Non Functional Properties and Service Level Agreements in Service Oriented Computing Workshop (NFPSLA-SOC'07)

Venue: Vienna

Location: Vienna, Austria

Event Date/Time: Sep 17, 2007 End Date/Time: Sep 17, 2007
Abstract Submission Date: Jul 02, 2007
Paper Submission Date: Jul 16, 2007
Report as Spam


Service-Oriented Architecture (SOA) is becoming a key aspect for system agility and quickly developing new businesses. As core concepts of any SOA-based system, services have recently received significant interest. They can be used to support Business-to-Business (B2B), Enterprise Application Integration (EAI), and collaborations within or between Virtual Organizations. Like other software components services expose both functional properties (i.e. what they do) and non-functional properties (i.e. the way they are supplied). Non-functional properties (NFPs) of a system are many and varied, including all properties which are not directly related to the functionality provided. NFPs include quality of service (QoS) as well as other properties such as cost, adherence to standards and obligations on the consumer/provider. QoS is one of the most important subsets of non-functional properties. Although the term QoS is traditionally used to refer specifically to network performance and reliability characteristics (and methods of guaranteeing these properties) in the context of SOA the term must refer to a wider variety of service properties. This is because there are numerous properties which can be used as indicators of quality (including, e.g. performance, dependability, security, accuracy, customer service, etc.). The term, as applied in SOA, must also refer to properties of system components at different levels of granularity (e.g. network, server, service, operation).

Non-functional properties play an important role in all service related tasks, especially in discovery, selection and substitution of services. It is simple to imagine a scenario in which multiple services which provide the same functionality can fulfill a user request. In this case the ability of the user to differentiate between the services depends upon their non-functional properties. Modeling, managing and performing service related tasks such as discovery, composition, negotiation and agreement based on NFPs become fundamental challenges in Service-Oriented Architectures especially in real business settings. Directly connected to the tasks mentioned above are the specification, enforcement and management of Service Level Agreements (SLAs). SLAs give the service consumer some level of guarantee that the provider and the service/s that they provide will operate within acceptable bounds - particularly with regards to non-functional properties and QoS values. At the same time SLAs serve a role for the provider in planning resource allocation and avoiding unexpected legal wrangles. With the ever-growing demand for eBusiness, service providers are increasingly interested in enforcing contracts electronically allowing autonomous supervision of service status and management. Machine-understandable NFPs and QoS models are therefore key to the widespread uptake of SLAs as well as all of the service related tasks mentioned above.

This workshop aims to tackle the research problems around methods, concepts, models, languages and technology that enable management of non-functional properties and Service Level Agreements in the context of Service Oriented Computing. This workshop aims to bring together researchers and industry attendees addressing these issues, to promote and foster a greater understanding of how the management of NFP, QoS and SLAs can assist business to business and enterprise application integration.