Luis Iribarne, University of Almeria (Spain)
José M. Troya, University of Málaga (Spain)
Antonio Vallecillo, University of Málaga (Spain)

Abstract:

Component-based software development (CBSD) is gaining recognition as the key technology for the construction of high-quality, evolvable, large complex systems in timely and affordable manners. In CBSD, the development effort becomes one of gradual discovery about the components, their capabilities, their internal assumptions, and the incompatibilities that arise when they are used in concert. Thus, trading becomes a cornerstone of this process. However, most of the existing methods for component-based software development do not make effective use of traders. In this paper we analyze the required features that COTS components traders should have, and introduce COTStrader, an Internet-based trader for COTS compo-nents. In addition, we discuss how the COTStrader can be integrated into a spiral methodology for CBSD, providing automated support for building COTS-based systems.

Related material

The COTStrader Framework Environment API.

The COTS samples repository.

A case study on building a GTS system using COTS components.

Technology remarks.

Refered COTStrader papers.

The automated Trading Service Process.

A COTS document example using COTSComponent template.

COTStrader testbed site.

COTStrader resources (COTStraderBrowser, COTS-XMLSchema, COTSconfigs ...).

• All processes have been implemented using Java technology.
• To describe the software architecture we have used Rational Rose RealTime, that adopts the Bran Selic's UML-RT version.
• To write COTS documents and to look for COTS we have used COTSComponent and COTSquery templates, based on W3C XML 1.0 notation.
• To write the query expressions in a COTSquery template we have used the notation defined in the W3C's XML Query Algebra and XQEngine.
• To develop the template schema we used W3C XMLSchema.
• To develop COTStrader we used IONA ORB Orbacus.
• To develop the repository of component templates and to describe these templates, we used IBM AlphaWorks XML4J.
• Also we implemented a web client to support trading service from http://www.cotstrader.com.
• To build the website and the trading service by Internet, we implemented several Servlets for Apache Tomcat WebServer, under Linux platform.
• Finally, for certain parts of the proposed methodology we also made punctual use of well-known formalizations. For example:
• OCL to describe component properties of COTScomponent templates.
• Leaven's JML to describe semantic specifications of the interfaces of a COTS component.
• pi-calculus notation for protocol descriptions.

1. L. Iribarne, J.M. Troya, and A. Vallecillo. "A case study on building a GTS system using COTS components". Technical Report TR-2002-09-01, Department of Lenguajes y Computación, University of Almeria, Spain. September 2002.
2. L. Iribarne, J.M. Troya, and A. Vallecillo. "Selecting software components with multiple interfaces". Proceeding of the 28th EUROMICRO Conference --Component-Based Software Engineering. pp 26-32, IEEE Computer Society. Dortmund, Germany. September 2002.
3. L. Iribarne, J.M. Troya, and A. Vallecillo. "Trading for COTS components in Open Environments". Proceeding of the 27th EUROMICRO Conference--Component-Based Software Engineering. pp 22-29, IEEE Computer Society. Warsaw, Poland. September 2001.
4. L. Iribarne, A. Vallecillo, C. Alves and J. Castro. "A Non-Functional Approach for COTS Components Trading". To appear in the IV Workshop on Requirements Engineering. Buenos Aires, Argentina -November 22-23, 2001.

Contact address

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