QoS Aspect Languages and Their Runtime Integration

Abstract. Distributedobject middleware, suchas CORBA, hides systemand network-speci c characteristics of objects behind functional interface speci cations. This simpli es development and maintenance of distributed objects, contributing to their growing acceptance. Critical applications have Quality of Service (QoS) requirements, however, such as real-time performance, dependability,or security, that are hidden bymiddleware. Because of this, application developers often bypass distributed object systems, thus gaining little or no advantage from the middleware. We have developed Quality Objects (QuO), a framework for developing distributed applications with QoS requirements. QuO provides a set of aspect languages, called Quality Description Languages (QDL), for specifying possible QoS states, the system resources and mechanisms for measuring and controlling QoS, and behavior for adapting to changing levels of available QoS at runtime. This paper describes QuO's aspect languages, the...

• Type: Conference
• Year: 1998
• Where: LCR
• Authors: Joseph P. Loyall, David E. Bakken, Richard E. Schantz, John A. Zinky, David A. Karr, Rodrigo Vanegas, Kenneth R. Anderson
• Keywords: Distributed Object, LCR 1998, QoS Requirements, QuO's Aspect Languages, System Software