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Model-checking web services business activity protocols

  • TACAS 2011
  • Published:
International Journal on Software Tools for Technology Transfer Aims and scope Submit manuscript

Abstract

Web services business activity (WS-BA) specification defines two coordination protocols BAwCC (Business Agreement with Coordination Completion) and BAwPC (Business Agreement with Participant Completion) that ensure a consistent agreement on the outcome of long-running distributed applications. To verify fundamental properties of the protocols, we provide formal analyses in the model checker Uppaal. Our analyses are supported by a newly developed tool chain, where in the first step we translate tables with state-transition protocol descriptions into an intermediate XML format, and in the second step we translate this format into a network of communicating state machines directly suitable for verification in Uppaal. Our results show that the WS-BA protocols, as described in the standard specification, violate correct operation by reaching invalid states for all underlying communication media except for a perfect FIFO. Hence, we propose changes to the protocols and a further investigation of the modified protocols suggests that in case of the BAwCC protocol, messages should be received in the same order as they are sent to preserve correct behaviour, while BAwPC is now correct even for asynchronous, unordered, lossy and duplicating media. Another important property of communication protocols is that all parties always reach, under certain fairness assumptions, their final states. Based on an automatic verification with different communication models, we prove that our enhanced protocols satisfy this property whereas the original protocols do not. All verification results presented in this article were performed in a fully automatic way using our new tool csv2uppaal.

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Authors and Affiliations

  1. Brazilian Society of Health Informatics, Rua Tenente Gomes Ribeiro, 57-sala 33, Vila Clementino, São Paulo, SP, Brazil

    Abinoam P. Marques Jr.

  2. Department of Computer Science, Aalborg University, Selma Lagerlöfs Vej 300, 9220, Aalborg East, Denmark

    Anders P. Ravn, Jiří Srba & Saleem Vighio

Authors
  1. Abinoam P. Marques Jr.
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  2. Anders P. Ravn
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  3. Jiří Srba
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  4. Saleem Vighio
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Corresponding author

Correspondence to Saleem Vighio.

Additional information

The paper is supported by VKR Center of Excellence MT-LAB. A. P. Marques Jr. is affiliated to the Brazilian Society of Health Informatics.

S. Vighio is supported by Quaid-e-Awam University of Engineering, Science, and Technology, Nawabshah, Pakistan, and partially by the Nordunet3 project COSoDIS.

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Marques, A.P., Ravn, A.P., Srba, J. et al. Model-checking web services business activity protocols. Int J Softw Tools Technol Transfer 15, 125–147 (2013). https://doi.org/10.1007/s10009-012-0231-4

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