lSAI SYSTEM THEORY BASED MODELING AND SIMULATION OF SOA-BASED SOFTWARE SYSTEMS

Service oriented architecture (SOA) has drawn increased attention from both academic and industrial communities, and have put forth several standards and solutions. However, we found there is no universally accepted tool or procedure showing the importance of modeling a SOA-based software system based on the important system theory’s characteristics known as (i) flat or hierarchical composition, (ii) feed forward or feedback message flow, and (iii),sequential or parallel processing. In this work, we use system theory and in particular the Discrete event system specification (DEVS) formalism to create SOA domain-specific models for a publish/subscribe SOA service composition. We then modeled an example prototype scale SOA application in the DEVSJAVA simulation environment to study the above characteristics using our DEVS-SOA models. We also conducted simulation experiments and showed the correctness of the DEVS-SOA models against the prototype SOA system from which th