Timed modelling and analysis in web service compositions

International Journal on Semantic Web and Information Systems

This article describes how incorporating temporal constraints in web service composition results in more complex models and makes the verification of temporal consistency during the modeling and execution crucial. This article proposes a model named H-Service-Net based on the time petri net model to control and manage temporal consistency; the model also supports time constraints and exception handling. First, this approach proposes a modular approach for modeling composition using Extend Time Unit System, Allen's interval algebra, and comparison operators in a time petri net model to consider all types of temporal constraints. Subsequently, this article presents algorithms on checking temporal consistency and mechanism for exception handling and validating the system in an implementation tool (H-Service-Editor) based on the proposed approach that uses BizTalk Server 2013 to evaluate the implementation of temporal constraints and timeout exception handling. Finally, an exhaustiv...

Proceedings of the 17th International Conference on Enterprise Information Systems, 2015

Web service composition is studied by many works, and constitutes the heart of a great research activity. However, the majority of this work does not take into account all temporal constraints imposed by the service provider and the users in the composition process. Incorporating temporal constraints in Web service composition result in more complex model and make crucial the verification of temporal consistence during the modeling (at design time) and then during the execution (at run time). In this paper, we presented H-Service-Net model for Web service composition with time constraints, and propose a modular approach for modeling composition with time constraint using Extend time unit system (XTUS), Allen's interval algebra and comparison operators in a time Petri net model.

Web Services, 2009. …, 2009

Current Web service composition approaches and languages such as WS-BPEL do not allow to define temporal constraints in a declarative and separate way. Also it is not possible to verify if there are contradictions between the temporal constraints implemented in the composition. These limitations lead to maintainability and correctness problems. In this paper, we tackle these problems through a novel approach to temporal constraints in Web service compositions, which combines formal methods and aspect-oriented programming. In this approach, we use a powerful and expressive formal language, called XTUS-Automata, for specifying time-related properties and we introduce specification patterns that ease the definition of such constraints. The formal specifications are translated automatically into AO4BPEL aspects, which ensure the runtime monitoring of the temporal constraints. Our approach enables a declarative, separate, and verifiable specification of temporal properties and it generates automatically modular enforcement code for those properties.

Asia-Pacific Web Conference, 2008

Keeping composite services satisfying desired properties has been widely accepted as an important and challenging problem due to the dynamically evolving attribute of web service compositions. Runtime monitoring and dynamic verification techniques become first class activities to be performed during the execution of web service compositions. Scenario-based temporal properties depicting the complex interactions among the different services are a kind of important property which needs to be monitored at runtime. However, some complex scenario-based temporal properties cannot be easily represented by the traditional formalism such as temporal logic. In this paper, we first propose to represent the scenario-based temporal properties of web service compositions by the use of a novel notation (Property Sequence Chart). Then, we use Aspect-Oriented Programming techniques to extend the open-source BPEL engine (ActiveBPEL) and monitor its execution. Based on these assumptions, we propose a more intuitive approach to monitor the scenario-based temporal properties in web service compositions.

ScienceRise, 2015

Issues related to improving the design of multiservice SOA networks are discussed. Issue of creation of complex services, their orchestration and choreography are considered. Problem arising when creating an integrated service is discussed. It is shown that the formal description of the service using temporal logics will perform rigorous verification service and eliminate design errors

2014

It is widely recognized that temporal aspects are indispensable for Web Service modeling. Unfortunately, the current Semantic web Services description languages suffer from the lack of useful concepts needed for timing description. For this purpose, we propose a global methodology for the specification of timing behavior with an extended OWL-S ontology and verification of temporal properties with UPPPAL tool. The applicability is illustrated through the multimodal transport use case.

SIMULATION, 2012

In this paper we introduce a tool called the Web Service Translation tool (WST), which we are developing to implement a methodology for the design, validation and verification of Web Services with timed restrictions. This methodology works by making several translations, from phase to phase in the software development life cycle, where the system is represented at each phase by XML models. We use XSL Transformations (XSLT), which is a language for transforming XML documents. The purpose of these translations is to generate XML code automatically for a Web Service system and to obtain Web Services description models with Timed Automata for validating and verifying composite Web Services with time restrictions.

2011

1 -Time is an important parameter in modeling and analyzing Web services. A Web service can be represented by its behavior which can be described by a business protocol representing the possible sequences of message exchanges. Automated analyses of timed Web services, such as compatibility checking, are very difficult and in some cases are not possible in the presence of implicit transitions (internal transitions) based on time constraints. The source of this difficulty is the semantics of implicit transitions, because most of the wellknown modeling tools do not allow expressing such semantics (e.g., epsilon transition on timed automata has different semantics). This paper presents an approach for removing complex implicit transitions of timed business protocols before performing the interoperability analysis without changing the semantics of the protocols.

2005

The Journal of Logic and Algebraic Programming, 2011

We present an approach for the validation and verification of Web services choreographies, and more specifically, for those composite Web services systems with timing restrictions. We use a W3C proposal for the description of composite Web services, WS-CDL (Web Services Choreography Description Language), and we define an operational semantics for a relevant subset of it. We then define a translation of the considered subset of WS-CDL into a network of timed automata, proving that this translation is correct. Finally, we use the UPPAAL tool for the validation and verification of the described system, by using the generated timed automata.