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Open Access Publications from the University of California

Extending component interoperability standards to support architecture-based development


Components have increasingly become the unit of development of software. In industry, there has been considerable work in the development of standard component interoperability models, such as ActiveX, CORBA and JavaBeans. In academia, there has been intensive research in developing a notion of software architecture. Both of these efforts use software components as the basic building blocks, and both address concerns of structure and reuse. With component interoperability models, the focus is on specifying interfaces, binding mechanisms, packaging, inter-component communication protocols, and expectations regarding the runtime environment. With software architecture, the focus is on specifying systems of communicating components, analyzing system properties, and generating "glue" code that binds system components. Our research involves studying how standard component models can be extended to accommodate important issues of architecture, including a notion of architectural style and support for explicit connectors. For our initial effort in this work, we have enhanced the JavaBeans component model to support component composition according to the C2 architectural style. Our approach enables the design and development of applications in the C2 style using off-the-shelf Java components or "beans" that are available to the designer. In this paper, we describe the techniques underlying our approach, and we identify the important issues that surface when attempting this type of extension.

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