Un canevas pour l'adaptation et la substitution de services Web

Yehia Taher 1, 2
1 SOC - Service Oriented Computing
LIRIS - Laboratoire d'InfoRmatique en Image et Systèmes d'information
2 MRIM - Modélisation et Recherche d’Information Multimédia [Grenoble]
Inria - Institut National de Recherche en Informatique et en Automatique, LIG - Laboratoire d'Informatique de Grenoble
Abstract : Web services have emerged as a support for development and integration of applications and information systems. In this context, the interactions between two consumer and supplier applications, encapsulated by Web services are done by exchanging messages. These exchanges are based on the concept of interfaces, which describe the interactions in which a service can handle and dependencies between these interactions. In the current Web, it is very often that many services meet the same set of functional requirements. These services are often delivered through different interfaces. For many reasons, such as failure of the service provider, the consumer has to replace his usual supplier with another supplier that offers the same functionality. This substitution leads to incompatibilities between the interfaces of the service consumer and new service provider. This is because the customer service was not been developed according to the new service provider. The research we conduct in this thesis aims to solve the problem of incompatibility in the interaction between two services; consumer and new provider. In particular, our contribution extends both in theory and in practice. It is a part of a framework for the automatic generation of adapters for interactions between two services. On the other hand, we propose a multi-layer software architecture providing a framework for transparent and flexible substitution of a service provider by another with respect to an existed consumer. In our framework for automatic generation of adapters, services interfaces modeling using automata has been adopted. Then, a step of detecting incompatibilities between them is achieved. After that, an adapter of the interactions between the two services is generated automatically based on the detected incompatibilities. The generation of the adapter is based on the automata model. The generated adapter automaton contains a sufficient detail for the projected technology CEP (Complex Event Processing). This projection is performed using components templates that are implemented by us. Each template is designed to generate executable code (in terms of continuous requests) for the CEP technology. Our proposed architecture for the substitution of integrated Web services is an approach for deploying communities of Web services. A community promotes the dynamic binding of Web services through software named OSC (Open Service Connectivity). A community service is seen as a way to expose common descriptions of a desired functionality without explicitly referring to a specific service. OSC is a software component whose objective is to apply the principle of ODBC and JDBC in an environment based on Web services. Specifically, it is responsible for managing interactions between communities of consumers on the one hand and communities on the other hand, providing functions for the selection and substitution of services.
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Yehia Taher. Un canevas pour l'adaptation et la substitution de services Web. Web. Université Claude Bernard - Lyon I, 2009. Français. ⟨NNT : 2009LYO10125⟩. ⟨tel-00996101⟩

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