Improved Adaptation of Web Service Compositions Using Value of Changed Information

Chafle, Girish; Doshi, Prashant; Harney, John; Mittal, Sumit; Srivastava, Biplav

doi:10.1109/icws.2007.104

Cited by 25 publications

(20 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The other solutions [12,9,10,15,8,46] propose adaptations in the definition of a CWS. It is done at two levels: the goal of the first level is to improve availability or performance of a CWS, and at the second level to respond to changes in business requirements.…”

Section: Discussionmentioning

confidence: 99%

“…In order to maintain only the set of optimal workflows there are feedback functions: F R -carries measured QoS values for used services, F P -for aggregated QoS values for a period of time, and F L -for information about service types. This solution is further extended by an additional information Value of Change [10], which analyzes whether the potential gain in QoS parameters is worth measuring. In that way it is possible to avoid reconfiguring workflows.…”

Section: Input Specmentioning

confidence: 99%

See 1 more Smart Citation

Model Aware Execution of Composite Web Services

Zurowska

Deters

2009

2009 IEEE International Conference on Services Computing

View full text Add to dashboard Cite

In the Service Oriented Architecture (SOA) services are computational elements that are published, discovered, consumed and aggregated across platform and organizational borders. The most commonly used technology to achieve SOA are Web Services (WSs). This is due to standardization process (WSDL, SOAP, UDDI standards) and a wide range of available infrastructure and tools. A very interesting aspect of WSs is their composeability. WSs can be easily aggregated into complex workflows, called Composite Web Services (CWSs). These compositions of services enable further reuse and in this way new, even more complex, systems are built.Although there are many languages to specify or implement workflows, in the service-oriented systems BPEL (Business Process Execution Language) is widely accepted. With this language WSs are orchestrated and then executed with specialized engines (like ActiveBPEL). While being very popular, BPEL has certain limitations in monitoring and optimizing executions of CWSs. It is very hard with this language to adapt CWSs to changes in the performance of used WSs, and also to select the optimal way to execute a CWS.To overcome the limitations of BPEL, I present a model-aware approach to execute CWSs. To achieve the model awareness the Coloured Petri Nets (CPN) formalism is considered as the basis of the execution of CWSs. This is different than other works in using formal methods in CWSs, which are restricted to purposes like verification or checking of correctness. Here the formal and unambiguous notation of the CPN is used to model, analyze, execute and monitor CWSs. Furthermore this approach to execute CWSs, which is based on the CPN formalism, is implemented in the model-aware middleware. It is also demonstrated how the middleware improves the performance and reliability of CWSs.ii

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Input Specmentioning

confidence: 99%

Model Aware Execution of Composite Web Services

Zurowska

Deters

2009

2009 IEEE International Conference on Services Computing

View full text Add to dashboard Cite

show abstract

“…Some papers have focused on this specific issue [8,19,24], while others deal with it as a step within the more general problem of QoS based model-driven runtime adaptation of SOA systems [2,1,3,5,7,9,13,14,23,25,26,27]. Some of the works dealing with this general problem propose heuristics (e.g., [3,13] or genetic algorithms in [5]) to determine the adaptation actions.…”

Section: Related Workmentioning

confidence: 99%

“…Other papers have instead considered workflow restructuring, exploiting the inherent redundancy of the SOA environment [9,13,14,25]. [13] provides a methodology to select different redundancy mechanisms to improve the reliability experienced by a single request addressed to a composite service.…”

Section: Related Workmentioning

confidence: 99%

Qos-driven runtime adaptation of service oriented architectures

Cardellini¹,

Casalicchio²,

Grassi³

et al. 2009

Proceedings of the 7th Joint Meeting of the European Software Engineering Conference and the ACM SIGSOFT Symposium on the Found

View full text Add to dashboard Cite

Runtime adaptation is recognized as a viable way for a serviceoriented system to meet QoS requirements in its volatile operating environment. In this paper we propose a methodology to drive the adaptation of such a system, that integrates within a unified framework different adaptation mechanisms, to achieve a greater flexibility in facing different operating environments and the possibly conflicting QoS requirements of several concurrent users. To determine the most suitable adaptation action(s), the methodology is based on the formulation and solution of a linear programming problem, which is derived from a behavioral model of the system updated at runtime by a monitoring activity. Numerical experiments show the effectiveness of our approach. Besides the methodology, we also present a prototype tool that implements it.

show abstract

“…Most of the proposed methodologies for QoS-driven adaptation of SBS address this problem as a service selection problem (e.g., [5], [26], [30], [101]). Other papers have instead considered SBS adaptation through workflow restructuring, exploiting the inherent redundancy of SBS (e.g., [31], [52], [55].) In [28], a unified framework is proposed where service selection is integrated with other kinds of workflow restructuring to achieve greater flexibility in the adaptation.…”

Section: Introductionmentioning

confidence: 99%