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Developing a Consistent Domain-Oriented distributed Object Service

IEEE TRANSACTIONS ON PARALLEL AND distributed SYSTEMS 2009年第11期20卷 1567-1585页

作者： Georgiou, Chryssis Musial, Peter M. Shvartsman, Alexander A. Univ Cyprus Dept Comp Sci CY-1678 Nicosia Cyprus USN Postgrad Sch Dept Comp Sci Monterey CA 93943 USA Univ Connecticut Dept Comp Sci & Engn Storrs CT 06269 USA

This paper presents a new algorithm for a reconfigurable distributed domain-oriented atomic object service, called DO-RAMBO, which stands for Domain-Oriented Reconfigurable Atomic Memory for Basic objects. This service is suitable for inclusion as a middleware system service for distributed applications requiring atomic read/write data. The implementation substantially extends and refines the abstract RAMBO algorithm of Lynch and Shvartsman that supports individual atomic objects. In this paper, domains are introduced to allow the users to group related atomic objects. The new implementation manages configurations on the basis of domains, significantly improving the utility and the performance of the resulting service. DO-RAMBO guarantees consistency under asynchrony, message loss, node crashes, new node arrivals, and node departures. We present the formal algorithm development for DO-RAMBO and give analytical and empirical results that illustrate the benefit of the new approach.

关键词： distributed systems specifying and verifying and reasoning about programs algorithm and design analysis reliability and robustness

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Visible Nearest Neighbor Search for objects Moving on Consecutive Trajectories 15

Visible Nearest Neighbor Search for Objects Moving on Consec...

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15th IEEE international symposium on Parallel and distributed Processing with applications (ISPA) / 16th IEEE international Conference on Ubiquitous Computing and Communications (IUCC)

作者： Luo, Xinyuan Chen, Ke Pang, Guifeng Shou, Lidan Chen, Gang Zhejiang Univ Coll Comp Sci Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781538637906

A visible nearest neighbor (VNN) query returns the k nearest objects that are visible to a query point, which is used to support various applications such as route planning, target monitoring, and antenna placement. However, with the proliferation of wireless communications and advances in positioning technology for mobile equipments, efficiently searching for VNN among moving objects are required. While most previous work on VNN query focused on static objects, in this paper, we treats the objects as moving consecutively when indexing them, and study the visible nearest neighbor query for moving objects (MVNN). Assuming that the objects are represented as trajectories given by linear functions of time, we propose a scheme which indexes the moving objects by time-parameterized R-tree (TPR-tree) and obstacles by R-tree. The paper offers four heuristics for visibility and space pruning. New algorithms, Post-pruning and United-pruning, are developed for efficiently solving MVNN queries with all four heuristics. The effectiveness and efficiency of our solutions are verified by extensive experiments over synthetic datasets on real road network.

关键词： Nearest neighbor search Moving objects Visibility

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Parallel Initialization on distributed Simulation Systems 14

Parallel Initialization on Distributed Simulation Systems

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18th IEEE/ACM international symposium on distributed Simulation and Real Time applications (DS-RT)

作者： Menezes, Nilo Ney Coutinho Multitel ASBL Discrete Complex Syst Simulat Optimisat & Decis M B-7000 Mons Belgium

ISBN: (纸本)9781479961436

The initialization of distributed heterogeneous simulation systems presents challenges regarding the parallelization of object construction and setup. This paper presents a method for parallel initialization of distributed simulation systems that consists of a two phases setup. Object instantiation and setup are split in Config and Post Bind phases to permit fast creation times allowing distribution of initialization tasks among different nodes and removing the ordering requirement between the initialization of interdependent objects. A framework of references is presented to facilitate the use of remote objects in a MPI environment using proxies to access local and remote variables, served by a reference name server built into the simulation engine.

关键词： distributed simulation parallel initialization distributed configuration

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An Enhanced Dead Reckoning Model for Physics-Aware Multiplayer Computer Games 12

An Enhanced Dead Reckoning Model for Physics-Aware Multiplay...

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16th IEEE/ACM international symposium on distributed Simulation and Real Time applications

作者： McLoone, Seamus C. Walsh, Patrick J. Ward, Tomas E. Natl Univ Ireland Maynooth Dept Elect Engn Maynooth Kildare Ireland

ISBN: (纸本)9780769548463

Consistency is a key requirement of networked multiplayer computer games. Several methods exist that strive to reduce network traffic in an attempt to maintain an acceptable level of consistency. Currently, these methods update an entity's states based on measures of its spatial and temporal inconsistencies. However, these measures do not, in general, consider inconsistencies associated with the entity's interactions with other environmental objects, which can potentially lead to significance differences in what users see and experience. This is particularly evident in physics-aware, peer-to-peer distributed interactive applications such as networked multiplayer computer games. Thus, this paper proposes a novel entity state update technique for such applications. In doing so, the concept of a physics-consistency-cost is introduced. The proposed technique consists of a dynamic authority scheme for shared objects and an enhanced physics-aware dead reckoning model with an adaptive error threshold. The former places a bound on the overall inconsistency present in shared objects, while the latter minimises the instantaneous inconsistency during users' interactions with shared objects. The performance of the proposed entity state update mechanism is validated through simulation, the results of which are presented and discussed within.

关键词： dead reckoning muliplayer computer games consistency distributed interactive applications

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distributed Xbean applications

Distributed Xbean applications

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2nd international symposium on distributed objects and applications (DOA'00)

作者： Martin, BE jGuru United States

ISBN: (纸本)0769508197

XML has emerged as the universal standard for exchanging and externalizing data. Software products of all kinds are being upgraded to "support XML." Typically this means they can import and export XML data. But just defining standard representations for exchanging data is insufficient. The data need to be integrated with existing applications and databases and processed by programs written in some programming language. This paper describes distributed applications constructed from Xbeans. Xbeans are Java Beans that manipulate XML data. With the appropriate set of Xbeans and a Java Bean design tool, it is possible to build useful distributed applications with little or no programming.

关键词： Application software Computer languages Databases Humans Java Joining processes Packaging Software packages Software reusability XML

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QoS-constrained event communications in distributed virtual environments

QoS-constrained event communications in distributed virtual ...

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2nd international symposium on distributed objects and applications (DOA'00)

作者： Houatra, D France Telecom Res & Dev F-92794 Issy Moulineaux 9 France

ISBN: (纸本)0769508197

distributed interactive simulation applications require thf use of networked virtual environments that represent external systems, and that call perform processing or communications on behalf of objects in the entire environment. We want to develop distributed interactive simulation systems using the object-oriented software approach, and deploy these systems in a large-scale. The systems must satisfy various quality-of-service (qoS) requirements. In this case, the network architecture and the way interactions between remote objects are handled to ensure QoS requirements is of primary interest. This paper presents a scalable network architecture and an interaction model for such systems. The approach is bring evaluated with the project Continuum, which is building a platform for distributed virtual environments with a particular focus on networked games.

关键词： Application software Avatars Computer architecture Concurrent engineering Intelligent networks Object oriented modeling Scalability Telecommunications Virtual environment Visualization

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ODSI: Enterprise service co-ordination 3

ODSI: Enterprise service co-ordination

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3rd international symposium on distributed objects and applications

作者： Bond, A Univ Queensland DTSC Pty Ltd CRC Enterprise Distributed Syst Technol St Lucia Qld 4072 Australia

ISBN: (纸本)076951300X

A challenge for the distributed systems community is to build simple yet flexible environments for composing applications from service components. We need to make the art of software composition available to a broader range of software architects rather than solely technical specialists. Software components are inherently heterogeneous and require infrastructure support for their entire lifecycle of creation, incorporation, alteration, and demise. The ODSI architecture supports the specification and execution of heterogeneous service collaborations based on a shared enterprise model and event-based management infrastructure.

关键词： Software architecture

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Collaboration around shared objects in immersive virtual environments 04

Collaboration around shared objects in immersive virtual env...

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8th IEEE international symposium on distributed Simulation and Real-Time applications (DS-RT 2004)

作者： Wolff, R Roberts, DJ Otto, O Univ Salford Ctr Virtual Environm Salford M5 4WT Lancs England

ISBN: (纸本)0769522327

Many teamwork tasks in the real world require the shared manipulation of objects, both sequentially and concurrently. Collaborative virtual environments (CVE) bring remote people together in an interactive, spatial social and information context that is distributed over a network. Supporting highly collaborative tasks in a natural manner requires a thorough understanding of event traffic as distinct forms of shared object manipulation are bound to diverse real-time and consistency constraints. This position paper summarises our findings during user trials around the shared manipulation of objects within linked immersive displays and introduce a CVE system with a flexible event-handling framework that allows task-oriented consistency control.

关键词： Virtual environment international collaboration

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A fault-tolerant system for Java/CORBA objects

A fault-tolerant system for Java/CORBA objects

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10th Workshop on Advances in Parallel and distributed Computational Models/22nd IEEE international Parallel and distributed Processing symposium

作者： Kumar, Atul Accenture Technol Labs Bangalore 560029 Karnataka India

ISBN: (纸本)9781424416936

Frameworks like CORBA facilitate the development of distributed applications through the use of off-the-shelf components. Though the use of distributed components allows faster building of applications, it also reduces the application availability as failure of any component can make the application unavailable. In this paper we present the design and implementation of a fault-tolerant system for CORBA objects implemented in Java. The proposed fault tolerant system employs object replication. We use a three tier architecture in which the middle tier manages replication and acts as a proxy for replicated objects. The proxy ensures consistency and transparency. In the current implementation, the proxy uses the primary-site approach to ensure strong consistency. Saving and restoring of objects' state is done transparently and it does not require object implementation to have special functions implemented for this purpose.

关键词： Common object request broker architecture (CORBA)

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Component search service and deployment of distributed applications 3

Component search service and deployment of distributed appli...

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3rd international symposium on distributed objects and applications

作者： Kebbal, D Bernard, G Inst Natl Telecommun Dept Informat F-91011 Evry France

ISBN: (纸本)076951300X

This paper presents and discusses some infrastructure services necessary for distributed applications development. The main service considered is the component search service which includes traditional naming and trading-like services. A number of studies have shown recently that current trading, based on interface type conformance, is insufficient for component-based applications. These studies have conclude that semantic information, describing especially the behavior of the component and its context dependencies, is required. This type of trading is called semantic trading. In this paper, we address this problem and propose a component search service model based on semantic trading. Furthermore, we discuss the integration of the service in a deployment tool, through an enhanced deployment process early proposed by Corba Component Model.

关键词： distributed applications software components trading semantic trading component search service application deployment

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