A common basis for modelling service-oriented and event-driven architecture

Component based approaches to Enterprise Architecture (EA) include Service Oriented Architecture (SOA) and Event Driven Architecture (EDA). Model-based approaches to EA support SOA in terms of components and services expressed as interfaces and messages. However, there are few modelbased approaches that support EDA even though SOA and EDA are both based on components. UML has components, however there is no support for events and no support for component patterns (or templates). This paper describes a simple extension to UML that supports both SOA and EDA. Components have both operation and event interfaces. The modelling language is implemented using a higher-order simulation language where templates are defined as functions over component definitions. The languages are described using a case study that has been implemented in Java.