While developing modern applications, it is necessary to ensure an efficient and performant communication between different applications. In current environments, a middleware software is used, which supports the publish/subscribe communication pattern. Using this communication pattern, a publisher sends information encapsulated in messages to the middleware. A subscriber registers its interests at the middleware. The monograph describes three different steps to determine the performance of such a system. In a first step, the message throughput performance of a publish/subscribe in different scenarios is measured using a Java Message Service (JMS) based implementation. In the second step the maximum achievable message throughput is described by adapted models depending on the filter complexity and the replication grade. Using the model, the performance characteristics of a specific system in a given scenario can be determined. These numbers are used for the queuing model described in the third part of the thesis, which supports the dimensioning of a system in realistic scenarios. Additionally, we introduce a method to approximate an M/G/1 system numerically in an efficient way, which can be used for real time analysis to predict the expected performance in a certain scenario. Finally, the analytical model is used to investigate different possibilities to ensure the scalability of the maximum achievable message throughput of the overall system. / Bei der Entwicklung moderner Applikationen ist es notwendig eine effiziente und performante Kommunikation zwischen den einzelnen Anwendungen sicherzustellen. In der Praxis kommt dabei eine Middleware Software zum Einsatz, die das Publish/Subscribe Kommunikationsmuster unterstützt. Dabei senden Publisher Informationen in Form von Nachrichten an die Middleware. Die Subscriber hingegen zeigen durch die Nutzung von Filtern der Middleware an, welche Informationen zugestellt werden sollen. Die Arbeit beschreibt ein dreistufiges Verfahren zur Leistungsbestimmung eines solchen Systems. Zunächst wird durch Messung die Leistung von Publish/Subscribe Systemen in verschiedenen Szenarien untersucht am Beispiel von Java Message Service (JMS) basierten Implementierungen. Danach wird der maximale Nachrichtendurchsatz in Abhängigkeit der Filterkomplexität und des Nachrichtenreplikationsgrades durch einfache Modelle beschrieben. Damit können die Leistungskennwerte für ein System und vorgegebenen Randbedingungen beschrieben werden. Im dritten Teil wird mittels Leistungsbewertung und durch Anwendung eines Warteschlangenmodells die Leistung in praxisnahen Umfeld beschrieben, so dass eine Dimensionierung möglich wird. Zusätzlich wird ein mathematisch, approximatives Verfahren vorgestellt, um ein M/G/1 System numerisch effizient berechnen zu können, was bei der Echtzeitbewertung eines Systems zur Leistungsvorhersage benutzt werden kann. Des Weiteren werden mittels des Modells Möglichkeiten untersucht die Skalierbarkeit des Gesamtsystems in Bezug auf den Nachrichtendurchsatz sicherzustellen.

Este trabalho mostra o desenvolvimento de um software, rotulado aqui como SimuPi, para simular o modelamento matemático de elementos sensores piezoresistivos. O programa desenvolvido roda modelos de primeira e segunda ordem, clássicos da literatura, os quais são indispensáveis para o desenvolvimento de elementos sensores baseados no efeito piezoresistivo do silício. Foram analisadas as principais características de programas simuladores com objetivo de observar quais seriam relevantes para serem empregadas no desenvolvimento deste trabalho. Estudou-se a forma de elaboração do programa, escolhendo sua linguagem de programação e elaborando seus diagramas detalhados de requisitos e de funcionamentos. A plataforma de testes foi desenvolvida na linguagem de programação Java. O SimuPi mostrou-se condizente com a sua proposta, apresentando gráficos e resultados equivalentes aos obtidos em testes laboratoriais a partir da análise das propriedades do silício com base em modelos matemáticos. O software pode ser ampliado para projetos de elementos sensores usando outros tipos de materiais, além de melhorias gráficas e didáticas. / 81 f.

Um espaço de tuplas tem como função criar uma abstração de memória compartilhada sobre um sistema distribuído. Por propiciar modelos de programação muito simples e com baixo acoplamento entre os elementos do sistema, espaços de tuplas têm sido empregados na construção de sistemas distribuídos complexos. O espaço de tuplas JavaSpaces é um dos mais populares espaços de tuplas para a linguagem Java. Ele tem como características relevantes a conformidade a objetos, a persistência e o emprego de transações. As atuais implementações de JavaSpaces apresentam restrições como: complexidade de configuração, limitação de alcance e não serem abertas. Por “complexidade de configuração" entende-se ter que usar boa parte da infra-estrutura Jini (feita para facilitar o desenvolvimento e administração de sistemas distribuídos) e o Remote Method Invocation (mecanismo de chamadas remotas padrão no ambiente Java), mesmo quando eles seriam dispensáveis. Por "limitação de alcance", entende-se não poder usar as implementações sobre redes amplas, como a Internet. Por “não ser aberto" entende-se que: ou o código fonte não está disponível ou o código fonte e o aplicativo são distribuídos por licenças de software proprietárias ou o uso do software requer algum componente proprietário. Um projeto de espaço de tuplas em conformidade com a especificação JavaSpaces e que busca contornar as restrições acima é apresentado neste trabalho. São destaques do projeto proposto: 1. Dispensar o Remote Method Invocation pois utiliza sockets diretamente; 2. Implementar a persistência sobre bases de dados relacionais; 3. Suscitar o emprego de um mecanismo direto para obtenção de proxies Jini. As características 1 e 3 simplificam a configuração do espaço de tuplas e viabilizam o seu emprego da Internet. A característica 2 viabiliza uma implementação baseada em software aberto. Um protótipo foi implementado para verificar as idéias propostas.

by Wan Lai Man. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 76-80). / Abstract also in Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Background --- p.1 / Chapter 1.2 --- Objectives --- p.3 / Chapter 1.3 --- Contributions --- p.4 / Chapter 1.4 --- Overview --- p.4 / Chapter 2 --- Literature Review --- p.6 / Chapter 2.1 --- Message Passing Interface --- p.6 / Chapter 2.1.1 --- Point-to-Point Communication --- p.7 / Chapter 2.1.2 --- Persistent Communication Request --- p.8 / Chapter 2.1.3 --- Collective Communication --- p.8 / Chapter 2.1.4 --- Derived Datatype --- p.9 / Chapter 2.2 --- Communications in Java --- p.10 / Chapter 2.2.1 --- Object Serialization --- p.10 / Chapter 2.2.2 --- Remote Method Invocation --- p.11 / Chapter 2.3 --- Performances Issues in Java --- p.11 / Chapter 2.3.1 --- Byte-code Interpreter --- p.11 / Chapter 2.3.2 --- Just-in-time Compiler --- p.12 / Chapter 2.3.3 --- HotSpot --- p.13 / Chapter 2.4 --- Parallel Computing in Java --- p.14 / Chapter 2.4.1 --- JavaMPI --- p.15 / Chapter 2.4.2 --- Bayanihan --- p.15 / Chapter 2.4.3 --- JPVM --- p.15 / Chapter 3 --- Infrastructure --- p.17 / Chapter 3.1 --- Layered Model --- p.17 / Chapter 3.2 --- Java Parallel Environment --- p.19 / Chapter 3.2.1 --- Job Coordinator --- p.20 / Chapter 3.2.2 --- HostApplet --- p.20 / Chapter 3.2.3 --- Formation of Java Parallel Environment --- p.21 / Chapter 3.2.4 --- Spawning Processes --- p.24 / Chapter 3.2.5 --- Message-passing Mechanism --- p.28 / Chapter 3.3 --- Application Programming Interface --- p.28 / Chapter 3.3.1 --- Message Routing --- p.29 / Chapter 3.3.2 --- Language Binding for MPI in Java --- p.31 / Chapter 4 --- Programming in JMPI --- p.35 / Chapter 4.1 --- JMPI Package --- p.35 / Chapter 4.2 --- Application Startup Procedure --- p.37 / Chapter 4.2.1 --- MPI --- p.38 / Chapter 4.2.2 --- JMPI --- p.38 / Chapter 4.3 --- Example --- p.39 / Chapter 5 --- Processes Management --- p.42 / Chapter 5.1 --- Background --- p.42 / Chapter 5.2 --- Scheduler Model --- p.43 / Chapter 5.3 --- Load Estimation --- p.45 / Chapter 5.3.1 --- Cost Ratios --- p.47 / Chapter 5.4 --- Task Distribution --- p.49 / Chapter 6 --- Performance Evaluation --- p.51 / Chapter 6.1 --- Testing Environment --- p.51 / Chapter 6.2 --- Latency from Java --- p.52 / Chapter 6.2.1 --- Benchmarking --- p.52 / Chapter 6.2.2 --- Experimental Results in Computation Costs --- p.52 / Chapter 6.2.3 --- Experimental Results in Communication Costs --- p.55 / Chapter 6.3 --- Latency from JMPI --- p.56 / Chapter 6.3.1 --- Benchmarking --- p.56 / Chapter 6.3.2 --- Experimental Results --- p.58 / Chapter 6.4 --- Application Granularity --- p.62 / Chapter 6.5 --- Scheduling Enable --- p.64 / Chapter 7 --- Conclusion --- p.66 / Chapter 7.1 --- Summary of the thesis --- p.66 / Chapter 7.2 --- Future work --- p.67 / Chapter A --- Performance Metrics and Benchmark --- p.69 / Chapter A.1 --- Model and Metrics --- p.69 / Chapter A.1.1 --- Measurement Model --- p.69 / Chapter A.1.2 --- Performance Metrics --- p.70 / Chapter A.1.3 --- Communication Parameters --- p.72 / Chapter A.2 --- Benchmarking --- p.73 / Chapter A.2.1 --- Ping --- p.73 / Chapter A.2.2 --- PingPong --- p.74 / Chapter A.2.3 --- Collective --- p.74 / Bibliography --- p.76

The heritage of Java is the product of a complex mix of cultures that historically influenced the island: Hindu, Buddhist, Islamic, Javanese, Chinese, and Dutch. Indonesian cultural heritage is represented through many aspects of the nation; the history, the way of life, the identity which should be preserved not only for the present, but for the future. Unfortunately, Indonesian heritage faces many problems; many historic buildings have been demolished, neglected and not well maintained. Due to these facts, the effort should be done in order to save the heritage in Indonesia, and this can be achieved by maximizing the role of the community. The aim of this research is to describe the role of community participation in the religious heritage conservation management in Indonesia, and specifically looks at the case of Chinese temples and mosques in the urban coastal area of Java. The research is the result of extensive fieldwork that was carried out between 2009-2011 and both qualitative and quantitative methods were employed; survey questionnaires, observation and in-depth interviews. The final finding of the research is the model of the religious heritage management which is developed from the Chinese temples and mosques conservation strategy. The Focus Group Discussion was undertaken in the final step to get input from the stakeholders of the heritage conservation. This stage is needed to validate and verify the model before applying the model to other religious buildings. The findings of this research show the extent to which local communities are involved in temple and mosque activities and how their role is essential to the sustainability of their religious buildings. Because local community involvement still needs to be improved in Indonesia, this approach could be employed as an effective model for the conservation of other religious heritage buildings especially in Java, and hopefully later in the wider area of Indonesia.

Made available in DSpace on 2019-03-29T23:27:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-12-10 / This work presents a model for semi-automatic transformation of multi-thread applications into grid-enabled applications, focusing on algorithms that present communication and synchronization. The model uses Java threads and aspect-oriented programming to convert threads into grid tasks, maintaining the state of shared objects during the execution. In this work we also present performance and ease of use evaluation results. Keywords: Software Engineering, Distributed Systems, Grid Computing, Aspect Oriented Programming / Este trabalho apresenta um modelo para transformação semi-automática de aplicações multi-thread em aplicações para grades computacionais, focando em algoritmos com comunicação e sincronização entre tarefas. O modelo utiliza Java threads e programação orientada a aspectos para converter threads em tarefas para a grade, mantendo o estado de objetos compartilhados durante a execução. Neste trabalho apresentamos ainda resultados de avaliações de desempenho e facilidade de uso do modelo. Palavras-chave: Engenharia de Software, Sistemas Distribuídos, Computação em Grade, Programação Orientada a Aspectos

Wong, Yuk Yin. / "December 2002." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (p. 193-206). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

Pro potřebu kontroly kvality kódu v Javě lze jednak využít funkce vývojového prostředí, ale také i samostatné programy, které kvalitu kódu hlídají - analyzéry kódu. Ty lze použít v podobě pluginů pro vývojová prostředí. V této práci jsem se primárně zaměřoval na vývojová prostředí NetBeans a Eclipse a jejich podporu pro různé analyzéry kódu (FindBugs, PMD, atd.) z oblasti open source. Práce se zabývá analýzou kontroly kvality ve vývojových prostředích a analyzérech kódu.

Estágio realizado na INDRA Sistemas Portugal, S.A. e orientado pelo Doutor Vasco Miguel Fernandes Cação / Tese de mestrado integrado. Engenharia Informátca e Computação. Faculdade de Engenharia. Universidade do Porto. 2008

Estágio realizado naTelbit e orientado pelo Eng.º José Pedro Tavares / Tese de mestrado integrado. Engenharia Informática e Computação. Faculdade de Engenharia. Universidade do Porto. 2009