Combining Dynamic Workflow and Transactional Semantics Using a Pattern-Based Approach

The main issues for the fulfillment service level agreements (SLA) are concerned with problem of variability of QoS properties (vQoS). Indeed, the QoS properties may evolve frequently either because of internal changes or because of workload fluctuations.To solve the vQoS problem, we first introduced three variability operators: replicate, delete and replace. These operators will be used to reconfigure CWS when the SLA contract is violated. The first two operators are used to add and remove Web service instances, while the last one is used to substitute some faulty Web services. Then, we proposed an incremental approach for modeling and verifying the composites services (CWSs) reconfiguration using Event-B. We start by abstractly specifying the main requirements and then we refine them through several steps to model CWSs. The consistency of each model and the relationship between an abstract model and its refinements are obtained by formal proofs. Finally, we used ProB model-checker to trace possible design errors. We have exploited the LTL for dynamic reconfigurations to characterize the correct behavior of CWSs reconfiguration.

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“…In addition, we will show how the dynamic variability operators can be implemented using dynamic transactional patterns [20]. …”

Section: Discussionmentioning

confidence: 99%

A Formal Approach for Verifying QoS Variability in Web Services Composition Using EVENT-B

Abbassi¹,

Graiet

Boubaker

et al. 2015

2015 IEEE International Conference on Web Services

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“…In this section, we show how to model reconfigurable CWSs using DTPs. For this aim, we will refine the model that is developed in the previous section by introducing the concept of DTPs [2], [3].…”

Section: B Reconfigurable Composite Servicesmentioning

confidence: 99%

“…Due to the lack of space, we put emphasis on the following three DTPs (that we fully detailed in [2]): DAD (Dynamic AnD) split, DAD (Dynamic AnD) join and DSQ MACHINE patternMachine REFINES compositionMachine SEES serviceContext VARIABLES CS states DADsplit DADjoin DSQ ptDADsplit ptDADjoin ptDSQ INVARIANTS inv1: DADsplit ∈ CS → P(CS) inv2: DADjoin ∈ P(CS) → CS inv3: DSQ ∈ CS → CS inv4: ptDADsplit ∈ P(CS)×{0,1,2} → P(CS×CS) inv5: ptDADjoin ∈ P(CS)×{0,1,2} → P(CS×CS) inv6: ptDSQ ∈ P (CS)×{0,1,2} → P(CS×CS) . .…”

Section: B Overview Of Dtpsmentioning

confidence: 99%

“…It is therefore necessary that CWSs should be able to automatically reconfigure themselves by flexibly reacting to the faults in a timely fashion. The concept of dynamic transactional pattern (DTP) [2], [3] has been introduced in order to model reconfigurable CWSs. A CWS is said to be reconfigurable if it is able to repair itself automatically if any execution problems occur, in order to successfully complete its own execution.…”

Section: Introductionmentioning

confidence: 99%

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A Formal Approach for Ensuring a Correct Reconfigurable Composite Service

Graiet¹,

Abbassi²,

Maroui³

et al. 2015

2015 IEEE International Conference on Services Computing

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The reconfigurable composite services (CWSs) can repair itself if any execution problems occur, in order to complete successfully its own execution. The research problem in which we are interested in is how to ensure the correctness of reconfigurable CWSs.This paper proposes an incremental design approach for modeling and verifying reconfigurable CWSs by using Event-B. We start by abstractly specifying the main requirements of reconfigurable CWSs and then refining them through several steps by introducing the concept of dependencies and dynamic transactional patterns (DTPs) to model reconfigurable CWSs. The consistency of each model and the relationship between an abstract model and its refinements are obtained by formal proofs. Finally, we use ProB model-checker to trace possible design errors.

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Combining Dynamic Workflow and Transactional Semantics Using a Pattern-Based Approach

Cited by 2 publications

References 10 publications

A Formal Approach for Verifying QoS Variability in Web Services Composition Using EVENT-B

A Formal Approach for Verifying QoS Variability in Web Services Composition Using EVENT-B

A Formal Approach for Ensuring a Correct Reconfigurable Composite Service

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