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61.
Dynamic SLAs management in service oriented environments 总被引:1,自引:0,他引:1
Giuseppe Di Modica Author Vitae Author Vitae Lorenzo Vita Author Vitae 《Journal of Systems and Software》2009,82(5):759-771
The increasing adoption of service oriented architectures across different administrative domains, forces service providers to use effective mechanisms and strategies of resource management in order for them to be able to guarantee the quality levels their customers demands during service provisioning. Service level agreements (SLA) are the most common mechanism used to establish agreements on the quality of a service (QoS) between a service provider and a service consumer. The WS-Agreement specification, developed by the Open Grid Forum, is a Web Service protocol to establish agreements on the QoS level to be guaranteed in the provision of a service. The committed agreement cannot be modified during service provision and is effective until all activities pertaining to it are finished or until one of the signing party decides to terminate it. In B2B scenarios where several service providers are involved in the composition of a service, and each of them plays both the parts of provider and customer, several one-to-one SLAs need to be signed. In such a rigid context the global QoS of the final service can be strongly affected by any violation on each single SLA. In order to prevent such violations, SLAs need to adapt to any possible needs that might come up during service provision. In this work we focus on the WS-Agreement specification and propose to enhance the flexibility of its approach. We integrate new functionality to the protocol that enable the parties of a WS-Agreement to re-negotiate and modify its terms during the service provision, and show how a typical scenario of service composition can benefit from our proposal. 相似文献
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Matjaz B. Juric Author Vitae Ana Sasa Author Vitae Author Vitae Ivan Rozman Author Vitae 《Journal of Systems and Software》2009,82(8):1326-1343
Versioning is an important aspect of web service development, which has not been adequately addressed so far. In this article, we propose extensions to WSDL and UDDI to support versioning of web service interfaces at development-time and run-time. We address service-level and operation-level versioning, service endpoint mapping, and version sequencing. We also propose annotation extensions for developing versioned web services in Java. We have tested the proposed solution for versioning in two real-world environments and identified considerable improvements in service development and maintenance efficiency, improved service reuse, and simplified governance. 相似文献
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异步操控性是脑机接口走向实际应用的关键技术之一.其关键点在于寻找一种可有效区分脑机接口工作状态和空闲状态的指标.建立了针对P300脑机接口的刺激起始异步(SOA)扰动模型,在仿真实验和实测数据中观察到SOA扰动谱线,并根据所提出的模型给出了合理解释.研究了SOA扰动的频域特性,结果表明,当SOA位于220 ms附近时,SOA扰动的强度最大,而当SOA低于150 ms时,SOA扰动强度将急剧减小.同时SOA扰动所具有的锁相性使得可以通过时域相干平均法进一步提高信噪比.SOA扰动可作为脑机接口处于工作状态的标志,为异步脑机接口的实现提供了一种新的研究思路. 相似文献
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随着通信技术、网络技术的快速发展,车辆导航技术正逐步向动态网络导航演进.本文通过分析目前动态导航交通信息服务平台存几个主要薄弱的技术问题,提出层次化的动态导航交通信息服务平台总体框架.该框架由数据供应层、动态导航信息服务层、通信层和用户层组成.本文研究平台的总体框架、软件体系结构、数据库的建立和发布协议等主要关键技术.建立实现了B/S与C/S混合模式的交通信息服务技术平台. 相似文献
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为适应气象水文保障数据频繁交互的需要,基于部队内部传输网络,采用WebService和企业服务总线技术,构建一个面向服务架构的数据共享与交换平台.通过该平台实现跨军区军兵种多级应用间的数据交换和信息共享。 相似文献