Composing Web Services with PEWS: A Trace-Theoretical Approach

Ba, Cheikh Oumar; Ferrari, Mírian Halfeld; Musicante, Martin A.

doi:10.1109/ecows.2006.12

Cited by 6 publications

(15 citation statements)

References 9 publications

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“…In order to obtain minimum factors of t, it is necessary to supplement the algorithm with a procedure of elimination of excessive letters from minimum subwords. This will increase complexity to O m t ( | | ) 3 .…”

Section: Calculation Of the Number Of Minimum Factors Of An Object Thmentioning

confidence: 97%

Inclusion problems in trace monoids

Shahbazyan

Shoukourian

2010

Cybern Syst Anal

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Section: Calculation Of the Number Of Minimum Factors Of An Object Thmentioning

confidence: 97%

Inclusion problems in trace monoids

Shahbazyan

Shoukourian

2010

Cybern Syst Anal

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“…The idea of the π-PEWS meta-model is based on the services' composition approach provided by the language PEWS [14], [15] (Path Expressions for Web Services), a programming language that lets the service designer combine the methods or subprograms that implement each operation of a service, in order to achieve the desired application logic. Figure 5 As shown in the diagram an A-POLICY is applied to a SCOPE that can be either an OPERATION (e.g., an authentication protocol associated to a method exported by a service), an OPERATOR (e.g., a temporal constraint associated to a sequence of operators, the authorized delay between reading a song title in Spotify and updating the walls must be less then 30 seconds), and a PATH (e.g., executing the walls' update under a strict atomicity protocol -all or noting).…”

Section: π-Pews Meta-modelmentioning

confidence: 99%

Reliable Web Services Composition: An MDD Approach

Vargas-Solar¹,

Castro²,

Neto³

et al. 2014

Polibits

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Abstract-This paper presents an approach for modeling and associating Policies to services' based appjalications. It proposes to extend the SOD-M model driven method with (i) the π-SCM, a Policy services' composition meta-model for representing non-functional constraints associated to services' based applications; (ii) the π-PEWS meta-model providing guidelines for expressing the composition and the policies; and, (iii) model to model and model to text transformation rules for semi-automatizing the implementation of reliable services' compositions. As will be shown within our environment implementing these meta models and rules, one may represent both systems' cross-cutting aspects (e.g., exception handling for describing what to do when a service is not available, recovery, persistence aspects) and constraints associated to services, that must be respected for using them (e.g., the fact that a service requires an authentication protocol for executing a method).

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“…PEWS (Path Expressions for Web Services) [3,5] is a new interface description language to define individual and composite web service behavior.…”

Section: Introductionmentioning

confidence: 99%

A programming environment for web services

Musicante

Potrich²,

Carrero

2008

Proceedings of the 2008 ACM Symposium on Applied Computing

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PEWS is a programming language for the definition of web service interfaces. PEWS programs can be used for the description of both simple and composite web services. Simple web services can be built from scratch, by the combination of (WSDL) operations. Each operation must be implemented as a Java method. Composite web services are constructed from the combination of existing web services, accessed by using their WSDL descriptions. PEWS combinators help to define the order in which web services and operations will be performed. PEWS has a human-readable syntax as well as a XML version, called XPEWS. The human-readable language is intended to help in the design of web services and in the formal reasoning about programs. XPEWS is used as an interface language between the front-end and back-end of the PEWS language processor. This paper presents the development of a computational environment for PEWS. The front-end of the environment is an Eclipse plug-in. The use of the front-end can help reducing the time for development of the compositions, by the verification of codification errors and the generation XPEWS documents. The back-end of PEWS is responsible for the implementation of the web services described in a XPEWS document. The back-end produces Java TM code (skeletons) to call the web service operations and performs them in the order defined by the XPEWS document.

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Composing Web Services with PEWS: A Trace-Theoretical Approach

Cited by 6 publications

References 9 publications

Inclusion problems in trace monoids

Inclusion problems in trace monoids

Reliable Web Services Composition: An MDD Approach

A programming environment for web services

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