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Web services

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Publications

  • 2016
    Jaber Kouki, Haithem Mezni

    Semantic QoS synchronization of Web services

    2016 International Symposium on Networks, Computers and Communications (ISNCC), 2016

    Résumé

    Due to their promise to transform the way business is conducted, Web services increased tremendously in number. Accordingly, service providers are competing to make their services more visible to get closer to service consumers. This fact leads to having service description (including the quality of service, for short, QoS) of same Web services published in many service registries but with different vocabularies and terminologies according to the service publication requirements of each service publisher. Consequently, the challenge is how to synchronize QoS values over these service registries, whenever they are updated. The solution to this problem should be based on the semantics of QoS to be able to synchronize their values regardless of their different representations.

  • Haithem Mezni, Mokhtar Sellami

    AWS-Ont: An Ontology for the Self-Management of Service-Based Systems

    IEEE 8th International Conference on Service-Oriented Computing and Applications (SOCA), 2015

    Résumé

    With the increasing complexity of Web service management in highly dynamic environments, service providers must participate to the self-adaptation process as they are aware of the capabilities and requirements of their executing services. However, defining additional adaptation policies demands a greater effort. A primary condition to reuse other providers' policies is to understand the information specifying a service behavior. Despite several efforts, a common self-management syntax and semantic was not achieved. In this paper, we propose an ontology-based categorization of autonomic service metadata, which will be used not only for policy discovery and integration, but also for the composition of self-adaptive Web services. We, then, propose to semantically annotate providers' policies. This allows providers to discover and reuse policies based on their semantic meaning. Finally, we propose a framework for the discovery, matching, and integration of providers' policies.

  • Haithem Mezni

    Towards trustworthy service adaptation: An ontology-based cross-layer approach

    IEEE 5th International Conference on Software Engineering and Service Science, 2014

    Résumé

    Although several approaches have been proposed towards self-adaptation of Web services, most of them work in isolation and few of them deal with cross-layer and trust issues. Indeed, the complex layered nature of service-based systems frequently leads to service failure and conflicting adaptation. To tackle this problem, we propose an ontology-based categorization of service behavior across all the functional layers. The proposed ontology provides support for cross-layer self-adaptation by facilitating reasoning about events to identify the real source of service failure, and reasoning about self-adaptation actions to check integrity and compatibility of self-adaptation with constraints imposed by each layer.

  • Walid Chainbi, Haithem Mezni, Khaled Ghedira

    An autonomic registry-based SOA model

    EEE International Conference on Service-Oriented Computing and Applications, 2011

    Résumé

    In the last years, the need for integrating QoS to service oriented architecture (SOA) has become a significant factor for managing service-based systems. In addition, combining self-* and policy-based management has major advantages since it reduces complexity management and effectively drives self-adaptation of Web services. Current service oriented architecture does not support policy-based self-management. In this paper, we present a SOA model based on autonomic registries which are endowed with self-* capabilities. Autonomic registries are in charge of managing their content and collaborating in a federated manner with other autonomic actors in order to maintain service quality, and consequently to participate in the self-adaptation process of executing Web services. The proposed model is combined with a technology that has found popularity and acceptance namely WS-Policy. We extend WS-Policy to represent a rich Web service information model based on QoS data and additional information such as service specific adaptation actions. UDDI is also extended to support policy-based self-management.

  • Walid Chainbi, Haithem Mezni, Khaled Ghedira

    PECoDiM: An Agent Based Framework for Autonomic Web Services

    World Congress on Services, 2010

    Résumé

    Autonomic computing is about systems that can manage themselves. Self-management includes self-configuration, self-healing, self-optimization, etc. (self-* properties). Agent technology offers key advantages for the development of autonomic computing systems as it supports autonomy, adaptability, etc. Current Web service standards and technologies don't provide a suitable architecture in which all aspects of self-management can be designed. In this paper, we present an agent-based framework for autonomic Web services. This framework is based on a multi-agent system made up with five agents namely a Planning agent, an Execution agent, a Composition agent, a Discovery agent, and a Monitoring agent.

    Walid Chainbi, Haithem Mezni, Khaled Ghedira

    An Autonomic Computing Architecture for Self-* Web Services

    Autonomic Computing and Communications Systems, 2010

    Résumé

    Adaptation in Web services has gained a significant attention and becomes a key feature of Web services. Indeed, in a dynamic environment such as the Web, it's imperative to design an effective system which can continuously adapt itself to the changes (service failure, changing of QoS offering, etc.). However, current Web service standards and technologies don’t provide a suitable architecture in which all aspects of self-adaptability can be designed. Moreover, Web Services lack ability to adapt to the changing environment without human intervention. In this paper, we propose an autonomic computing approach for Web services’ self-adaptation. More precisely, Web services are considered as autonomic systems, that is, systems that have self-* properties. An agent-based approach is also proposed to deal with the achievement of Web services self-adaptation.