4,308 research outputs found
How validation can help in testing business processes orchestrating web services
Validation and testing are important in developing correct and fault free SOA-basedsystems. BPEL is a high level language that makes it possible to implement business processes asan orchestration of web services. In general, the testing requires much more test scenarios than thevalidation. However, in the case of BPEL processes, which have very simple and well structuredimplementation, test scenarios limited to the validation may also be efficient. The paper describes anexperiment that aims at answering a question whether or not the validation test scenarios are alsoadequate for testing an implementation of BPEL processes. The experiment employs a Software FaultInjector for BPEL Processes that is able to inject faults when the test scenarios are running. Theresults of the experiment seem very promising. Hence, it seems that validation tests might give astrong support for testing
Orchestrating Economic, Socio-Technical and Technical Validation Using Visual Modelling
The paper presents an approach for orchestrating validation of project results from different
perspectives by using visual modelling techniques. The context for the paper is the FP6 project
MAPPER. Validation in MAPPER covers economic, socio-technical and technical viewpoints. The
economic viewpoint mainly focuses on business value and coherence with business drivers like
reduced lifecycle time or increased flexibility. Sustainable collaboration for joint value creation of
various units in a networked organisation is the main aspect of the socio-technical viewpoint. From a
technical point of view, usability of IT-infrastructure and services is a key aspect. The MAPPER
Validation Framework includes and orchestrates approaches and methodologies from these three
viewpoints and defines the validation actions to be performed. The main contributions of the paper to
research in the field are (1) the structure of the MAPPER Validation Framework integrating different
validation perspectives, (2) experiences from using a visual modelling environment for framework
development and (3) experiences from orchestrating different validation perspectives
Component-aware Orchestration of Cloud-based Enterprise Applications, from TOSCA to Docker and Kubernetes
Enterprise IT is currently facing the challenge of coordinating the
management of complex, multi-component applications across heterogeneous cloud
platforms. Containers and container orchestrators provide a valuable solution
to deploy multi-component applications over cloud platforms, by coupling the
lifecycle of each application component to that of its hosting container. We
hereby propose a solution for going beyond such a coupling, based on the OASIS
standard TOSCA and on Docker. We indeed propose a novel approach for deploying
multi-component applications on top of existing container orchestrators, which
allows to manage each component independently from the container used to run
it. We also present prototype tools implementing our approach, and we show how
we effectively exploited them to carry out a concrete case study
A Rigorous Methodology for Composing Services
Creating new services through composition of existing ones is an attractive option. However, composition can be complex and service compatibility needs to be checked. A rigorous and industrially-usable methodology is therefore desirable required for creating, verifying, implementing and validating composed services. An explanation is given of the approach taken by CRESS (Communication Representation Employing Systematic Specification). Formal verification and validation are performed through automated translation to LOTOS (Language Of Temporal Ordering Specification). Implementation and validation are performed through automated translation to BPEL (Business Process Execution Logic) and WSDL (Web Services Description Language). The approach is illustrated with an application to grid service composition in e-Social Science
Automated Analysis and Implementation of Composed Grid Services
Service composition allows web services to be combined into new ones. Web service composition is increasingly common in mission-critical applications. It has therefore become important to verify the correctness of web service composition using formal methods. The composition of grid services is a similar but new goal. We have previously developed an abstract graphical notation called CRESS for describing composite grid services. We have demonstrated that it is feasible to automatically generate service implementations as well as formal specifications from CRESS descriptions. The automated service implementations use orchestration code in BPEL, along with the service interfaces and data types in WSDL and XSD respectively for all services. CRESS-generated BPEL implementations currently do not useWSRF features such as implicit endpoint references for WS-Resources and interfacing to standard WSRF port types. CRESS-generated formal models use the standardised process algebra LOTOS. Service behaviour is modelled by processes, while service data types are modelled as abstract data types. Simulation and validation of the generated LOTOS specifications can be performed. In this paper, we illustrate how CRESS can be further extended to improve its generation of service compositions, specifically for WSRF services implemented using Globus Toolkit 4. We also show how to facilitate use of the generated LOTOS specifications with the CADP toolbox
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A Semantic-based framework for discovering business process patterns
Patterns currently play an important role in modern information systems (IS) development and their use has mainly been restricted to the design and implementation phases of the development lifecycle. Given the increasing significance of business modeling in IS development, patterns have the potential of providing a viable solution for promoting reusability of recurrent generalized models in the very early stages of development. This paper focuses on business process patterns and proposes an initial framework for the discovery and reuse of business process patterns within the IS development lifecycle. The framework synthesizes the idea from the domain engineering literature and proposes the use of semantics to drive both the discovery of patterns as well as their reuse
Higher-Order Process Modeling: Product-Lining, Variability Modeling and Beyond
We present a graphical and dynamic framework for binding and execution of
business) process models. It is tailored to integrate 1) ad hoc processes
modeled graphically, 2) third party services discovered in the (Inter)net, and
3) (dynamically) synthesized process chains that solve situation-specific
tasks, with the synthesis taking place not only at design time, but also at
runtime. Key to our approach is the introduction of type-safe stacked
second-order execution contexts that allow for higher-order process modeling.
Tamed by our underlying strict service-oriented notion of abstraction, this
approach is tailored also to be used by application experts with little
technical knowledge: users can select, modify, construct and then pass
(component) processes during process execution as if they were data. We
illustrate the impact and essence of our framework along a concrete, realistic
(business) process modeling scenario: the development of Springer's
browser-based Online Conference Service (OCS). The most advanced feature of our
new framework allows one to combine online synthesis with the integration of
the synthesized process into the running application. This ability leads to a
particularly flexible way of implementing self-adaption, and to a particularly
concise and powerful way of achieving variability not only at design time, but
also at runtime.Comment: In Proceedings Festschrift for Dave Schmidt, arXiv:1309.455
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