Engage: Engineering Service Modes with WS-Engineer and Dino

In this demonstration we present an approach to engineering service brokering requirements and capabilities using the concepts of Service Modes. The demonstration illustrates building service modes in UML2 with Rational Software Modeller, transforming modes in WSEngineer and generating artefacts for runtime service brokering. 1 The Service Modes Approach A mode, in the context of service engineering, aims to provide an easily accessible mechanism for developing adaptive service brokering requirements. Service modes are an abstraction of a set of services that collaborate to achieve a task or sub-tasks. A Service Modes Architecture consists of specifying the service components, their configuration and behaviour required or provided, and their interface specifications. We developed and apply a UML Service Modes Profile [1] to identify various elements of the service configuration elements for service brokering, and reuse this in the approach to identify required and provided services in modes. A service modes model consists of a number of mode packages, which themselves contain collaborations with configurations of service components and their requirements or capabilities. If a service component is specified as required, it identifies the service component for service discovery. Alternatively, if a service component is specified as provided, it identifies the service component as offered in service discovery. Additionally, service component bindings may reference binding constraints, offering non-functional requirements or capabilities (such as expected response times for the service specified). We also provide transformations from service mode models to service brokering requirements and capability specifications (initially for a specific service broker Dino from University College London). The transformations generate documents which are deployed on to a runtime broker. Thus, at runtime the requirements documents are used by service clients to create a new brokering session and trigger discovery of required services. Capabilities may also be registered with the service broker, which offers provided services and adds service capability to discoverable services. 1 Sponsored by the EU funded project SENSORIA (IST-2005-016004) Fig. 1. Demonstration of In-Vehicle Service Modes