Two-Level Grammar as the Formalism for Middleware Generation in Internet Component Broker Organizations

During the software production of any business domain, we will encounter components coming from different component models. Realizing the interoperability among heterogeneous component models at technology domain level is one of the fundamental difficulties of achieving product line constructions at business domain level. Our research of automatic glue and wrapper code generation to compose the components adhering to different component models follows the idea of Generative Programming (GP) [Cza00]. The Generative Domain Model (GDM) for glue/wrapper code production consists of two levels: 1) metaspecifications for heterogeneous components from the component level, 2) on the system level, there are component model domain-specific Knowledge Bases (ds-KBs) together with their associated middleware code generators. Two-Level Grammar is the formalism for both the component and system level specifications, thus is the key technology to automate middleware code generation.