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INFORMATION PROCESSING LETTERS 2001年第2-4期77卷 143-150页

作者： James, J Singh, AK Univ Kansas Dept EECS Lawrence KS 66045 USA Univ Calif Santa Barbara Dept Comp Sci Santa Barbara CA 93106 USA

distributed multithreaded applications operating in shared-nothing environments present challenges to classical fault tolerance mechanisms. The piecewise determinism assumption is lost (due to multithreading), and data must be replicated (because of the shared-nothing environment). In this paper, we explore a systematic approach to providing fault tolerance, by considering data-race-free programs that have the benefits of piecewise determinism and yet allow multithreading. We base our logging and recovery algorithm on a logical ring structure that allows the underlying distributed system to migrate threads, migrate and replicate objects, and perform multi-object transactions. (C) 2001 Elsevier Science B.V. All rights reserved.

关键词： distributed systems distributed objects fault tolerance logging

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Using distributed objects to build the Stanford Digital Library Infobus

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COMPUTER 1999年第2期32卷 80-+页

作者： Paepcke, A Baldonado, MQW Chang, CCK Cousins, S Garcia-Molina, H Stanford Univ Dept Comp Sci Stanford CA 94305 USA Stanford Digital Lib Project Stanford CA USA Stanford Univ Dept Elect Engn Stanford CA 94305 USA

For digital libraries to thrive, the providers of information and information processing services must be able to evolve their systems autonomously. However, as the complexity of their offerings increases, software tools more sophisticated than existing Web facilities are needed. distributed object technology may be the answer. The availability of high-volume, increasingly sophisticated information is making the need for metadata facilities more urgent. Traditional, library-based approaches break down when used in an advanced digital library. More modular mechanisms are needed, and the CORBA system is one approach. Digital libraries are affected at a deep technical level by the widely differing user traditions of Web users and library patrons. The challenge and opportunity of digital libraries will be the synthesis of these traditions. Four pears ago the authors of this article set out to create a technical infrastructure to support the construction of digital libraries. In their view a digital library comprises widely distributed resources that can be maintained autonomously by different organizations and will not require adherence to uniform interfaces.

关键词： CORBA Infobus Internet Stanford digital library World Wide Web digital libraries distributed object management distributed objects information processing services information resources library patrons metadata software tools technical infrastructure user traditions

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Web services versus distributed objects: A case study of performance and interface design

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INTERNATIONAL JOURNAL OF WEB SERVICES RESEARCH 2007年第3期4卷 49-64页

作者： Cook, William R. Barfield, Janel Univ Texas Dept Comp Sci Austin TX 78712 USA

Web services are promoted as a new model for distributed systems, yet many skeptics see them as simply a poor implementation of traditional remote procedure calls (RPC) or distributed objects. Previous comparisons, which show Web services to be significantly slower than RPC, are biased because they use a RPC communication style and ignore the document-oriented style that is recommended for Web services. We compare the straightforward design and implementation of a small file server application implemented using proxy-based RMI and document-oriented Web services. We show that Web services outperform RMI when accessing multiple/deeply nested files, especially over high-latency networks. However, the automatically generated Web service interfaces are awkward to use, so we develop a technique for wrapping the Web service to make it as easy to use as the distributed object implementation. This case study provides a more detailed comparison of the relationship between Web services and distributed objects.

关键词： case study distributed objects performance RMI Web services

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On the performance of distributed objects

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JOURNAL OF SYSTEMS ARCHITECTURE 2000年第5期46卷 411-428页

作者： Venkatesulu, D Gonsalves, TA Hariram, RK Indian Inst Technol Dept Comp Sci & Engn Madras 600036 Tamil Nadu India

Early distributed shared memory systems used the shared virtual memory approach with fixed-size pages, usually 1-8 KB. As this does not match the variable granularity of sharing of most programs, recently the emphasis has shifted to distributed object-oriented systems. With small object sizes, the overhead of inter-process communication could be large enough to make a distributed program too inefficient for practical use. To support research in this area, we have implemented a user-level distributed programming testbed, DIPC, that provides shared memory, semaphores and barriers. We develop a computationally-efficient model of distributed shared memory using approximate queueing network techniques. The model can accommodate several algorithms including central server, migration and read-replication. These models have been carefully validated against measurements on our distributed shared memory testbed. Results indicate that for large granularities of sharing and small access bursts, central server performs better than both migration and read-replication algorithms. Read-replication performs better than migration for small and moderate object sizes for applications with high degree of read-sharing and migration performs better than read-replication for large object sizes for applications having moderate degree of read-sharing. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

关键词： distributed shared memory distributed semaphore distributed barrier mean value analysis queueing network model distributed objects

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An architectural view of distributed objects and components in CORBA, Java RMI and COM/DCOM

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SOFTWARE-CONCEPTS AND TOOLS 1998年第1期19卷 14-28页

作者： Plasil, F Stal, M Charles Univ Fac Math & Phys Dept Software Engn Prague 11800 1 Czech Republic Siemens AG Corp Technol Dept ZT SE 1 D-80312 Munich Germany

The goal of this paper is to provide an architectural analysis of the existing distributed object oriented platforms. Based on a relatively small number of design patterns, our analysis aims at a unified view of the platforms. We achieve this by articulating a series of key issues to be addressed in analyzing a particular platform. This approach is applied systematically to the CORBA, Java RMI and COM/DCOM platforms.

关键词： CORBA Java RMI COM/DCOM distributed computing distributed objects design patterns software architecture

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A delegation-based approach for the unanticipated dynamic evolution of distributed objects

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JOURNAL OF SYSTEMS AND SOFTWARE 2009年第6期82卷 932-946页

作者： Sadou, Salah Mili, Hafedh Univ Quebec Dept Comp Sci Montreal PQ H3C 3P8 Canada Univ Bretagne Sud Valoria Res Lab Vannes France

Large information systems are typically distributed and cater to several client programs, with different needs. Traditional approaches to software development and deployment cannot handle situations where (i) the needs of one client application evolve over time, diverging from the needs of others, and (ii) when the server application cannot be shutdown for maintenance. In this paper, we propose an experimental framework for the unanticipated dynamic evolution of distributed objects that enables us to: (i) extend the behavior of distributed objects during run-time, requiring no shutdown, and (ii) offer different functionalities to different applications simultaneously. In our approach, new client programs can invoke behavioral extensions to server objects that are visible only to them, while legacy applications may continue to use the non-extended versions of the server. Our approach has the advantage of: (i) requiring no changes to the host programming language or to the virtual machine, and (ii) providing a transparent programming model to the developer. In this paper, we describe the problem of unanticipated dynamic evolution of distributed objects, the principles underlying our approach, and our prototype implementations for Java and C#. We conclude by discussing related work, and the extent to which our approach can be used to support industrial strength unanticipated evolution. (c) 2008 Elsevier Inc. All rights reserved.

关键词： Dynamic evolution distributed objects Unanticipated evolution Delegation Wrapper pattern

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A time cost model for distributed objects parallel computation

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FUTURE GENERATION COMPUTER SYSTEMS 2002年第6期18卷 807-812页

作者： Shevchenko, R Doroshenko, A NASU Inst Software Syst UA-13187 Kiev Ukraine Gradsoft Kiev Ukraine

A time cost model for parallel computation in CORBA-distributed objects is introduced and a methodology for enhancing performance of distributed applications is proposed. A new four-tiered architecture, against traditional three-tiered one, is derived form constructed cost model for Internet distributed applications. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： distributed objects parallel computation CORBA

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A messaging architecture for distributed objects in Oberon

A messaging architecture for distributed objects in Oberon

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Joint Modular Languages Conference (JMLC 97)

作者： Scherer, D ETH Zurich Comp Engn & Networks Lab TIK CH-8092 Zurich Switzerland

ISBN: (纸本)3540625992

A distributed messaging architecture built on top of current Oberon System 3 implementations is designed and implemented. It is aimed at supporting a CORBA-inspired object request broker architecture for distributed objects. The emphasis is on compatibility with System 3 messaging without requiring modifications of existing systems. Some Oberon-specific issues are identified which require workarounds in the solution, and proposals are also made for improved distributed messaging support in future systems. The implemented solution is presented in detail and uses a precompiler for message-specific communications procedure generation without restricting runtime flexibility for message types.

关键词： messages distributed objects Oberon System 3 CORBA

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Integration of enterprise resources planning software using design patterns and distributed objects technology

Integration of enterprise resources planning software using ...

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22nd International Conference on Information Technology Interfaces (ITI 2000)

作者： Vrcek, N Kermek, D Univ Zagreb Fac Org & Informat Varazdin 42000 Croatia

ISBN: (纸本)9539676916

Changes in business and information technology have made great impact on individual organisations. Enterprise resource planning (ERP) software has become something they suppose to have or will lose a race with competition that has already integrated ERP. This paper seeks to make a contribution to integrating of ERP with legacy applications but also to provide flexible mechanism for integrating new applications in the near future. We plan to expand our solution to few ERPs therefore it is designed for smooth transition to selected one. All sides of proposed solution (ERP, legacy and new applications) get their own wrapper whose responsibility is to facilitate encapsulation and flexibility. Our integration mechanism is distributed objects technology implemented through design patterns.

关键词： ERP design patterns distributed objects integration reengineering

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Construction of sensor network system for human behavior measurement and accumulation via distributed objects

Construction of sensor network system for human behavior mea...

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Sensor Fusion and Decentralized Control in Robotic Systems IV Conference

作者： Mori, T Noguchi, H Sato, T Univ Tokyo Grad Sch Informat Sci & Technol Dept Mechanoinformat Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)0819442992

This paper describes construction of sensor network system for human behavior measurement and accumulation in a room. The network system consists of three layers: a sensing layer, a process layer and integration layer. It is capable of distributed processing in each module which is a group of several sensors. The implemented system of "Robotic Room 2" based on distributed objects allows not only easy integration and accumulation of sensor information but also parallel execution of both integrated measurement and accumulation system.

关键词： human behavior measurement sensor network distributed objects

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