A quality-based semantic service broker using reachability indexes

Cloud computing based on the loosely coupled service-oriented architecture facilitates the process of application integration from existing software. As there is a growing demand for cloud computing techniques and applications across a wide range of domains; selecting the best from many services which provide similar functionality remains an elusive task. In this paper, we propose a quality-based semantic service broker using reachability indexes. This broker uses semantic concepts to model services in a conceptual aggregation graph. In addition, the broker also creates reachability labels for each vertex in the conceptual aggregation graph to speed up composition discovery. During the service discovery and composition, all possible solutions are found and ranked by the service consumer´s quality requirements. Even if no solution matches the quality requirements, a suggested solution from the similarity distance relaxation is provided.