Nos últimos anos, a tecnologia de Web Services vem sendo pesquisada nas mais diversas áreas da computação, incluindo a de gerenciamento de redes de computadores. A composição de serviços, uma nova funcionalidade surgida recentemente, parece ter a potencialidade de resolver diversos problemas de diversas áreas da computação, incluindo a área de gerenciamento de redes e seu respectivo protocolo padrão de facto, o SNMP. Através da composição de serviços, é possível construir serviços mais sofisticados, usando-se serviços mais simples como componentes. Este trabalho tem por objetivo investigar a composição de Web Services aplicada ao gerenciamento de redes de computadores. Para tanto, modelos e padrões para composição foram estudados e uma arquitetura de composição, usando o padrão WS-BPEL, aplicada ao gerenciamento foi proposta. Tal arquitetura permite iniciar uma cadeia de ações de gerenciamento em gerentes de nível mais baixo baseados em Web Services através de uma única requisição Web Service. Para definir novas composições, uma ferramenta Web foi desenvolvida, a qual gera automaticamente o código WS-BPEL. Além disso, foram realizadas avaliações de desempenho para verificar o impacto na rede das composições. Os resultados obtidos mostraram que composições podem reduzir o tráfego gerado na rede junto à estação de gerenciamento, pois permitem concentrar diversas informações em uma única requisição Web Services. O tempo de resposta também pôde ser reduzido em algumas situações devido às requisições nativamente paralelas do WS-BPEL. / In the recent years, the Web Services technology has been researched in many areas of computer science, including computers network management. Service composition, a new feature recently raised, seems to have the potentiality to solve several problems in computer science, including the network management field and its Simple Network Management Protocol (SNMP). Through service composition, it is possible to build up more sophisticated services using simpler services as components. Therefore, this work aims at investigating Web Services composition applied to network management. Towards this goal, models and standards for composition were reviewed and a WS-BPEL-based composition architecture devoted to management was proposed. Such architecture allows starting a chain of management actions on lowerlevel Web Services-based managers through only one Web Services request. In order to define new compositions, a Web-based tool was developed to automatically generate the WS-BPEL required code. In addition, performance evaluations were carried out in order to verify the compositions’ impact on the managed network. The results showed that compositions can reduce the management traffic in the surroundings of the management station by aggregating several information in only one Web Services request. Response time could also be decreased in some situations due to the native parallel requests of WS-BPEL.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-22T21:43:01Z No. of bitstreams: 1 MarcioAlvesDeMacedo_DISSERT.pdf: 2923226 bytes, checksum: e6a66719b01ddee0f70ac0a7f964923e (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-23T23:10:23Z (GMT) No. of bitstreams: 1 MarcioAlvesDeMacedo_DISSERT.pdf: 2923226 bytes, checksum: e6a66719b01ddee0f70ac0a7f964923e (MD5) / Made available in DSpace on 2016-02-23T23:10:23Z (GMT). No. of bitstreams: 1 MarcioAlvesDeMacedo_DISSERT.pdf: 2923226 bytes, checksum: e6a66719b01ddee0f70ac0a7f964923e (MD5) Previous issue date: 2015-02-26 / M?quinas de redu??o de grafos, s?o tradicionalmente utilizadas na implementa??o de linguagens de programa??o. Elas permitem executar programas (representados como grafos), atrav?s da aplica??o sucessiva de regras de redu??o. A composi??o de servi?os web permite a cria??o de novos servi?os web a partir de servi?os web j? existentes. BPEL ? a linguagem padr?o para criar composi??es de servi?os web como fluxos de trabalho. No entanto, o uso de BPEL para definir composi??es que usem outras tecnologias, al?m dos servi?os web n?o ? imediato. Na maioria dos casos, quando opera??es que n?o fazem parte do dom?nio dos servi?os web precisam ser executadas nas regras de neg?cio de uma empresa, parte do trabalho ? realizado de forma ad-hoc. Permitir que opera??es oriundas de diferentes tecnologias possam fazer parte de um mesmo fluxo de trabalho auxilia a cria??o de fluxos de trabalho mais adequados ?s necessidades das organiza??es. Esta disserta??o define uma variante da linguagem BPEL para a cria??o de composi??es com opera??es de servi?os web, tarefas de big data ou opera??es definidas pelo usu?rio. O suporte a esta linguagem ? dado mediante a defini??o de uma m?quina de redu??o de grafos extens?vel, a qual permite a execu??o de programas definidos na linguagem proposta. Esta m?quina ? implementada como prova de conceito. A proposta deste trabalho ? avaliada mediante a apresenta??o de resultados experimentais. / Graph Reduction Machines, are a traditional technique for implementing functional programming languages. They allow to run programs by transforming graphs by the successive application of reduction rules. Web service composition enables the creation of new web services from existing ones. BPEL is a workflow-based language for creating web service compositions. It is also the industrial and academic standard for this kind of languages. As it is designed to compose web services, the use of BPEL in a scenario where multiple technologies need to be used is problematic: when operations other than web services need to be performed to implement the business logic of a company, part of the work is done on an ad hoc basis. To allow heterogeneous operations to be part of the same workflow, may help to improve the implementation of business processes in a principled way. This work uses a simple variation of the BPEL language for creating compositions containing not only web service operations but also big data tasks or user-defined operations. We define an extensible graph reduction machine that allows the evaluation of BPEL programs and implement this machine as proof of concept. We present some experimental results.

Nos últimos anos, a tecnologia de Web Services vem sendo pesquisada nas mais diversas áreas da computação, incluindo a de gerenciamento de redes de computadores. A composição de serviços, uma nova funcionalidade surgida recentemente, parece ter a potencialidade de resolver diversos problemas de diversas áreas da computação, incluindo a área de gerenciamento de redes e seu respectivo protocolo padrão de facto, o SNMP. Através da composição de serviços, é possível construir serviços mais sofisticados, usando-se serviços mais simples como componentes. Este trabalho tem por objetivo investigar a composição de Web Services aplicada ao gerenciamento de redes de computadores. Para tanto, modelos e padrões para composição foram estudados e uma arquitetura de composição, usando o padrão WS-BPEL, aplicada ao gerenciamento foi proposta. Tal arquitetura permite iniciar uma cadeia de ações de gerenciamento em gerentes de nível mais baixo baseados em Web Services através de uma única requisição Web Service. Para definir novas composições, uma ferramenta Web foi desenvolvida, a qual gera automaticamente o código WS-BPEL. Além disso, foram realizadas avaliações de desempenho para verificar o impacto na rede das composições. Os resultados obtidos mostraram que composições podem reduzir o tráfego gerado na rede junto à estação de gerenciamento, pois permitem concentrar diversas informações em uma única requisição Web Services. O tempo de resposta também pôde ser reduzido em algumas situações devido às requisições nativamente paralelas do WS-BPEL. / In the recent years, the Web Services technology has been researched in many areas of computer science, including computers network management. Service composition, a new feature recently raised, seems to have the potentiality to solve several problems in computer science, including the network management field and its Simple Network Management Protocol (SNMP). Through service composition, it is possible to build up more sophisticated services using simpler services as components. Therefore, this work aims at investigating Web Services composition applied to network management. Towards this goal, models and standards for composition were reviewed and a WS-BPEL-based composition architecture devoted to management was proposed. Such architecture allows starting a chain of management actions on lowerlevel Web Services-based managers through only one Web Services request. In order to define new compositions, a Web-based tool was developed to automatically generate the WS-BPEL required code. In addition, performance evaluations were carried out in order to verify the compositions’ impact on the managed network. The results showed that compositions can reduce the management traffic in the surroundings of the management station by aggregating several information in only one Web Services request. Response time could also be decreased in some situations due to the native parallel requests of WS-BPEL.

Nos últimos anos, a tecnologia de Web Services vem sendo pesquisada nas mais diversas áreas da computação, incluindo a de gerenciamento de redes de computadores. A composição de serviços, uma nova funcionalidade surgida recentemente, parece ter a potencialidade de resolver diversos problemas de diversas áreas da computação, incluindo a área de gerenciamento de redes e seu respectivo protocolo padrão de facto, o SNMP. Através da composição de serviços, é possível construir serviços mais sofisticados, usando-se serviços mais simples como componentes. Este trabalho tem por objetivo investigar a composição de Web Services aplicada ao gerenciamento de redes de computadores. Para tanto, modelos e padrões para composição foram estudados e uma arquitetura de composição, usando o padrão WS-BPEL, aplicada ao gerenciamento foi proposta. Tal arquitetura permite iniciar uma cadeia de ações de gerenciamento em gerentes de nível mais baixo baseados em Web Services através de uma única requisição Web Service. Para definir novas composições, uma ferramenta Web foi desenvolvida, a qual gera automaticamente o código WS-BPEL. Além disso, foram realizadas avaliações de desempenho para verificar o impacto na rede das composições. Os resultados obtidos mostraram que composições podem reduzir o tráfego gerado na rede junto à estação de gerenciamento, pois permitem concentrar diversas informações em uma única requisição Web Services. O tempo de resposta também pôde ser reduzido em algumas situações devido às requisições nativamente paralelas do WS-BPEL. / In the recent years, the Web Services technology has been researched in many areas of computer science, including computers network management. Service composition, a new feature recently raised, seems to have the potentiality to solve several problems in computer science, including the network management field and its Simple Network Management Protocol (SNMP). Through service composition, it is possible to build up more sophisticated services using simpler services as components. Therefore, this work aims at investigating Web Services composition applied to network management. Towards this goal, models and standards for composition were reviewed and a WS-BPEL-based composition architecture devoted to management was proposed. Such architecture allows starting a chain of management actions on lowerlevel Web Services-based managers through only one Web Services request. In order to define new compositions, a Web-based tool was developed to automatically generate the WS-BPEL required code. In addition, performance evaluations were carried out in order to verify the compositions’ impact on the managed network. The results showed that compositions can reduce the management traffic in the surroundings of the management station by aggregating several information in only one Web Services request. Response time could also be decreased in some situations due to the native parallel requests of WS-BPEL.

The subject of this research is to find a continuous solution, which allows the description, the creation, the provisioning, and the execution of value-added telecommunication services. This work proposes a framework for an easy and timesaving creation and provisioning of value-added telecommunication services in Next Generation Networks. As research method, feasibility, comparative methods are used in this study. Criteria and requirements for service description, service creation, service execution, and service provisioning, are defined and existing technologies are compared with each other and evaluated regarding these criteria and requirements. Extensions to the selected technologies are proposed and possibilities to combine these technologies are researched. From the results of the previous steps, a framework is defined which offers a continuous solution for the description, creation, provisioning and execution of value-added services. In order to test the proof of concept, this framework is prototypically implemented. For a qualitative analysis of the research targets and the proof of concept, an example service is created and executed within the framework prototype. Furthermore, in order to examine the validity of the quantitative aims and objectives of this research work, a second example service is created, and its characteristics are measured and analysed. The result of this research is a novel continuous approach for the creation of value-added telecommunication services. This research introduces new possibilities for the service description, service creation, service provisioning, and service execution through an extension of the common telecommunication real-time execution environment JAIN SLEE. Value-added services are described by using the business process execution language BPEL. This language facilitates a simple and fast service design. The service can automatically be composed from pre-defined and pre-deployed components.

Factory shop floors of the future will see a significant increase in interconnected devices for monitoring and control. However, if a Service Orientated Architecture (SOA) is implemented on all such devices then this will result in a large number of permutations of services and composite services. These services combined with other business level components can pose a huge challenge to manage as it is often difficult to keep an overview of all the devices, equipment and services. This thesis proposes an SOA based novel assimilation architecture for integrating disparate industrial hardware based processes and business processes of an enterprise in particular the plastics machinery environment. The key benefits of the proposed architecture are the reduction of complexity when integrating disparate hardware platforms; managing the associated services as well as allowing the Micro Injection Moulding (µIM) process to be monitored on the web through service and data integration. An Enterprise Service Bus (ESB) based middleware layer integrates the Wireless Sensor Network (WSN) based environmental and simulated machine process systems with frontend Google Gadgets (GGs) based web visualisation applications. A business process framework is proposed to manage and orchestrate the resulting services from the architecture. Results from the analysis of the WSN kits in terms of their usability and reliability showed that the Jennic WSN was easy to setup and had a reliable communication link in the polymer industrial environment with the PER being below 0.5%. The prototype Jennic WSN based µIM process monitoring system had limitations when monitoring high-resolution machine data, therefore a novel hybrid integration architecture was proposed. The assimilation architecture was implemented on a distributed server based test bed. Results from test scenarios showed that the architecture was highly scalable and could potentially allow a large number of disparate sensor based hardware systems and services to be hosted, managed, visualised and linked to form a cohesive business process.

Factory shop floors of the future will see a significant increase in interconnected devices for monitoring and control. However, if a Service Orientated Architecture (SOA) is implemented on all such devices then this will result in a large number of permutations of services and composite services. These services combined with other business level components can pose a huge challenge to manage as it is often difficult to keep an overview of all the devices, equipment and services. This thesis proposes an SOA based novel assimilation architecture for integrating disparate industrial hardware based processes and business processes of an enterprise in particular the plastics machinery environment. The key benefits of the proposed architecture are the reduction of complexity when integrating disparate hardware platforms; managing the associated services as well as allowing the Micro Injection Moulding (µIM) process to be monitored on the web through service and data integration. An Enterprise Service Bus (ESB) based middleware layer integrates the Wireless Sensor Network (WSN) based environmental and simulated machine process systems with frontend Google Gadgets (GGs) based web visualisation applications. A business process framework is proposed to manage and orchestrate the resulting services from the architecture. Results from the analysis of the WSN kits in terms of their usability and reliability showed that the Jennic WSN was easy to setup and had a reliable communication link in the polymer industrial environment with the PER being below 0.5%. The prototype Jennic WSN based µIM process monitoring system had limitations when monitoring high-resolution machine data, therefore a novel hybrid integration architecture was proposed. The assimilation architecture was implemented on a distributed server based test bed. Results from test scenarios showed that the architecture was highly scalable and could potentially allow a large number of disparate sensor based hardware systems and services to be hosted, managed, visualised and linked to form a cohesive business process.

Made available in DSpace on 2016-06-02T19:06:20Z (GMT). No. of bitstreams: 1 6487.pdf: 4389000 bytes, checksum: edf86e96bdd00fe803ba1a23f55f6484 (MD5) Previous issue date: 2014-11-17 / Business Process Management emerged as a means for managing and improving business processes. However providing efficient business processes can demand high costs due to the need of software, hardware, and technical support. Cloud Computing emerged as a means for providing a fast and cheap way of acquiring computational resources in a pay-per-use manner, and can be employed for achieving efficient business processes with low costs. However, due to safety requirements, certain data or activities of a business process should be kept within the user premises, while others can be allocated to a cloud. This master dissertation presents a generic approach for decomposing business process taking into account costs, performance and safety requirements, thus granting greater reliability in the use of cloud resources. This approach is illustrated by means of a case study in the Healthcare domain. / Gerenciamento de Processos de Negócio emergiu como um meio para gerenciar e aperfeiçoar processos de negócio continuamente. Entretanto, fornecer tais processos de maneira eficiente pode demandar altos investimentos devido às necessidades de software, hardware e suporte técnico. Computação em Nuvem emergiu como um meio para prover uma forma rápida e barata de adquirir recursos computacionais com pagamento sob demanda, e pode ser aplicada para disponibilizar processos de negócio eficientes e com baixo custo. Entretanto, devido a requisitos de segurança, certos dados ou atividades de um processo de negócio devem ser mantidos na premissa do usuário, enquanto outros podem ser alocados em uma nuvem computacional. Esta dissertação de mestrado apresenta uma abordagem genérica para a decomposição de processos de negócio, que leva em conta custos, desempenho e requisitos de segurança, outorgando assim uma maior confiabilidade no uso de recursos de nuvens computacionais. Essa abordagem é ilustrada através de um estudo de caso no domínio da Saúde.

Orientador: Mauricio Ferreira Magalhães / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-08T01:16:08Z (GMT). No. of bitstreams: 1 Nader_MarcosVaninePortilhode_M.pdf: 1214383 bytes, checksum: 40e83a8be1c7e86e788d810a8799f6b8 (MD5) Previous issue date: 2006 / Resumo: Duas áreas importantes estão em desenvolvimento: Gerência de Processos de Negócios (Business Process Management) e Orquestração de Web Services (Web Services Orchestration). Ambas têm um objetivo que é integrar aplicações ou outros processos que tenham interfaces web services, usando o paradigma de processos de negócios. Uma linguagem que vem sendo difundida para essas aplicações é a BPEL (Business Process Execution Language). Este trabalho apresenta um framework aplicável à análise e verificação de processos de negócios escritos em BPEL através do uso de Pi-Calculus. Pi-Calculus é uma álgebra de processos que possui mecanismos formais para criação e ativação de processos que se comunicam através da troca de mensagens em canais, usando o modelo de rendezvous síncrono. Nesse framework, o processo BPEL é traduzido para um programa Pi-Calculus. Uma Máquina Virtual Pi-Calculus (MVP) recebe o programa Pi-Calculus e produz todas as reações possíveis, ou seja, gera todos os caminhos de execução que o programa pode seguir. A partir desse resultado, efetua-se a verificação de propriedades como: atendimento às especificações de mais alto nível, ordenação de eventos e ocorrência ou não de deadlocks. Em termos práticos, uma ferramenta desse tipo pode ser incorporada aos Sistemas de Gerência de Processos de Negócios (Business Process Management Systems - BPMS) para ampliar a cobertura de testes durante as fases de análise e implementação de um processo dentro do seu ciclo de vida. Nesses tipos de sistemas, a reparação de um erro durante a fase de execução é muito mais custosa que nos sistemas tradicionais / Abstract: Two important areas have been in development lately: Business Process Management and Web Service Orchestration. In both of them, the objective is to integrate applications with web services interface through business process paradigm. A number of languages have been proposed with consensus being formed around BPEL (Business Process Execution Language). This dissertation presents a framework for BPEL processes analysis and verification through Pi-Calculus. Pi-Calculus is a process algebra with formal mechanisms for processes creation and activation; these processes communicate sending and receiving messages through channels using the synchronous rendezvous model. In this framework, the BPEL process is translated to a Pi-Calculus program, A Pi-Calculus Virtual Machine (MVP) receives a Pi-calculus program and executes all possible reactions, that is, it generates all execution paths possible to be taken. With this result, the properties such as high-level specification accomplishment, events ordering and deadlock freedom are verified. In practical terms, a tool of this sort can be part of a Business Process Management System (BPMS) to broaden test coverage during the analysis and implementation phases within a process life cycle. In these kinds of systems, a repairing mistake during the execution phase is more complex than in traditional systems / Mestrado / Engenharia de Computação / Mestre em Engenharia Elétrica

Over the last years, Web services have become increasingly popular. It is because they allow businesses to share data and business process (BP) logic through a programmatic interface across networks. In order to reach the full potential of Web services, they can be combined to achieve specifi c functionalities. Web services run in complex contexts where arising events may compromise the quality of the system (e.g. a sudden security attack). As a result, it is desirable to count on mechanisms to adapt Web service compositions (or simply called service compositions) according to problematic events in the context. Since critical systems may require prompt responses, manual adaptations are unfeasible in large and intricate service compositions. Thus, it is suitable to have autonomic mechanisms to guide their self-adaptation. One way to achieve this is by implementing variability constructs at the language level. However, this approach may become tedious, difficult to manage, and error-prone as the number of con figurations for the service composition grows. The goal of this thesis is to provide a model-driven framework to guide autonomic adjustments of context-aware service compositions. This framework spans over design time and runtime to face arising known and unknown context events (i.e., foreseen and unforeseen at design time) in the close and open worlds respectively. At design time, we propose a methodology for creating the models that guide autonomic changes. Since Service-Oriented Architecture (SOA) lacks support for systematic reuse of service operations, we represent service operations as Software Product Line (SPL) features in a variability model. As a result, our approach can support the construction of service composition families in mass production-environments. In order to reach optimum adaptations, the variability model and its possible con figurations are verifi ed at design time using Constraint Programming (CP). At runtime, when problematic events arise in the context, the variability model is leveraged for guiding autonomic changes of the service composition. The activation and deactivation of features in the variability model result in changes in a composition model that abstracts the underlying service composition. Changes in the variability model are refl ected into the service composition by adding or removing fragments of Business Process Execution Language (WS-BPEL) code, which are deployed at runtime. Model-driven strategies guide the safe migration of running service composition instances. Under the closed-world assumption, the possible context events are fully known at design time. These events will eventually trigger the dynamic adaptation of the service composition. Nevertheless, it is diffi cult to foresee all the possible situations arising in uncertain contexts where service compositions run. Therefore, we extend our framework to cover the dynamic evolution of service compositions to deal with unexpected events in the open world. If model adaptations cannot solve uncertainty, the supporting models self-evolve according to abstract tactics that preserve expected requirements. / Alférez Salinas, GH. (2013). Achieving Autonomic Web Service Compositions with Models at Runtime [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34672 / TESIS