Policy Support for Business-oriented Web Service Management

Lecture Notes in Computer Science

Semini

2011

Self Cite

Abstract. Businesses typically structure their activities with workflows, which are often implemented in a rather static fashion in their IT systems. Nowadays, system requirements change rapidly as businesses try to maintain their competitive edge, calling for similar agility of the IT systems. To this end, we present StPowla, an approach that marries service oriented architecture, policies and workflows to support the agile execution of business workflows. In StPowla, the business is modelled by workflows, whose tasks are eventually carried out by services. Adapatation is obtained by allowing the stakeholders to define policies that establish the quality levels required of the services. The prototype StPowla support architecture comprizes the transformation of the workflow model into executable WS-BPEL to be deployed in the ODE-BPEL execution engine, the generation of default policies from the model, and the enactment of the policies by the Appel policy server. The SENSORIA Finance Case Study is used throughout the paper.

Section: Related Workmentioning

confidence: 58%

Model-Driven Development of Adaptable Service-Oriented Business Processes

Montangero

Lecture Notes in Computer Science

Semini

2011

Self Cite

“…Possibly AgentWork [MGR04], where ECA rules can be used to drop or add individual tasks to workflows, is closest to our initial discussions on linking policies with workflows [GRM06b,GRM06a]. However, there is no notion of tasks being linked to services in this work, and the policies are concerned with task replacement rather than task implementation, service selection or the more significant workflow restructuring discussed here.…”

Section: Related Workmentioning

confidence: 99%

From StPowla processes to SRML models

Bocchi

Gorton²,

2010

Form. Asp. Comput.

Self Cite

Abstract. Service Oriented Computing is a paradigm for developing software systems as the composition of a number of services. Services are loosely coupled entities, that can be dynamically published, discovered and invoked over a network. The engineering of such systems presents novel challenges, mostly due to the dynamicity and distributed nature of service-based applications. In this paper, we focus on the modelling of service orchestrations. We discuss the relationship between two languages developed under the SENSORIA project: SRML as a high level modelling language for Service Oriented Architectures, and STPOWLA as a process-oriented orchestration approach that separates core business processes from system variability at the end-user's level, where the focus is towards achieving business goals. A fundamental challenge of software engineering is to correctly align business goals with IT strategy, and as such we present an encoding of STPOWLA to SRML. This provides a formal framework for STPOWLA and also a separated view of policies representing system variability that is not present in SRML.

“…Possibly AgentWork [15] system, where ECA rules can be used to drop or add individual tasks to workflows, is closest to our initial discussions on linking policies with workflows [9,8]. However, there is no notion of tasks being linked to services in this work, and the policies are concerned with task replacement rather than task implementation or service selection.…”

Section: Related Workmentioning

confidence: 99%

StPowla: SOA, Policies and Workflows

Gorton

Montangero

Service-Oriented Computing – ICSOC 2007

et al. 2009

Abstract. We introduce StPowla, a workflow based approach to business process modelling that integrates a simple graphical notation, to ease the presentation of the core business process, a natural policy language, Appel, to provide the necessary adaptation to the varied expectations of the various business stakeholders, and the Service Oriented Architecture, to assemble and orchestrate available services in the business process. We illustrate the approach with a loan approval process.