Enhancing message-oriented middleware capability and flexibility for dynamic service composition in context-aware distributed systems

Subject of this paper is the advancement of the middleware capabilities and configuration flexibility in complex context-aware distributed systems, according to the Service-Oriented Architecture (SOA) paradigm. Results are presented on an ongoing work concerned with the architecting, design and development of a message-oriented middleware for atomic and composite service brokering, named SAI middleware. The SAI middleware aims at flexibly offering a set of features for service brokering and dynamic composition across different application scenarios, while also guaranteeing loose coupling between service providers and consumers and relaxing the prerequisites for service providers to publish their capabilities in an interoperability domain. Our basic contribution consists in addressing these issues in a holistic way, as required to effectively support the SOA vision in context-aware application scenarios, while not optimizing single aspects yet, but demonstrating capability of easily matching requirements in different application scenarios.