NDLI: The COMQUAD component model: enabling dynamic selection of implementations by weaving non-functional aspects

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The COMQUAD component model: enabling dynamic selection of implementations by weaving non-functional aspects

Content Provider	ACM Digital Library
Author	Göbel, Steffen Pohl, Christoph Zschaler, Steffen Röttger, Simone
Abstract	The reliability of non-functional contracts is crucial for many software applications. This added to the increasing attention this issue lately received in software engineering. Another development in software engineering is toward component-based systems. The interaction of both, non-functional aspects and components, is a relatively new research area, which the COMQUAD project is focusing on.Our component model, presented in this paper, enables the specification and runtime support of non-functional aspects in component-based systems. At the same time, a clear separation of non-functional properties and functionally motivated issues is provided. We achieve this by extending the concepts of the existing component-based systems Enterprise JavaBeans (EJB) and CORBA Components (CCM). Non-functional aspects are described orthogonally to the application structure using descriptors, and are woven into the running application by the component container acting as a contract manager. The container implicitly instantiates component specifications and connects them according to the current requests. The selection of actual implementations depends on the particular client's non-functional requirements. This technique also enables adaptation based on the specific quantitative capabilities of the running system.In this paper we give a detailed description of the COMQUAD component model and the appropriate container support. We also provide a simple case study of a multimedia application for better understanding.
Starting Page	74
Ending Page	82
Page Count	9
File Format	PDF
ISBN	1581138423
DOI	10.1145/976270.976281
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-03-22
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Aosd Components Adaptivity Qos Non-functional properties
Content Type	Text
Resource Type	Article

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