a group of remote servers, each one executing a copy of the legacy library. Dependability and consistency issues are solved inside the new interface code. In order to provide continuous service when adding new members, we propose techniques which prevent the server group from stopping service during state transfer. As an example of this methodology we present a robust database.

Keywords

Distributed Systems Fault-Tolerant Systems Continuous Service Robust Database 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Francisco Guerra Santana
    • 1
  • Javier Miranda González
    • 1
  • José Miguel Santos Espino
    • 1
  • José Carlos Rodríguez Calero
    • 1
  1. 1.Instituto Universitario de Microelectrónica Aplicada (IUMA)University of Las Palmas de Gran CanariaCanary IslandsSpain

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