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| | | | | Beschreibung | | The use of components and componentware in software development is en vogue today. Research and industry investigate and work with components and component technologies. Many approaches have been invented for component-based software engineering. Viewed from a distance, components seem to be a well-developed and ready-to-use technique. A closer look, however, shows a quite different scene. Everyone talks about components but in many cases people talk about and address different
issues. Surprisingly after 30 years of research there is still no consensus about the question, what exactly a component is.
The idea behind components can be traced back to a paper, published by M.D. McIlroy at the NATO conference in Garmisch in 1968 about the idea of mass-produced software components. However, since McIlroy’s paper, component notions and definitions developed in various, and in some cases contradictory directions. Today, Szyperski’s definition is cited most frequently:
A software component is a unit of composition with contractually specified interfaces and explicit context dependencies only. A software component can be deployed independently and is subject to composition by third parties.
Szyperski emphasizes the composition and deployment of components. Architecture Description Languages (ADLs) view components as architectural entities. These were two examples of different perspectives in componentware. There is no integration of approaches in componentware. The increasing number of incompatible concepts mirrors terminological inconsistencies.
With these web-pages, we do not intend to clarify these questions. Our goal is rather to provide the reader with an overview of current approaches and work in progress in industry and research in the area of components and componentware. We focus on embedded systems and business information systems. That does not mean that other domains are less important. | |
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