Composing architectural styles from architectural primitives

Architectural styles are named collections of constraints on configurations of architectural elements, and are believed to bring economies of scale in applying software architecture techniques to software development. Existing research on architectural styles provides little guidance for the systematic design and construction of architectural style elements. This paper proposes a framework, Alfa, for systematically and constructively composing "architectural primitives" to obtain elements of architectural styles. This is based on our observation that architectural styles share many underlying concepts that lead to architectural primitives. We have identified eight forms and nine functions as architectural primitives that reflect the syntactic and semantic characteristics of architectural styles and are expressive enough to compose their elements. Our approach is also illustrated using a familiar style -- pipe-and-filter.