Thesis (M.Sc.)--Acadia University, 1999. / Includes bibliographical references (leaves 88-89). Also available on the Internet via the World Wide Web.

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The way in which application systems and software are built has changed dramatically over the past few years. This is mainly due to advances in hardware technology, programming languages, as well as the requirement to build better software application systems in less time. The importance of mondial (worldwide) communication between systems is also growing exponentially. People are using network-based applications daily, communicating not only locally, but also globally. The Internet, the global network, therefore plays a significant role in the development of new software. Distributed object computing is one of the computing paradigms that promise to solve the need to develop clienVserver application systems, communicating over heterogeneous environments. This study, of limited scope, concentrates on one crucial element without which distributed object computing cannot be implemented. This element is the communication software, also called middleware, which allows objects situated on different hardware platforms to communicate over a network. Two of the most important middleware standards for distributed object computing today are the Common Object Request Broker Architecture (CORBA) from the Object Management Group, and the Distributed Component Object Model (DCOM) from Microsoft Corporation. Each of these standards is implemented in commercially available products, allowing distributed objects to communicate over heterogeneous networks. In studying each of the middleware standards, a formal way of comparing CORBA and DCOM is presented, namely meta-modelling. For each of these two distributed object infrastructures (middleware), meta-models are constructed. Based on this uniform and unbiased approach, a comparison of the two distributed object infrastructures is then performed. The results are given as a set of tables in which the differences and similarities of each distributed object infrastructure are exhibited. By adopting this approach, errors caused by misunderstanding or misinterpretation are minimised. Consequently, an accurate and unbiased comparison between CORBA and DCOM is made possible, which constitutes the main aim of this dissertation. / Computing / M. Sc. (Computer Science)

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The way in which application systems and software are built has changed dramatically over the past few years. This is mainly due to advances in hardware technology, programming languages, as well as the requirement to build better software application systems in less time. The importance of mondial (worldwide) communication between systems is also growing exponentially. People are using network-based applications daily, communicating not only locally, but also globally. The Internet, the global network, therefore plays a significant role in the development of new software. Distributed object computing is one of the computing paradigms that promise to solve the need to develop clienVserver application systems, communicating over heterogeneous environments. This study, of limited scope, concentrates on one crucial element without which distributed object computing cannot be implemented. This element is the communication software, also called middleware, which allows objects situated on different hardware platforms to communicate over a network. Two of the most important middleware standards for distributed object computing today are the Common Object Request Broker Architecture (CORBA) from the Object Management Group, and the Distributed Component Object Model (DCOM) from Microsoft Corporation. Each of these standards is implemented in commercially available products, allowing distributed objects to communicate over heterogeneous networks. In studying each of the middleware standards, a formal way of comparing CORBA and DCOM is presented, namely meta-modelling. For each of these two distributed object infrastructures (middleware), meta-models are constructed. Based on this uniform and unbiased approach, a comparison of the two distributed object infrastructures is then performed. The results are given as a set of tables in which the differences and similarities of each distributed object infrastructure are exhibited. By adopting this approach, errors caused by misunderstanding or misinterpretation are minimised. Consequently, an accurate and unbiased comparison between CORBA and DCOM is made possible, which constitutes the main aim of this dissertation. / Computing / M. Sc. (Computer Science)

Orientador: Eleri Cardozo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-07-26T08:33:51Z (GMT). No. of bitstreams: 1 Oliveira_EduardoJacob_M.pdf: 7451976 bytes, checksum: be31a9be0d9d9c5f7aaa369f9c4010aa (MD5) Previous issue date: 1999 / Resumo: Nos últimos anos o mercado de telecomunicações tem passado por mudanças profundas devido a fatores como desregulamentação, aumento da competição entre as operadoras e aumento da demanda para o oferecimento de novos serviços, mais avançados e complexos. Entretanto, a introdução desses novos serviços, no âmbito de telecomunicações, encontra uma forte barreira em uma infra-estrutura que tem sido voltada para a conexão de usuários, e não para o oferecimento de serviços. O consórcio TINA (Telecommunications Information Networking Architecture) define uma arquitetura de sojtware para serviços de telecomunicações, norteada por conceitos de "re-uso" de componentes de sojtware, transparência de distribuição e utilização de padrões abertos, visando o desenvolvimento e gerência de serviços de qualquer complexidade. Por sua vez, o crescimento da World Wide Web (WWW) na Internet, a partir de meados desta década, popularizou o uso dos browsers Web no acesso aos serviços de informação e comunicação, tornando-os padrão de facto para a interface e interação com o usuário, assim como peça-chave no desenvolvimento de aplicações. Este trabalho apresenta uma arquitetura para acesso a serviços de telecomunicações baseada nos conceitos da Arquitetura de Serviço TINA e implementada utilizando as tecnologias Web e de objetos distribuídos, por meio de uma plataforma CORBA (Common Object Request Broker A rchitecture ). ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital / Abstract: The telecommunications market has experienced dramatic changes pushed by factors such as deregulation, competition between operators, and the increasing demand for more advanced and complex services. However, the introduction of these new services is limited by the current telecommunications infrastructure, that was designed to connect end users, not to offer services to them. The Telecommunications Information Networking Architecture (TINA) consortium defines acommon software architecture for providing telecommunications services, using concepts of "reuse" of software components, distribution transparency, and open standards, and aiming at the implementation and management of services of any complexity. On the other hand, the explosion of the World Wide Web (WWW) in the Internet since the middle of the 90's has popularized the Web browsers as an access mechanism to information and communication services. Web browsers have become the de facto standard for interfacing and interacting with the user and a key tool for. the development of applications. ...Note: The complete abstract is available with the full electronic digital thesis or dissertations / Mestrado / Mestre em Engenharia Elétrica

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