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Formal Approaches to Service-oriented Design: From Behavioral Modeling to Service Analysis
Publication Type:
Licentiate Thesis
Publisher:
Mälardalen University
Abstract
Service-oriented systems (SOS) have recently emerged as context-independent
component-based systems. In contrast to components, services
can be created, invoked, composed and destroyed on-the-fly. Services
are assumed to be platform independent and available for use within
heterogeneous applications. One of the main assets in SOS is service
composability. It allows the development of composite services with the
main goal of reusable functionality provided by existing services in a low
cost and rapid development process on-the-fly. However, in such distributed
systems it becomes difficult to guarantee the quality-of-services
(QoS), both in isolation, as well as of the newly created service compositions.
Means of checking correctness of service composition can enable
optimization w.r.t. the function and resource-usage of composed
services, as well as provide a higher degree of QoS assurance of a service
composition. To accomplish such goals, we employ model-checking technique
for both single and composed services. The verification eventually
provides necessary information about QoS, already at early development
stage. This thesis presents the research that we have been carrying out,
on developing of methods and tools for the specification, modeling, and
formal analysis of services and service compositions in SOS. In this work,
we first show how to formally check QoS in terms of performance and
reliability for formally specified component-based systems (CBS). Next,
we outline the commonalities and differences between SOS and CBS.
Third, we develop constructs for the formal description of services using
the resource-aware timed behavioral language called Remes, including
development of language to support service compositions. At last, we
show how to check service and service composition (functional, timing
and resource-wise) correctness by employing the strongest postcondition
semantics. For less complex services and service compositions we choose to prove correctness using Hoare triples and the guarded command language.
In case of complex services described as priced timed automata
(PTA), we prove correctness via algorithmic computation of strongest
postcondition of PTA.
Bibtex
@misc{Causevic2162,
author = {Aida Causevic},
title = {Formal Approaches to Service-oriented Design: From Behavioral Modeling to Service Analysis},
number = {134},
month = {June},
year = {2011},
publisher = {M{\"a}lardalen University},
url = {http://www.es.mdu.se/publications/2162-}
}