NDLI: Service Composition for Real-Time Assurance

Content Provider	IEEE Xplore Digital Library
Author	Tong Gao Moussa, H. I-Ling Yen Bastani, F. Jun-Jang Jeng
Copyright Year	2008
Description	Author affiliation: Univ. of Texas, Dallas, TX (Tong Gao; Moussa, H.; I-Ling Yen; Bastani, F.)
Abstract	Service oriented architecture (SOA) has become a popular paradigm for software development in many application domains, including real-time applications. Timing analysis is a critical issue which can guide service composition to best satisfy the real time requirements of the composed system. However, existing timing analysis works do not sufficiently address some important issues. For example, admission control is an important technique for real time assurance, but most of the timing analysis techniques do not take admission control into account and, hence, may result in unrealizable decisions. Also, communication time is an important factor in real-time assurance, but most of the works do not provide clear approaches in dealing with communication time analysis. In this paper, we propose a timing specification model and analysis techniques for real-time service-oriented systems. In the specification model, a thorough consideration of all information required for timing analysis is discussed. For timing analysis, we consider the service time softly guaranteed by the admission control policy as well as estimated communication cost to reach more accurate timing estimates. Also, to avoid the analysis overhead in large-scale SOA systems, we propose a three-phase approach. In this approach, we first use a highly efficient but moderately accurate algorithm to eliminate most of the candidate compositions. More accurate timing prediction is performed on a small number of selected compositions in the second phase. In the third phase, specific concrete services are selected and admissions are performed to finalize the composition and service grounding. The approach is scalable and can effectively achieve service composition for real time requirement satisfaction.
Starting Page	1174
Ending Page	1179
File Size	406661
Page Count	6
File Format	PDF
ISBN	9780769532622
ISSN	07303157
DOI	10.1109/COMPSAC.2008.183
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-28
Publisher Place	Finland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Timing Web services Real time systems Admission control Quality of service Time factors Algorithm design and analysis Specification and analysis Service Composition Real-Time assurance
Content Type	Text
Resource Type	Article
Subject	Computer Science Applications Software

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