Academic literature on the topic 'Java/RMI Middleware'

DCOM, CORBA, dan Java RMI adalah middleware yang memungkinkan komputasi jarak jauh atau komputasi tersebar. Meskipun telah terdapat konsep layanan web dan implementasi yang diterapkan dalam berbagai kasus saat ini, ketiga middleware di atas masih sering digunakan untuk lingkungan yang application-specific, yang membutuhkan performa lebih baik. Paper ini diharapkan akan memberikan gambaran mengenai DCOM, CORBA, dan Java RMI dari konsep hingga perbedaan yang paling mendasar terkait teknik pemrograman. DCOM, CORBA, and Java RMI are middleware that enable remote computing (distributed computing). Although we have Web Service concept and implementation that applied in many cases right now, all three still often used for applications-specific nature, which need the better performance. This paper is intended to give an overview of DCOM, CORBA, and Java RMI, from concept to most fundamental differences related to programming techniques.

Networks of computers are everywhere. The Internet is one, as are the many networks of which it is composed. Mobile phone networks, corporate networks, factory networks, campus networks, home networks, in-car networks, both separately and in combination, all share the essential characteristics that make them relevant subjects for study under the heading distributed systems. Most organizations use a wide variety of applications for the smooth functioning of their businesses that includes homogenous as well as heterogeneous systems. Heterogeneous systems run on different platforms, use different technologies or sometimes even run on a different network architecture altogether. The essential role of Middleware is to provide a simple environment to manage complex, heterogeneous and distributed infrastructures. The main goal of this paper is to use Java-RMI middleware to build a distributed system for scheduling the threads. The system comprises two separate programs, a server, and a client. A typical server program creates some remote objects, makes references to these objects accessible, and waits for clients to invoke methods on these objects. A typical client program obtains a remote reference to one or more remote objects on a server and then invokes methods on them.

In recent years, there has been a growth in the amount of data used to improve the production processes. As a result, the cross communication and interaction between components has increased and became a key property of modern production system. To reduce the cost of communication and to increase the efficiency of these systems, middleware technology such as CORBA, COM+, Java RMI, and Web services are being used. Middleware is becoming more and more the essential factor in improving current Manufacturing Process Automation and Control Systems, and their applications have witnessed an increased demand in real time Manufacturing Distributed Applications. In this paper, we propose publish-subscribe middleware architecture based on the Data Distribution System (DDS) open standard. The proposed architecture aims to seamlessly integrate the existing heterogeneous manufacturing systems, such as SCADA system, DCS, PLCs, and databases; and improve the communication and real time data delivery among system components; also, it provides a QoS support layer between the communicating components. Furthermore, the proposed architecture is implemented and evaluated by intensive experiments.

This paper describes various aspects of web information management with particular emphasis on its application to electronic commerce. We first provide a brief overview of the web. Then we discuss concepts for web database management, as database management is a key part of information management. These include data models and architectures, query processing, transaction management, metadata management, storage issues, and integrity and security. Then we discuss various web information management technologies such as multimedia, visualization, data mining and warehousing, and knowledge management. Then we discuss emerging standards such as Java Database Connectivity, Extended Markup Language (XML), and middleware standards such as Object Request Brokers (ORB) and Remote Method Invocation (RMI). Finally we discuss how web data management technologies can be applied to the important area of electronic commerce.

Moderne, objektorientierte Sprachen spielen bei der Entwicklung von Software für eingebettete Systeme bislang kaum eine Rolle. Die Gründe hierfür sind vielfältig, meist wird jedoch die mangelnde Effizienz und der größere Speicherbedarf hervorgehoben. Obwohl Java viele Eigenschaften hat, die sehr für einen Einsatz in eingebetteten Systemen sprechen, so hängt doch gerade Java vielfach immer noch das Vorurteil an, in Systemen mit beschränkter Rechenleistung und Speicher zu viele Ressourcen zu benötigen. Diese Arbeit soll dazu beitragen, diese Vorurteile abzutragen. Sie stellt insbesondere Techniken vor, die den Speicherbedarf einer JVM so gering wie möglich halten und diese effizient mit der zur Verfügung stehenden Rechenleistung umgehen lassen. Viele der dargestellten Verfahren und Algorithmen wurden in der Kertasarie VM implementiert, einer virtuellen Maschine, die speziell für den Einsatz in eingebetteten Systemen konzipiert wurde. Durch die weit verbreitete Vernetzung eingebetteter Systeme über das Internet stellt sich in vielen Fällen zudem das Problem einer modernen, abstrakten und effizienten Form der Kommunikation. Aus diesem Grund liegt der zweite Schwerpunkt dieser Arbeit auf dem Vergleich von objektorientierten Middleware-Architekturen, insbesondere von Java-RMI. Auch auf diesem Gebiet wird eine eigene, speziell an eingebettete Systeme angepasste RMI-Variante vorgestellt
Modern, object oriented languages do not play an important role when developing software for embedded systems. There are many reasons for it, most often an inadequate performance and a greater memory demand are mentioned. In spite of the fact that Java has many features suitable for embedded systems, Java often faces the prejudice to consume too much resources in systems with limited processing power and memory. This work is a contribution to diminish this prejudices. It presents techniques to limit the memory demands of a Java Virtual Machine and to effectively cope with limited computing power. Many of the presented methods and algorithms are implemented in the Kertasarie VM, a JVM designed to run in embedded systems.Due to the fact of increasing network capabilities embedded systems often face the problem of a modern, abstract and efficient communication. Therefore the second emphasis of this work is put on the comparison of object oriented middleware architectures, especially Java-RMI. An own implementation for embedded systems is also presented

La diffusione di soluzioni domotiche dipende da tecnologie abilitanti che supportino la comunicazione tra i numerosi agenti delle reti. L’obiettivo della tesi è progettare e realizzare un middleware per sensori distribuiti Java-based chiamato SensorNetwork, che permetta ad un agente domotico di effettuare sensing sull’ambiente. Le funzionalità principali del sistema sono uniformità di accesso a sensori eterogenei distribuiti, alto livello di automazione (autoconfigurazione e autodiscovery dei nodi), configurazione a deployment time, modularità, semplicità di utilizzo ed estensione con nuovi sensori. Il sistema realizzato è basato su un’architettura a componente-container che permette l’utilizzo di sensori all’interno di stazioni di sensori e che supporti l’accesso remoto per mezzo di un servizio di naming definito ad-hoc.

Made available in DSpace on 2016-06-02T19:05:23Z (GMT). No. of bitstreams: 1 DissLAFB.pdf: 1617842 bytes, checksum: 0e04147b28caae9983df30e2b3a878bd (MD5) Previous issue date: 2006-12-14
This master thesis deals with the involved aspects for the creation of a framework for connectivity in JAMP (Java Architecture for Media Processing). The conception of this framework aims to make possible the use of mobile devices by means of other wireless network technologies. Such technologies, as Bluetooth, used for the publication/localization of services registered in the JBroker, the broker of JAMP Platform developed in Java/RMI, as well as the communication of devices that make use of such technologies through this broker, had been used in the implementation and tests of the framework developed. The implementation aims to access, from devices with Bluetooth network interface, the available remote services in the Internet. These services are requested by mobile devices, such as PDAs, cellular or smartphones, that they consult access points, in Bluetooth communication. The access points consult the JBroker that returns a reference for the service to be consumed. The access points then direct the result to the mobile devices. The experiments developed in this work had been based on scenes where a mobile device, in Bluetooth communication, requests services to a point of access in a PC and this, saw TCP/IP, invokes remote methods in the servers who disponibilizam the services, saw Java/RMI. JAMP already all presented the mechanism of localization of services saw Java/RMI, however it did not present the extension developed with this work, where they had been created one proxy, that it is executed in the access point, and the use of services of the JAMP to break mobile devices that if communicate through technology of different net of TCP/IP. Being thus, its innovation is in the capacity of use of devices that make use of technology of Bluetooth net, being able to be extended to other technologies, without needing would reengeneering previously existing in the architecture.
Esta dissertação de mestrado trata dos aspectos envolvidos para a criação de um framework de conectividade na JAMP (Java Architecture for Media Processing). A concepção desse framework tem por objetivo possibilitar a utilização de dispositivos móveis por meio de outras tecnologias de rede sem fio. Tais tecnologias, como Bluetooth, usadas para a publicação/localização de serviços registrados no JBroker, broker da Plataforma JAMP desenvolvido em Java/RMI, bem como a comunicação de dispositivos que dispõem de tal tecnologia, foram empregadas na implementação e testes do framework desenvolvido. A implementação visa ao acesso, a partir de dispositivos com interface de rede Bluetooth, a serviços remotos disponíveis na Internet. Esses serviços são requisitados por dispositivos móveis, tais como PDAs, celulares ou smartphones, que consultam pontos de acesso, via Bluetooth. Os pontos de acesso consultam o JBroker que retorna uma referência para o serviço a ser consumido. Os pontos de acesso então encaminham o resultado aos dispositivos móveis. Os experimentos desenvolvidos neste trabalho basearam-se no cenário onde um dispositivo móvel, em comunicação Bluetooth, requisita serviços a um ponto de acesso em um PC e este, via TCP/IP, invoca métodos remotos nos servidores que disponibilizam os serviços, via Java/RMI. A JAMP já apresentava todo o mecanismo de localização de serviços via Java/RMI, porém não apresentava a extensão desenvolvida neste trabalho. Nesta, foram criados um proxy, que é executado no ponto de acesso, e a utilização de serviços da JAMP a partir de dispositivos móveis que se comunicam através de tecnologia de rede diferente de TCP/IP. Sendo assim, sua inovação está na capacidade de utilização de dispositivos que dispõem de tecnologia de rede Bluetooth, podendo ser estendido a outras tecnologias, sem necessitar da reengenharia previamente existente na arquitetura

Moderne, objektorientierte Sprachen spielen bei der Entwicklung von Software für eingebettete Systeme bislang kaum eine Rolle. Die Gründe hierfür sind vielfältig, meist wird jedoch die mangelnde Effizienz und der größere Speicherbedarf hervorgehoben. Obwohl Java viele Eigenschaften hat, die sehr für einen Einsatz in eingebetteten Systemen sprechen, so hängt doch gerade Java vielfach immer noch das Vorurteil an, in Systemen mit beschränkter Rechenleistung und Speicher zu viele Ressourcen zu benötigen. Diese Arbeit soll dazu beitragen, diese Vorurteile abzutragen. Sie stellt insbesondere Techniken vor, die den Speicherbedarf einer JVM so gering wie möglich halten und diese effizient mit der zur Verfügung stehenden Rechenleistung umgehen lassen. Viele der dargestellten Verfahren und Algorithmen wurden in der Kertasarie VM implementiert, einer virtuellen Maschine, die speziell für den Einsatz in eingebetteten Systemen konzipiert wurde. Durch die weit verbreitete Vernetzung eingebetteter Systeme über das Internet stellt sich in vielen Fällen zudem das Problem einer modernen, abstrakten und effizienten Form der Kommunikation. Aus diesem Grund liegt der zweite Schwerpunkt dieser Arbeit auf dem Vergleich von objektorientierten Middleware-Architekturen, insbesondere von Java-RMI. Auch auf diesem Gebiet wird eine eigene, speziell an eingebettete Systeme angepasste RMI-Variante vorgestellt.
Modern, object oriented languages do not play an important role when developing software for embedded systems. There are many reasons for it, most often an inadequate performance and a greater memory demand are mentioned. In spite of the fact that Java has many features suitable for embedded systems, Java often faces the prejudice to consume too much resources in systems with limited processing power and memory. This work is a contribution to diminish this prejudices. It presents techniques to limit the memory demands of a Java Virtual Machine and to effectively cope with limited computing power. Many of the presented methods and algorithms are implemented in the Kertasarie VM, a JVM designed to run in embedded systems.Due to the fact of increasing network capabilities embedded systems often face the problem of a modern, abstract and efficient communication. Therefore the second emphasis of this work is put on the comparison of object oriented middleware architectures, especially Java-RMI. An own implementation for embedded systems is also presented.