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)


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.


Distributed Systems Fault-Tolerant Systems Continuous Service Robust Database 


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  1. 1.
    Arévalo, S., Álvarez, A., Miranda, J. and Guerra, F.: A Fault-tolerant Programming Language Based on Distributed Consensus, Cabernet’94 Workshop, Dublin (March 1994)Google Scholar
  2. 2.
    Birman, K., R. Cooper, T. Joseph, K. Marzullo, M. Makpangou, K. Kane, F. Schmuck, and M. Wood. The Isis System Manual. Version 2.1. September 1990.Google Scholar
  3. 3.
    Guerra, F., Arévalo, S., Élvarez, A., and Miranda, J. A Distributed Consensus Protocol with a Coordinator. International Conference on Decentralized and Distributed Systems ICDDS’93. IFIP, Palma de Mallorca (Spain). September 1993.Google Scholar
  4. 4.
    Guerra, F., Arévalo, S., Élvarez, A., and Miranda, J. A Quick Distributed Consensus Protocol. Microprocessing and Microprogramming 39 (1993) pp.111–114.CrossRefGoogle Scholar
  5. 5.
    Guerra, F. 1995. Efficient Consensus Protocols for Distributed Systems. Doctoral Dissertation. Technical University of Madrid. (In Spanish.)Google Scholar
  6. 6.
    Guerra, F. and Miranda, J. and Élvarez, A. and Arévalo, S. An Ada Library to Program Fault-Tolerant Distributed Applications. Reliable Software Technologies. Ada-Europe’97. 1997. pp.230–243.Google Scholar
  7. 7.
    Guerra, F. and Miranda. The Group_IO Interface v3.0. Technical Report (in spanish)
  8. 8.
    Intermetrics, Inc. 1995. Ada 95 Language Reference Manual. Intermetrics, Inc., Cambridge, Mass. (January).Google Scholar
  9. 9.
    Lyu, M. R., ed. Software Fault Tolerance. Chichester, England: John Wiley and Sons, Inc., 1995.Google Scholar
  10. 10.
    Hughes Technologies Tye Ltd.
  11. 11.
    Miranda, J., Élvarez, A., Guerra, F. and Arévalo, S. Drago: A Language for Programming Fault-Tolerant and Cooperative Distributed Applications. Reference Manual.
  12. 12.
    Miranda, J., Élvarez, A., Arévalo, S. and Guerra, F. Drago: An Ada Extension to Program Fault-Tolerant Distributed Applications. Reliable Software Technologies. Ada-Europe’96. 1996. pp.235–246.Google Scholar
  13. 13.
    Miranda, J., Guerra, Martín, J. and González, A. How to Modify GNAT Frontend to Experiment with Ada Extensions. Reliable Software Technologies. Ada-Europe’99. 1999. pp.226–237.Google Scholar
  14. 14.
    Powell, Bonn, Seaton, Verísimo and Waeselynck, The Delta-4 approach to Dependability in Open Distributed Computing Systems, Digest of papers, FTC-18, 1988.Google Scholar
  15. 15.
    Schneider, F.B. Implementing Fault-tolerant Services Using the State Machine Approach: A Tutorial. ACM Computing Surveys, 22(4), December 1990.Google Scholar

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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