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Proceedings of the International Symposium on Distributed Objects and Applications最新文献

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The performance of a real-time I/O subsystem for QoS-enabled ORB middleware 支持qos的ORB中间件的实时I/O子系统的性能
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.793998
F. Kuhns, D. Schmidt, D. Levine
{"title":"The performance of a real-time I/O subsystem for QoS-enabled ORB middleware","authors":"F. Kuhns, D. Schmidt, D. Levine","doi":"10.1109/DOA.1999.793998","DOIUrl":"https://doi.org/10.1109/DOA.1999.793998","url":null,"abstract":"There is increasing demand to extend object request broker (ORB) middleware to support applications with stringent quality of service (QoS) requirements. However conventional ORBs do not define standard features for specifying or enforcing end-to-end QoS for applications with deterministic real-time requirements. This paper describes the design and performance of a real-time I/O (RIO) subsystem optimized for QoS-enabled ORB end-systems that support high-performance and real-time applications running on off-the-shelf hardware and software. The paper illustrates how integrating a real-time ORB with a RIO subsystem can reduce latency bounds on end-to-end communication between high-priority clients without unduly penalizing low-priority and best-effort clients.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115946156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Object Transaction Service: experiences and open issues 对象事务服务:经验和尚未解决的问题
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.794049
P. Ram, L. Do, P. Drew, Tong Zhou
{"title":"Object Transaction Service: experiences and open issues","authors":"P. Ram, L. Do, P. Drew, Tong Zhou","doi":"10.1109/DOA.1999.794049","DOIUrl":"https://doi.org/10.1109/DOA.1999.794049","url":null,"abstract":"Transaction management is required to maintain data consistency in any system with concurrent access to its information. The Object Transaction Service (OTS) is a CORBA service that brings transactional semantics to distributed object oriented applications. We report our experience of developing a prototype using OTS. We present results from our scaling experiments and analyze the overheads incurred by the components of an OTS based distributed transaction. We also highlight issues that need to be addressed if OTS is to be used in large distributed systems such as those in Boeing.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129016756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Adaptive QoS aware binding of persistent multimedia objects 持久多媒体对象的自适应QoS感知绑定
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.794052
T. Plagemann, F. Eliassen, V. Goebel, Tom Kristensen, Hans Ole Rafaelsen
{"title":"Adaptive QoS aware binding of persistent multimedia objects","authors":"T. Plagemann, F. Eliassen, V. Goebel, Tom Kristensen, Hans Ole Rafaelsen","doi":"10.1109/DOA.1999.794052","DOIUrl":"https://doi.org/10.1109/DOA.1999.794052","url":null,"abstract":"The heterogeneity of distributed multimedia systems in terms of hardware, operating systems, programming languages, data formats, compression formats, available resources, and QoS requirements imposes severe problems. The purpose of the middleware platform is to provide interoperability and portability of distributed system services and applications. However, today's middleware platforms, like CORBA and TINA-DPE, do not solve all these problems. For example, automated control of interface compatibility and quality of service (QoS) support are still important research topics. This is especially true in the context of multimedia database systems (MMDBS) in distributed systems, because interface type and QoS depends on the result of queries and cannot be determined in advance. We show how the temporal object oriented data model, TOOMM, and the formal model for bindings MBS can be utilized in a heterogeneous distributed system to: (1) solve compatibility issues, (2) find agreeable levels of QoS, and (3) automatically adapt the flexible multimedia object request broker (ORB) MULTE-ORB, to application requirements and available resources.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128312851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Providing structure for medium-grained distributed object-based computation 为中粒度的基于对象的分布式计算提供结构
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.794045
R. Durrant, G. J. Sweeney, M. Fleury, A. Downton, A. Clark
{"title":"Providing structure for medium-grained distributed object-based computation","authors":"R. Durrant, G. J. Sweeney, M. Fleury, A. Downton, A. Clark","doi":"10.1109/DOA.1999.794045","DOIUrl":"https://doi.org/10.1109/DOA.1999.794045","url":null,"abstract":"Pipelined Processor Farms (PPF) are a generic parallel processing structure suitable for continuous flow, multi algorithm applications. PPF has been redesigned for a multimedia workload which is multifunctional and multimodal. A dynamic object based processing structure is implemented which will map onto mobile stations. The PPF processing model with asynchronous message passing in a multi threaded environment is in effect a version of the actor paradigm which is a dynamic form of encapsulated system. Stable software facilities for distributed object based systems which may include reflection are also needed. The supportive facilities of Java remote method invocation (RMI) are currently being used by PPF. PPF and RMI have been wedded together in a software toolkit, providing a development environment which includes performance prediction, analysis, and guided code generation.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122354580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using mobile agents for parallel processing 使用移动代理进行并行处理
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.793980
L. Silva, Victor Batista, Paulo Martins, Guilherme Soares
{"title":"Using mobile agents for parallel processing","authors":"L. Silva, Victor Batista, Paulo Martins, Guilherme Soares","doi":"10.1109/DOA.1999.793980","DOIUrl":"https://doi.org/10.1109/DOA.1999.793980","url":null,"abstract":"Mobile code is a promising model for distributed computing and it has been exploited in several areas of applications. One of the areas that may benefit from the use of mobile agent technology is parallel processing. This paper describes a Java-based platform, called JAMES, that provides support for parallel computing. We have implemented a software module that supports the well-known model of master/worker and we have exploited the use of parallel computing in some distributed tasks. We present some experimental results that compare the master/worker model with the usual model of migratory agents. Then, we compare the use of mobile agents with two other solutions for parallel computing: MPI and JET. The results are quite promising.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116897801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Pseudo-active replication of distributed objects in wide-area networks 广域网中分布式对象的伪主动复制
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.794004
H. Higaki, Katsuya Tanaka, M. Takizawa
{"title":"Pseudo-active replication of distributed objects in wide-area networks","authors":"H. Higaki, Katsuya Tanaka, M. Takizawa","doi":"10.1109/DOA.1999.794004","DOIUrl":"https://doi.org/10.1109/DOA.1999.794004","url":null,"abstract":"Discusses how to replicate a server in order to obtain fault-tolerant services. In active replication, all the requests from a client are performed by all the server replicas in the same order. The replicas are placed on heterogeneous computers interconnected in a wide area network, e.g. the Internet, where each communication channel has a different message transmission delay and bandwidth. Hence, the response times of the replicas observed by the clients are not the same. We propose a pseudo-active replication, where the client does not wait for other responses after receiving one response, and slower replicas do not perform every request performed by the faster replicas.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116961942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
DOK-Trader: a CORBA persistent trader with query routing facilities 一个具有查询路由功能的CORBA持久交易器
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.794035
G. Craske, Z. Tari, K. Kumar
{"title":"DOK-Trader: a CORBA persistent trader with query routing facilities","authors":"G. Craske, Z. Tari, K. Kumar","doi":"10.1109/DOA.1999.794035","DOIUrl":"https://doi.org/10.1109/DOA.1999.794035","url":null,"abstract":"Existing traders support the required functions, such as the lookup and registry of services. They are limited because they are restricted to a small number of services. The paper proposes solutions to the issues of persistence and query routing in the context of CORBA Trader to improve the performance of the core trader functions. We propose appropriate wrappers that provide database-like interfaces for the traders. This enables transparency and efficient access to persistent services. We propose a design of a full CORBA trader implementation, called DOK-Trader. It has specific functionalities, since it includes a specific routing mechanism for the trader federated queries. We demonstrate that these functionalities have led to better performance for the core CORBA trader functions.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125790211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
ECA rule processing in distributed and heterogeneous environments 分布式和异构环境中的ECA规则处理
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.794056
Sharma Chakravarthy, R. Le, R. Dasari
{"title":"ECA rule processing in distributed and heterogeneous environments","authors":"Sharma Chakravarthy, R. Le, R. Dasari","doi":"10.1109/DOA.1999.794056","DOIUrl":"https://doi.org/10.1109/DOA.1999.794056","url":null,"abstract":"Active systems have been proposed as a paradigm to satisfy the needs of many databases and other applications that require a timely response to situations. Event-Condition-Action (or ECA) rules (S. Chakravarthy et al., 1989) are used to capture the active capability in a system. The utility and functionality of active capability (ECA roles) has been well established in the context of databases. In order for the active capability to be useful for a large class of advanced applications, it is necessary to go beyond what has been proposed/developed in the context of databases. Specifically, extensions beyond the current state of the art in active capability are needed along several dimensions: i) make the active capability available for non-database applications, in addition to database applications; ii) make the active capability available in distributed environments; and iii) make the active capability available for heterogeneous sources of events (whether they are databases are not). The objective of the paper is to provide an architecture and framework to support ECA rules for distributed and heterogeneous systems. We describe the design of our ECA rule service, the alternatives considered at each step and the reasons for our choice of a particular alternative. Finally we draw conclusions about the architecture of our system and the utility of our system for a wide range of applications.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128870476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Distributed objects in a large scale text processing system (industrial case study) 大规模文本处理系统中的分布式对象(工业案例研究)
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.794033
I. Sanz, L. Mazzucchelli
{"title":"Distributed objects in a large scale text processing system (industrial case study)","authors":"I. Sanz, L. Mazzucchelli","doi":"10.1109/DOA.1999.794033","DOIUrl":"https://doi.org/10.1109/DOA.1999.794033","url":null,"abstract":"We describe the distributed object oriented architecture of TREVI, a system designed to help overcome the information overload problem. TREVI provides a comprehensive framework for the processing and dissemination of documents coming from news streams and other external sources. TREVI is designed to perform a variety of linguistic and text processing tasks, according to the informational needs expressed in user profiles. Many different user profiles may be simultaneously present, and the sheer volume of information that has to be managed by the system poses serious scalability and performance concerns. We show how the use of a distributed, component based architecture allows us to cope with these challenges, and furthermore provides an excellent base for future system extension, allowing for a rapid response to changing user informational needs.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"02 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133621941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
The data network: a distributed object view of dynamic data management 数据网络:动态数据管理的分布式对象视图
Proceedings of the International Symposium on Distributed Objects and Applications Pub Date : 1999-09-05 DOI: 10.1109/DOA.1999.793985
M. Machura
{"title":"The data network: a distributed object view of dynamic data management","authors":"M. Machura","doi":"10.1109/DOA.1999.793985","DOIUrl":"https://doi.org/10.1109/DOA.1999.793985","url":null,"abstract":"The paper builds on the premise that the emerging distributed object infrastructure will logically evolve into a flexible, dynamic data management environment based on a combination of distributed objects, data services and data self-organisation. In order to fulfil this goal, the distributed object community should draw upon the experience accumulated over the years by database researchers and offer its own long-term vision of distributed data processing. The proposed approach is called dispersed data management to emphasise the fact that the conventional, large information sources are divided into smaller, more manageable data entities that are dynamically distributed across computer networks. If that happens it may well be possible to replace the traditional database systems by general, powerful data management architectures based on common data services.","PeriodicalId":360176,"journal":{"name":"Proceedings of the International Symposium on Distributed Objects and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122235051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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