L'objet de cette thèse est la modélisation de l'échange dynamique de services. La notion de service joue désormais un rôle clé dans le développement, la diffusion et l'implémentation des systèmes distribués. Cette thèse propose une réflexion sur la notion de service et introduit le concept de Génération Dynamique de Service (GDS) comme une approche différente de l'échange de service en informatique, dans laquelle des services sont dynamiquement construits, fournis et utilisés par des agents (humains ou artificiels). Ces échanges de services sont basés sur des conversations qui ont lieu au sein de différentes communautés. Deux caractéristiques de la GDS sont particulièrement mises en avant : l'aspect orienté agent et l'aspect orienté Grid. La thèse se situe donc à l'intersection de trois domaines~: le Service-Oriented Computing (SOC), les Systèmes Multi-Agents (SMA) et GRID. Les trois contributions majeures sont :: (i) la proposition d'un nouveau modèle de représentation et de communication agent, appelé STROBE, qui permet aux agents de développer dynamiquement un langage différent pour chacun de leurs interlocuteurs. Ils sont capables d'interpréter des messages et d'exécuter des services dans des contextes de conversation dédiés; (ii) une fonction, appelée i-dialogue, qui modélise les conversations agents à l'aide des principes de la programmation applicative/fonctionnelle (i.e., flots, évaluation paresseuse, procédures de première classe) ; (iii) un modèle d'intégration GRID-SMA qui représente les capacités des agents par des services Grid. Dans ce modèle, un langage formel, appelé Agent-Grid Integration Language (AGIL), décrit sémantiquement et graphiquement les concepts clés de GRID et SMA, leurs relations, ainsi que les règles de leur intégration. AGIL intègre tous les résultats de la thèse en proposant une formalisation des interactions entre agents pour l'échange de services sur le Grid.

Na ultima década o paradigma de computação orientada a serviços (SOC - Service Oriented Computing) tem ganhado cada vez mais espaço na indústria e na academia, a fim de solucionar o problema da falta de comunicação entre os diversos sistemas de informação presentes dentro de um ambiente corporativo. Graças aos recentes avanços da chamada \"Web 2.0\" um novo estilo arquitetural chamado de Arquitetura orientada a Web (WOA - Web Oriented Architecture) foi proposto a fim de garantir uma maneira simples de conectar os componentes de software dinamicamente. Esse estilo tem como um dos princípios o uso de serviços Web RESTful, a fim de conseguir uma interface funcional simples e uniforme. Este trabalho apresenta um ambiente colaborativo de apoio ao desenvolvimento de serviços Web RESTful utilizando o paradigma de desenvolvimento orientado a modelos (MDD - Model Driven Development). Pretende-se mostrar os benefícios do MDD aplicado a Engenharia Web e também as vantagens apresentadas pela colaboração nesse cenário. Foi realizado ainda um experimento a fim de comprovar a eficiência do ambiente colaborativo e benefícios alcançados por ele / In the last decade the paradigm of Service Oriented Computing has gained more attention in industry and academia in order to solve the problem of lack of communication between different information systems present within a corporate environment. Due to recent advances in Web 2.0 a new architectural style called Web Oriented Architecture is proposed to ensure a simple way to connect software components dynamically. This style has as a principle the use of RESTful Web Services in order to achieve a uniform interface simple and functional. This paper presents a collaborative environment to support the development of RESTful Web Services using the Model Driven Development paradigm. It is intended to show the benefits of MDD applied to Web Engineering and also the advantages presented by collaboration in this scenario. It was also performed a experiment to prove the efficiency of the collaborative environment and benefits achieved by the same

Orientador: Eleri Cardozo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-06T07:45:33Z (GMT). No. of bitstreams: 1 Souza_VictorAlexandreSiqueiraMarquesde_M.pdf: 2295226 bytes, checksum: 9e36093f901c39f33bc909f01e4bd421 (MD5) Previous issue date: 2006 / Resumo: Novos serviços de rede devem ser desenvolvidos e gerenciados de acordo com os requisitos específicos dos clientes. Nesse contexto, provedores de serviço devem criar uma nova forma de projetar serviços de rede com tempo de desenvolvimento próximo a zero e alto nível de customização e evolução. A customização é necessária para criação de serviços que satisfaçam aos requisítos do cliente enquanto evolução é necessária para adaptar o serviço assim que esses requisitos se alterem. Além disso, clientes têm demandado a capacidade de gerenciar o serviço para manter o uso, configuração e evolução sob seu controle. Este trabalho apresenta uma abordagem baseada na arquitetura orientada a serviço para o desenvolvimento de serviços de rede capazes de cumprir os requisitos de rápida instalação, customização e gerenciamento por parte do cliente. Esta abordagem considera os serviços de rede como um conjunto de elementos interativos implementados como serviços web. A lógica do serviço é expressa através da orquestração de serviços web. Dois serviços para o gerenciamento de conexões em redes ópticas são apresentados como estudo de caso / Abstract: New generation network services must be developed and managed according to the customers' specific requírements. In this context, service providers must devise a way to design network services with near zero development time and high degrees of customization and evolution. Customízation is necessary to fit the service according to the customers requirements, while evolutíon is necessary to adapt the service as soon as these requírements change. ln addition, customers are demanding the ability to manage the service in order to keep the usage, configuratíon, and evolution under their control. This paper presents an approach based on Service Oriented Archítecture (SOA) for developing network services able to fulfill the requirements of rapid deployment, customization, and customer-side manageability. The approach considers the network service as a set of interactíng elements implemented as web services. The service logic is expressed in terms of web services orchestration. Two services for the management of connections in optical networks are presented as a case study / Mestrado / Engenharia de Computação / Mestre em Engenharia Elétrica

Coreografias de serviços Web representam uma forma mais escalável e flexível de compor serviços do que uma abordagem centralizada como a orquestração, e seu papel na integração e comunicação de sistemas de larga escala é vital para os objetivos da SOC (Computação Orientada a Serviços) e da Internet do Futuro. Atualmente coreografias de serviços Web possuem vários desafios de pesquisa, dos quais a qualidade de serviço (QoS) e o monitoramento de coreografias de serviçosWeb são linhas importantes. O objetivo deste trabalho é propor e implementar um mecanismo de monitoramento não intrusivo de coreografias de serviços Web baseado em SLAs (Acordos de Nível de Serviço) que especificam as restrições de atributos de QoS de maneira probabilística. Esta dissertação propõe um mecanismo para coreografias de serviços Web que: (1) define requisitos de QoS; (2) especifica contratos probabilísticos sobre parâmetros de QoS usando SLA; e (3) realiza um monitoramento não intrusivo de coreografias de serviços Web para detectar violações de SLA. / Web services choreographies are a more scalable and flexible way to compose services than a centralized approach like orchestrations, and its role in the integration and communication of large-scale systems is vital for the goals of SoC (Service Oriented Computing) and Future Internet. Currently,Web services choreographies have several research challenges. From all challenges, quality of service (QoS) and monitoring of Web services choreography are important research lines. The goal of this work is to propose and implement a mechanism for non-intrusive monitoring of Web services choreography based on SLAs (Service Level Agreements) that define constraints of QoS attributes in a probabilistic way. This thesis proposes a mechanism for Web services choreographies that:(1) defines QoS requirements; (2) specifies probabilistic contracts on QoS parameters using SLAs; and (3) monitors, non-intrusively, the enactment of Web services choreographies to detect SLA violations.

L'orientation service occupe de plus en plus une place importante dans la structuration des systèmes complexes. La conception et le développement d'applications évoluent progressivement d'un modèle traditionnel vers un modèle plus dynamique orienté services où la réutilisation et l'adaptabilité jouent un rôle important. Dans cette thèse, nous proposons une étude portant sur la conception et le développement d'applications par composition de services. Nous décrivons un environnement de partage de services : DyCoSe. Il consiste en un écosystème coopératif où les entreprises membres, organisées en communautés, partagent un consensus global représentant les fonctionnalités métier récurrentes et les propriétés non fonctionnelles communes. La composition d'applications dans DyCoSe repose sur une architecture à trois niveaux combinant à la fois une démarche descendante et une autre ascendante. La démarche descendante permet de décrire l’application à travers une interaction de composants haut niveau et de la raffiner en une ou plusieurs orchestrations de services. La démarche ascendante projette les caractéristiques de l’infrastructure réseau sous-jacente au niveau services. Un processus d’instanciation visant à réaliser une application composite est détaillé. Il formalise le choix des services, selon un ensemble de contraintes données, comme un problème d’optimisation de coûts. Deux solutions au problème d’instanciation sont étudiées. Une solution globale tient compte de l’ensemble des services disponibles dans l’écosystème et une solution locale favorise les services de certaines communautés. Un algorithme génétique est décrit comme implémentation de l’instanciation globale. Une simulation stochastique de l’environnement DyCoSe est proposée. Elle permet d'étudier les possibilités d’instanciation d’une application donnée dans un environnement où la disponibilité des services n’est pas garantie. Elle permet d'étudier aussi, le taux de réussite de l’exécution d’une instance d’une application donnée. / The service oriented computing paradigm plays an increasingly important role in structuring complex systems. Application design and development approaches are witnessing a shift from traditional models towards a more dynamic service oriented model promoting reuse and adaptability. In this thesis, we study an approach for application design and development based on services’ composition. We propose DyCoSe, an environment for sharing services. It consists of an enterprise ecosystem wherein members, organized in communities, share a global agreement describing traditional business functionalities and common non-functional properties. DyCoSe relies on a three level architecture for service based application composition combining both, a top down and a bottom up composition approach. The top down part describes an application using high-level components and refines it to an orchestration of services. The bottom up part projects network characteristics to the services’ level. An instantiation process aiming at realizing an application is described. It formalizes services’ selection as a cost optimization problem considering a set of user given constraints. Two solutions of the instantiation problem are proposed. A global solution considers all the available services in an ecosystem. A local solution gives priority to services of selected communities. A genetic algorithm implements the global instantiation. A stochastic simulation of DyCoSe is proposed. It allows studying the instantiation success rate and the application execution success rate both in a dynamic environment wherein services availability is not guaranteed.

Made available in DSpace on 2014-12-17T15:48:05Z (GMT). No. of bitstreams: 1 EvertonRSC_DISSERT.pdf: 4653595 bytes, checksum: 83e897be68464555082a55505fd406ea (MD5) Previous issue date: 2013-01-31 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / With the advance of the Cloud Computing paradigm, a single service offered by a cloud platform may not be enough to meet all the application requirements. To fulfill such requirements, it may be necessary, instead of a single service, a composition of services that aggregates services provided by different cloud platforms. In order to generate aggregated value for the user, this composition of services provided by several Cloud Computing platforms requires a solution in terms of platforms integration, which encompasses the manipulation of a wide number of noninteroperable APIs and protocols from different platform vendors. In this scenario, this work presents Cloud Integrator, a middleware platform for composing services provided by different Cloud Computing platforms. Besides providing an environment that facilitates the development and execution of applications that use such services, Cloud Integrator works as a mediator by providing mechanisms for building applications through composition and selection of semantic Web services that take into account metadata about the services, such as QoS (Quality of Service), prices, etc. Moreover, the proposed middleware platform provides an adaptation mechanism that can be triggered in case of failure or quality degradation of one or more services used by the running application in order to ensure its quality and availability. In this work, through a case study that consists of an application that use services provided by different cloud platforms, Cloud Integrator is evaluated in terms of the efficiency of the performed service composition, selection and adaptation processes, as well as the potential of using this middleware in heterogeneous computational clouds scenarios / Com o avan?o do paradigma de Computa??o em Nuvem, um ?nico servi?o oferecido por uma plataforma de nuvem pode n?o ser suficiente para satisfazer todos os requisitos da aplica??o. Para satisfazer tais requisitos, ao inv?s de um ?nico servi?o, pode ser necess?ria uma composi??o que agrega servi?os providos por diferentes plataformas de nuvem. A fim de gerar valor agregado para o usu?rio, essa composi??o de servi?os providos por diferentes plataformas de Computa??o em Nuvem requer uma solu??o em termos de integra??o de plataformas, envolvendo a manipula??o de um vasto n?mero de APIs e protocolos n?o interoper?veis de diferentes provedores. Nesse cen?rio, este trabalho apresenta o Cloud Integrator, uma plataforma de middleware para composi??o de servi?os providos por diferentes plataformas de Computa??o em Nuvem. Al?m de prover um ambiente que facilita o desenvolvimento e a execu??o de aplica??es que utilizam tais servi?os, o Cloud Integrator funciona como um mediador provendo mecanismos para a constru??o de aplica??es atrav?s da composi??o e sele??o de servi?os Web sem?nticos que consideram metadados acerca dos servi?os, como QoS (Quality of Service), pre?os etc. Adicionalmente, a plataforma de middleware proposta prov? um mecanismo de adapta??o que pode ser disparado em caso de falha ou degrada??o da qualidade de um ou mais servi?os utilizados pela aplica??o em quest?o, a fim de garantir sua a qualidade e disponibilidade. Neste trabalho, atrav?s de um estudo de caso que consiste de uma aplica??o que utiliza servi?os providos por diferentes plataformas de nuvem, o Cloud Integrator ? avaliado em termos da efici?ncia dos processos de composi??o de servi?os, sele??o e adapta??o realizados, bem como da potencialidade do seu uso em cen?rios de nuvens computacionais heterog?neas